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Manako H, Ohsumi S, Sato YJ, Okazaki R, Aoki D. Large transverse thermoelectric effect induced by the mixed-dimensionality of Fermi surfaces. Nat Commun 2024; 15:3907. [PMID: 38724529 PMCID: PMC11081953 DOI: 10.1038/s41467-024-48217-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Accepted: 04/24/2024] [Indexed: 05/12/2024] Open
Abstract
Transverse thermoelectric effect, the conversion of longitudinal heat current into transverse electric current, or vice versa, offers a promising energy harvesting technology. Materials with axis-dependent conduction polarity, known as p × n-type conductors or goniopolar materials, are potential candidate, because the non-zero transverse elements of thermopower tensor appear under rotational operation, though the availability is highly limited. Here, we report that a ternary metal LaPt2B with unique crystal structure exhibits axis-dependent thermopower polarity, which is driven by mixed-dimensional Fermi surfaces consisting of quasi-one-dimensional hole sheet with out-of-plane velocity and quasi-two-dimensional electron sheets with in-plane velocity. The ideal mixed-dimensional conductor LaPt2B exhibits an extremely large transverse Peltier conductivity up to ∣αyx∣ = 130 A K-1 m-1, and its transverse thermoelectric performance surpasses those of topological magnets utilizing the anomalous Nernst effect. These results thus manifest the mixed-dimensionality as a key property for efficient transverse thermoelectric conversion.
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Affiliation(s)
- Hikari Manako
- Department of Physics and Astronomy, Tokyo University of Science, Noda, Japan
| | - Shoya Ohsumi
- Department of Physics and Astronomy, Tokyo University of Science, Noda, Japan
| | - Yoshiki J Sato
- Department of Physics and Astronomy, Tokyo University of Science, Noda, Japan.
- Graduate School of Science and Engineering, Saitama University, Saitama, Japan.
| | - R Okazaki
- Department of Physics and Astronomy, Tokyo University of Science, Noda, Japan
| | - D Aoki
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki, Japan
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2
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Helm T, Kimata M, Sudo K, Miyata A, Stirnat J, Förster T, Hornung J, König M, Sheikin I, Pourret A, Lapertot G, Aoki D, Knebel G, Wosnitza J, Brison JP. Field-induced compensation of magnetic exchange as the possible origin of reentrant superconductivity in UTe 2. Nat Commun 2024; 15:37. [PMID: 38167667 PMCID: PMC10761692 DOI: 10.1038/s41467-023-44183-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2022] [Accepted: 12/04/2023] [Indexed: 01/05/2024] Open
Abstract
The potential spin-triplet heavy-fermion superconductor UTe2 exhibits signatures of multiple distinct superconducting phases. For field aligned along the b axis, a metamagnetic transition occurs at μ0Hm ≈ 35 T. It is associated with magnetic fluctuations that may be beneficial for the field-reinforced superconductivity surviving up to Hm. Once the field is tilted away from the b towards the c axis, a reentrant superconducting phase emerges just above Hm. In order to better understand this remarkably field-resistant superconducting phase, we conducted magnetic-torque and magnetotransport measurements in pulsed magnetic fields. We determine the record-breaking upper critical field of μ0Hc2 ≈ 73 T and its evolution with angle. Furthermore, the normal-state Hall effect experiences a drastic suppression indicative of a reduced band polarization above Hm in the angular range around 30° caused by a partial compensation between the applied field and an exchange field. This promotes the Jaccarino-Peter effect as a likely mechanism for the reentrant superconductivity above Hm.
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Affiliation(s)
- Toni Helm
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany.
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
| | - Motoi Kimata
- Institute for Materials Research, Tohoku University, Sendai, Miyagi, 980-8577, Japan
| | - Kenta Sudo
- Institute for Materials Research, Tohoku University, Sendai, Miyagi, 980-8577, Japan
| | - Atsuhiko Miyata
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - Julia Stirnat
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062, Dresden, Germany
| | - Tobias Förster
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - Jacob Hornung
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062, Dresden, Germany
| | - Markus König
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
| | - Ilya Sheikin
- Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), CNRS, UGA, 38042, Grenoble, France
| | - Alexandre Pourret
- Univ. Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS, 38000, Grenoble, France
| | - Gerard Lapertot
- Univ. Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS, 38000, Grenoble, France
| | - Dai Aoki
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki, 311-1313, Japan
| | - Georg Knebel
- Univ. Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS, 38000, Grenoble, France
| | - Joachim Wosnitza
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062, Dresden, Germany
| | - Jean-Pascal Brison
- Univ. Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS, 38000, Grenoble, France
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3
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Tokunaga Y, Sakai H, Kambe S, Opletal P, Tokiwa Y, Haga Y, Kitagawa S, Ishida K, Aoki D, Knebel G, Lapertot G, Krämer S, Horvatić M. Longitudinal Spin Fluctuations Driving Field-Reinforced Superconductivity in UTe_{2}. Phys Rev Lett 2023; 131:226503. [PMID: 38101342 DOI: 10.1103/physrevlett.131.226503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 09/29/2023] [Accepted: 10/18/2023] [Indexed: 12/17/2023]
Abstract
Our measurements of ^{125}Te NMR relaxations reveal an enhancement of electronic spin fluctuations above μ_{0}H^{*}∼15 T, leading to their divergence in the vicinity of the metamagnetic transition at μ_{0}H_{m}≈35 T, below which field-reinforced superconductivity appears when a magnetic field (H) is applied along the crystallographic b axis. The NMR data evidence that these fluctuations are dominantly longitudinal, providing a key to understanding the peculiar superconducting phase diagram in H∥b, where such fluctuations enhance the pairing interactions.
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Affiliation(s)
- Y Tokunaga
- ASRC, Japan Atomic Energy Agency Tokai, Ibaraki 319-1195, Japan
| | - H Sakai
- ASRC, Japan Atomic Energy Agency Tokai, Ibaraki 319-1195, Japan
| | - S Kambe
- ASRC, Japan Atomic Energy Agency Tokai, Ibaraki 319-1195, Japan
| | - P Opletal
- ASRC, Japan Atomic Energy Agency Tokai, Ibaraki 319-1195, Japan
| | - Y Tokiwa
- ASRC, Japan Atomic Energy Agency Tokai, Ibaraki 319-1195, Japan
| | - Y Haga
- ASRC, Japan Atomic Energy Agency Tokai, Ibaraki 319-1195, Japan
| | - S Kitagawa
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - K Ishida
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - D Aoki
- IMR, Tohoku University, Ibaraki 311-1313, Japan
- Université Grenoble Alpes, CEA, Grenoble-INP, IRIG, Pheliqs, 38000 Grenoble, France
| | - G Knebel
- Université Grenoble Alpes, CEA, Grenoble-INP, IRIG, Pheliqs, 38000 Grenoble, France
| | - G Lapertot
- Université Grenoble Alpes, CEA, Grenoble-INP, IRIG, Pheliqs, 38000 Grenoble, France
| | - S Krämer
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, Université Grenoble Alpes, UPS and INSA Toulouse, Boîte Postale 166, 38042 Grenoble Cedex 9, France
| | - M Horvatić
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, Université Grenoble Alpes, UPS and INSA Toulouse, Boîte Postale 166, 38042 Grenoble Cedex 9, France
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4
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Yang Z, Fauqué B, Nomura T, Shitaokoshi T, Kim S, Chowdhury D, Pribulová Z, Kačmarčík J, Pourret A, Knebel G, Aoki D, Klein T, Maude DK, Marcenat C, Kohama Y. Unveiling the double-peak structure of quantum oscillations in the specific heat. Nat Commun 2023; 14:7006. [PMID: 37938579 PMCID: PMC10632398 DOI: 10.1038/s41467-023-42730-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Accepted: 10/16/2023] [Indexed: 11/09/2023] Open
Abstract
Quantum oscillation phenomenon is an essential tool to understand the electronic structure of quantum matter. Here we report a systematic study of quantum oscillations in the electronic specific heat Cel in natural graphite. We show that the crossing of a single spin Landau level and the Fermi energy give rise to a double-peak structure, in striking contrast to the single peak expected from Lifshitz-Kosevich theory. Intriguingly, the double-peak structure is predicted by the kernel term for Cel/T in the free electron theory. The Cel/T represents a spectroscopic tuning fork of width 4.8kBT which can be tuned at will to resonance. Using a coincidence method, the double-peak structure can be used to accurately determine the Landé g-factors of quantum materials. More generally, the tuning fork can be used to reveal any peak in fermionic density of states tuned by magnetic field, such as Lifshitz transition in heavy-fermion compounds.
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Affiliation(s)
- Zhuo Yang
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba, 277-8581, Japan.
| | - Benoît Fauqué
- JEIP, USR 3573 CNRS, Collège de France, PSL Research University, 11, Place Marcelin Berthelot, 75231, Paris Cedex 05, France
| | - Toshihiro Nomura
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
| | - Takashi Shitaokoshi
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
| | - Sunghoon Kim
- Department of Physics, Cornell University, Ithaca, NY, 14853, USA
| | | | - Zuzana Pribulová
- Centre of Low Temperature Physics, Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, SK-04001, Košice, Slovakia
| | - Jozef Kačmarčík
- Centre of Low Temperature Physics, Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, SK-04001, Košice, Slovakia
| | - Alexandre Pourret
- Univ. Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS, 38000, Grenoble, France
| | - Georg Knebel
- Univ. Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS, 38000, Grenoble, France
| | - Dai Aoki
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki, 311-1313, Japan
| | - Thierry Klein
- Univ. Grenoble Alpes, CNRS, Institut Néel, 38000, Grenoble, France
| | - Duncan K Maude
- Laboratoire National des Champs Magnétiques Intenses, CNRS-UGA-UPS-INSA, 143 avenue de Rangueil, 31400, Toulouse, France
| | - Christophe Marcenat
- Univ. Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS, 38000, Grenoble, France
| | - Yoshimitsu Kohama
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
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5
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Kinjo K, Fujibayashi H, Matsumura H, Hori F, Kitagawa S, Ishida K, Tokunaga Y, Sakai H, Kambe S, Nakamura A, Shimizu Y, Homma Y, Li D, Honda F, Aoki D. Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe 2. Sci Adv 2023; 9:eadg2736. [PMID: 37506206 PMCID: PMC10381943 DOI: 10.1126/sciadv.adg2736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Accepted: 06/23/2023] [Indexed: 07/30/2023]
Abstract
Superconducting (SC) state has spin and orbital degrees of freedom, and spin-triplet superconductivity shows multiple SC phases because of the presence of these degrees of freedom. However, the observation of spin-direction rotation occurring inside the SC state (SC spin rotation) has hardly been reported. Uranium ditelluride, a recently found topological superconductor, exhibits various SC phases under pressure: SC state at ambient pressure (SC1), high-temperature SC state above 0.5 gigapascal (SC2), and low-temperature SC state above 0.5 gigapascal (SC3). We performed nuclear magnetic resonance (NMR) and ac susceptibility measurements on a single-crystal uranium ditelluride. The b axis spin susceptibility remains unchanged in SC2, unlike in SC1, and decreases below the SC2-SC3 transition with spin modulation. These unique properties in SC3 arise from the coexistence of two SC order parameters. Our NMR results confirm spin-triplet superconductivity with SC spin parallel to b axis in SC2 and unveil the remaining of spin degrees of freedom in SC uranium ditelluride.
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Affiliation(s)
- Katsuki Kinjo
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Hiroki Fujibayashi
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Hiroki Matsumura
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Fumiya Hori
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Shunsaku Kitagawa
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Kenji Ishida
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Yo Tokunaga
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - Hironori Sakai
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - Shinsaku Kambe
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - Ai Nakamura
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - Yusei Shimizu
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - Yoshiya Homma
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - Dexin Li
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - Fuminori Honda
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
- Central Institute of Radioisotope Science and Safety, Kyushu University, Fukuoka 819-0395, Japan
| | - Dai Aoki
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
- University Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS, F-38000 Grenoble, France
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6
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Sakai H, Tokiwa Y, Opletal P, Kimata M, Awaji S, Sasaki T, Aoki D, Kambe S, Tokunaga Y, Haga Y. Field Induced Multiple Superconducting Phases in UTe_{2} along Hard Magnetic Axis. Phys Rev Lett 2023; 130:196002. [PMID: 37243663 DOI: 10.1103/physrevlett.130.196002] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 12/19/2022] [Accepted: 04/04/2023] [Indexed: 05/29/2023]
Abstract
The superconducting (SC) phase diagram in uranium ditelluride is explored under magnetic fields (H) along the hard magnetic b axis using a high-quality single crystal with T_{c}=2.1 K. Simultaneous electrical resistivity and ac magnetic susceptibility measurements discern low- and high-field SC (LFSC and HFSC, respectively) phases with contrasting field-angular dependence. Crystal quality increases the upper critical field of the LFSC phase, but the H^{*} of ∼15 T, at which the HFSC phase appears, is always the same through the various crystals. A phase boundary signature is also observed inside the LFSC phase near H^{*}, indicating an intermediate SC phase characterized by small flux pinning forces.
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Affiliation(s)
- H Sakai
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - Y Tokiwa
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - P Opletal
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - M Kimata
- Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan
| | - S Awaji
- High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - T Sasaki
- Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan
| | - D Aoki
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - S Kambe
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - Y Tokunaga
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - Y Haga
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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7
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Herrera E, Guillamón I, Barrena V, Herrera WJ, Galvis JA, Yeyati AL, Rusz J, Oppeneer PM, Knebel G, Brison JP, Flouquet J, Aoki D, Suderow H. Quantum-well states at the surface of a heavy-fermion superconductor. Nature 2023; 616:465-469. [PMID: 36949204 PMCID: PMC10115632 DOI: 10.1038/s41586-023-05830-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Accepted: 02/13/2023] [Indexed: 03/24/2023]
Abstract
Two-dimensional electronic states at surfaces are often observed in simple wide-band metals such as Cu or Ag (refs. 1-4). Confinement by closed geometries at the nanometre scale, such as surface terraces, leads to quantized energy levels formed from the surface band, in stark contrast to the continuous energy dependence of bulk electron bands2,5-10. Their energy-level separation is typically hundreds of meV (refs. 3,6,11). In a distinct class of materials, strong electronic correlations lead to so-called heavy fermions with a strongly reduced bandwidth and exotic bulk ground states12,13. Quantum-well states in two-dimensional heavy fermions (2DHFs) remain, however, notoriously difficult to observe because of their tiny energy separation. Here we use millikelvin scanning tunnelling microscopy (STM) to study atomically flat terraces on U-terminated surfaces of the heavy-fermion superconductor URu2Si2, which exhibits a mysterious hidden-order (HO) state below 17.5 K (ref. 14). We observe 2DHFs made of 5f electrons with an effective mass 17 times the free electron mass. The 2DHFs form quantized states separated by a fraction of a meV and their level width is set by the interaction with correlated bulk states. Edge states on steps between terraces appear along one of the two in-plane directions, suggesting electronic symmetry breaking at the surface. Our results propose a new route to realize quantum-well states in strongly correlated quantum materials and to explore how these connect to the electronic environment.
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Affiliation(s)
- Edwin Herrera
- Facultad de Ingeniería y Ciencias Básicas, Universidad Central, Bogotá, Colombia.
- Departamento de Física, Universidad Nacional de Colombia, Bogotá, Colombia.
- Laboratorio de Bajas Temperaturas y Altos Campos Magnéticos, Unidad Asociada UAM/CSIC, Departamento de Física de la Materia Condensada, Instituto Nicolás Cabrera and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Madrid, Spain.
| | - Isabel Guillamón
- Laboratorio de Bajas Temperaturas y Altos Campos Magnéticos, Unidad Asociada UAM/CSIC, Departamento de Física de la Materia Condensada, Instituto Nicolás Cabrera and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Madrid, Spain
| | - Víctor Barrena
- Laboratorio de Bajas Temperaturas y Altos Campos Magnéticos, Unidad Asociada UAM/CSIC, Departamento de Física de la Materia Condensada, Instituto Nicolás Cabrera and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Madrid, Spain
| | - William J Herrera
- Departamento de Física, Universidad Nacional de Colombia, Bogotá, Colombia
| | - Jose Augusto Galvis
- Facultad de Ingeniería y Ciencias Básicas, Universidad Central, Bogotá, Colombia
- School of Engineering, Science and Technology, Universidad del Rosario, Bogotá, Colombia
| | - Alfredo Levy Yeyati
- Departamento de Física Teórica de la Materia Condensada, Instituto Nicolás Cabrera and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Madrid, Spain
| | - Ján Rusz
- Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden
| | - Peter M Oppeneer
- Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden
| | - Georg Knebel
- University Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS, Grenoble, France
| | - Jean Pascal Brison
- University Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS, Grenoble, France
| | - Jacques Flouquet
- University Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS, Grenoble, France
| | - Dai Aoki
- Institute for Materials Research (IMR), Tohoku University, Oarai, Japan
| | - Hermann Suderow
- Laboratorio de Bajas Temperaturas y Altos Campos Magnéticos, Unidad Asociada UAM/CSIC, Departamento de Física de la Materia Condensada, Instituto Nicolás Cabrera and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Madrid, Spain.
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8
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Aoki D, Brison JP, Flouquet J, Ishida K, Knebel G, Tokunaga Y, Yanase Y. Unconventional superconductivity in UTe 2. J Phys Condens Matter 2022; 34:243002. [PMID: 35203074 DOI: 10.1088/1361-648x/ac5863] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 02/24/2022] [Indexed: 06/14/2023]
Abstract
The novel spin-triplet superconductor candidate UTe2was discovered only recently at the end of 2018 and already attracted enormous attention. We review key experimental and theoretical progress which has been achieved in different laboratories. UTe2is a heavy-fermion paramagnet, but following the discovery of superconductivity, it has been expected to be close to a ferromagnetic instability, showing many similarities to the U-based ferromagnetic superconductors, URhGe and UCoGe. This view might be too simplistic. The competition between different types of magnetic interactions and the duality between the local and itinerant character of the 5fUranium electrons, as well as the shift of the U valence appear as key parameters in the rich phase diagrams discovered recently under extreme conditions like low temperature, high magnetic field, and pressure. We discuss macroscopic and microscopic experiments at low temperature to clarify the normal phase properties at ambient pressure for field applied along the three axis of this orthorhombic structure. Special attention will be given to the occurrence of a metamagnetic transition atHm= 35 T for a magnetic field applied along the hard magnetic axisb. Adding external pressure leads to strong changes in the magnetic and electronic properties with a direct feedback on superconductivity. Attention is paid on the possible evolution of the Fermi surface as a function of magnetic field and pressure. Superconductivity in UTe2is extremely rich, exhibiting various unconventional behaviors which will be highlighted. It shows an exceptionally huge superconducting upper critical field with a re-entrant behavior under magnetic field and the occurrence of multiple superconducting phases in the temperature-field-pressure phase diagrams. There is evidence for spin-triplet pairing. Experimental indications exist for chiral superconductivity and spontaneous time reversal symmetry breaking in the superconducting state. Different theoretical approaches will be described. Notably we discuss that UTe2is a possible example for the realization of a fascinating topological superconductor. Exploring superconductivity in UTe2reemphasizes that U-based heavy fermion compounds give unique examples to study and understand the strong interplay between the normal and superconducting properties in strongly correlated electron systems.
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Affiliation(s)
- D Aoki
- IMR, Tohoku University, Oarai, Ibaraki, 311-1313, Japan
| | - J-P Brison
- Univ. Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS, F-38000 Grenoble, France
| | - J Flouquet
- Univ. Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS, F-38000 Grenoble, France
| | - K Ishida
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - G Knebel
- Univ. Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS, F-38000 Grenoble, France
| | - Y Tokunaga
- ASRC, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - Y Yanase
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
- Institute for Molecular Science, Okazaki 444-8585, Japan
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Nishisako S, Yamaguchi T, Hirayama M, Higa K, Aoki D, Sasaki C, Noma H, Shimazaki J. Donor-Related Risk Factors for Graft Decompensation Following Descemet's Stripping Automated Endothelial Keratoplasty. Front Med (Lausanne) 2022; 9:810536. [PMID: 35252249 PMCID: PMC8889573 DOI: 10.3389/fmed.2022.810536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Accepted: 01/11/2022] [Indexed: 11/13/2022] Open
Abstract
AimsTo identify donor-related risk factors associated with graft endothelial failure and postoperative endothelial cell density (ECD) reduction after Descemet's stripping automated endothelial keratoplasty (DSAEK).MethodsThis was a single-center retrospective study conducted from July 2006-December 2016. We included 584 consecutive eyes (482 patients) that underwent DSAEK for the treatment of laser iridotomy-related bullous keratopathy (192 eyes), pseudophakic bullous keratopathy (137 eyes), regraft (96 eyes), Fuchs' endothelial corneal dystrophy (FECD; 59 eyes) and others (100 eyes). Twenty-three donor- and recipient-related risk factors potentially associated with graft failure and ECD reduction were assessed using Cox hazard models and linear mixed effect models.ResultsThe median age of the patients was 73.5 years (male; 35.6%). After DSAEK, ECD decreased from 2,674 cells/mm2 (95% confidence interval [CI]; 2,646–2,701) to 1,132 (1,076–1,190) at 12 months and 904 (845–963) at 24 months (P < 0.001). Fifty-five eyes (9.4%) had graft endothelial failure without rejection. This failure was associated with donor pseudophakic lens status (hazard ratio [HR]; 2.67, CI; 1.50–4.76, P = 0.001) and preoperative endothelial folds (HR; 2.82, CI; 1.20–6.62, P = 0.02). The incidence of graft endothelial failure in non-FECD patients was significantly higher among those receiving donor grafts with a pseudophakic lens status and preoperative presence of endothelial folds (P < 0.001). Postoperative ECD loss was significantly greater in eyes with these risk factors compared to those without (P = 0.007).ConclusionsPseudophakic status and/or presence of preoperative endothelial folds are the significant donor risk factors for endothelial failure in non-FECD patients.
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Affiliation(s)
- Sota Nishisako
- Cornea Center and Eye Bank, Tokyo Dental College, Ichikawa General Hospital, Chiba, Japan
| | - Takefumi Yamaguchi
- Department of Ophthalmology, Tokyo Dental College, Ichikawa General Hospital, Chiba, Japan
| | - Masatoshi Hirayama
- Department of Ophthalmology, Tokyo Dental College, Ichikawa General Hospital, Chiba, Japan
| | - Kazunari Higa
- Cornea Center and Eye Bank, Tokyo Dental College, Ichikawa General Hospital, Chiba, Japan
| | - Dai Aoki
- Cornea Center and Eye Bank, Tokyo Dental College, Ichikawa General Hospital, Chiba, Japan
| | - Chiaki Sasaki
- Cornea Center and Eye Bank, Tokyo Dental College, Ichikawa General Hospital, Chiba, Japan
| | - Hisashi Noma
- Department of Data Science, The Institute of Statistical Mathematics, Tokyo, Japan
| | - Jun Shimazaki
- Cornea Center and Eye Bank, Tokyo Dental College, Ichikawa General Hospital, Chiba, Japan
- Department of Ophthalmology, Tokyo Dental College, Ichikawa General Hospital, Chiba, Japan
- *Correspondence: Jun Shimazaki
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Li DX, Shimizu Y, Nakamura A, Sato YJ, Maurya A, Homma Y, Honda F, Aoki D. Transition from spin glass to paramagnetism in the magnetic properties of PrAu 2Si 2. J Phys Condens Matter 2022; 34:135805. [PMID: 35008084 DOI: 10.1088/1361-648x/ac49c7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 01/10/2022] [Indexed: 06/14/2023]
Abstract
It is unexpected that a spin-glass (SG) transition, which generally occurs only in systems with some form of disorder, was observed in the ThCr2Si2-type compound PrAu2Si2at a temperature of ∼3 K. This puzzling phenomenon was later explained based on a novel dynamic frustration model that does not involve static disorder. We present the results of re-verification of the reported SG behaviors by measuring the physical properties of three polycrystalline PrAu2Si2samples annealed under different conditions. Indeed, in the sample annealed at 827 °C for one week, a SG transition does occur at a temperature ofTf∼ 2.8 K as that reported previously in the literature. However, it is newly found that the SG effect is actually more pronounced in the as-cast sample, and almost completely disappears in the well-annealed (at 850 °C for four weeks) sample. The annealing effect observed in PrAu2Si2, that is, SG to paramagnetism transition is discussed by comparing with earlier results reported on the same system and other isomorphic compounds.
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Affiliation(s)
- D X Li
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - Y Shimizu
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - A Nakamura
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - Y J Sato
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - A Maurya
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - Y Homma
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - F Honda
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
- Central Institute of Radioisotope Science and Safety, Kyushu University, Fukuoka 819-0395, Japan
| | - D Aoki
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
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Shimizu Y, Kono Y, Sugiyama T, Kittaka S, Shimura Y, Miyake A, Aoki D, Sakakibara T. Development of high-resolution capacitive Faraday magnetometers for sub-Kelvin region. Rev Sci Instrum 2021; 92:123908. [PMID: 34972457 DOI: 10.1063/5.0067759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 11/27/2021] [Indexed: 06/14/2023]
Abstract
High-sensitivity capacitive Faraday magnetometers were developed for static DC magnetization measurements in a sub-Kelvin region that can be used with 3He-4He dilution refrigerators (∼50 mK) and 3He refrigerators (∼0.28 K). For high-resolution magnetization measurements, the background magnetization of the force-sensing capacitor should be as small as possible, compared with the magnetization value of a measured specimen. In this study, we succeeded in reducing the background of the capacitor in both low- and high-field regions by compensating for the diamagnetic response of a thin quartz plate, making use of Pauli-paramagnetic alloys and Van Vleck paramagnets as a counter magnetization for a diamagnetic signal. Having established an ultra-high-sensitivity capacitor, we achieved a resolution of 10-5 (∼10-5-10-6) emu in the low- (high-) field region below (above) 1 T. In particular, the newly developed capacitors with a Van Vleck paramagnet Pr0.1La0.9Be13 and paramagnetic MgAl alloys are demonstrated to be very useful for high-resolution magnetization measurements at milli-Kelvin temperatures in low and high magnetic fields, respectively.
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Affiliation(s)
- Yusei Shimizu
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - Yohei Kono
- Department of Physics, Faculty of Science and Engineering, Chuo University, Bunkyo, Tokyo 112-8551, Japan
| | - Tomoyoshi Sugiyama
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Shunichiro Kittaka
- Department of Physics, Faculty of Science and Engineering, Chuo University, Bunkyo, Tokyo 112-8551, Japan
| | - Yasuyuki Shimura
- Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima 739-8530, Japan
| | - Atsushi Miyake
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Dai Aoki
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - Toshiro Sakakibara
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Aoki D, Kajiwara N, Irishio K, Kato Y, Suezaki S, Kageyama M, Misago M, Tamai D, Nakao S, Ueoka T, Ito M, Murakami S. Withdrawal of Glucocorticoid Therapy is Difficult in Women with Polymyalgia Rheumatica: An Observational Study. Int J Gen Med 2021; 14:6417-6422. [PMID: 34675610 PMCID: PMC8502034 DOI: 10.2147/ijgm.s322111] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 09/02/2021] [Indexed: 11/23/2022] Open
Abstract
Objective A total of 105 patients (64 women) who were started on glucocorticoid (GC) treatment for polymyalgia rheumatica (PMR) and/or remitting seronegative symmetrical synovitis with pitting edema (RS3PE) syndrome at Ikeda City Hospital from July 2004 to December 2019 were reviewed (PMR: 81, overlap: 20, pure RS3PE syndrome: 4). Then, 32 cases that had stopped GC and 17 cases that had continued GC for 7.5 years or longer were evaluated (women:men, stopped GC 12:20, continued GC 13:4, respectively) (PMR:overlap:pure RS3PE syndrome, stopped GC 26:6:0, continued GC 14:2:1, respectively). Methods The GC continuation rate in all patients was examined using the Kaplan-Meier method. The following were compared between the two groups: age at starting GC; sex; erythrocyte sedimentation rate, C-reactive protein, hemoglobin, ferritin, aspartate aminotransferase, and alanine aminotransferase before starting GC; days from the onset of symptoms to GC initiation; GC maximum dose; GC dose half a year after its start; presence of relapse; and existence of concomitant malignant disease. Results The GC continuation rate 7.5 years after GC initiation was 52.5%, higher in women (69.2%), than in men (27.1%). The rates then remained unchanged for 15 years. Hemoglobin was high, and relapse was uncommon in the group that stopped GC. There were no differences in other items. Conclusion It is difficult to stop GC therapy for PMR in women in Japan, especially in cases with severe anemia.
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Affiliation(s)
- Dai Aoki
- Department of Emergency and General Medicine, Ikeda City Hospital, Ikeda, Osaka, Japan.,Fukuchiyama City Hospital Ooe-Branch, Fukuchiyama, Kyoto, Japan
| | - Nobuyuki Kajiwara
- Department of Nephrology, Ikeda City Hospital, Ikeda, Osaka, Japan.,Toyono Town National Health Insurance Clinic, Toyono, Osaka, Japan
| | - Keiko Irishio
- Department of Clinical Research, Ikeda City Hospital, Ikeda, Osaka, Japan
| | - Yasuhiro Kato
- Department of Respiratory Medicine and Clinical Immunology, Graduate School of Medicine, Osaka University, Suita, Osaka, Japan
| | - Shinya Suezaki
- Department of Emergency and General Medicine, Ikeda City Hospital, Ikeda, Osaka, Japan
| | - Misaki Kageyama
- Department of Emergency and General Medicine, Ikeda City Hospital, Ikeda, Osaka, Japan
| | - Masahiro Misago
- Department of Emergency and General Medicine, Ikeda City Hospital, Ikeda, Osaka, Japan
| | | | - Shinichiro Nakao
- Department of Emergency and General Medicine, Ikeda City Hospital, Ikeda, Osaka, Japan
| | - Takato Ueoka
- Department of Emergency and General Medicine, Ikeda City Hospital, Ikeda, Osaka, Japan
| | - Mototoshi Ito
- Department of Emergency and General Medicine, Ikeda City Hospital, Ikeda, Osaka, Japan
| | - Shinichiro Murakami
- Department of Emergency and General Medicine, Ikeda City Hospital, Ikeda, Osaka, Japan.,Toyono Town National Health Insurance Clinic, Toyono, Osaka, Japan
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Mishra S, Hornung J, Raba M, Klotz J, Förster T, Harima H, Aoki D, Wosnitza J, McCollam A, Sheikin I. Robust Fermi-Surface Morphology of CeRhIn_{5} across the Putative Field-Induced Quantum Critical Point. Phys Rev Lett 2021; 126:016403. [PMID: 33480764 DOI: 10.1103/physrevlett.126.016403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 11/18/2020] [Accepted: 12/15/2020] [Indexed: 06/12/2023]
Abstract
We report a comprehensive de Haas-van Alphen (dHvA) study of the heavy-fermion material CeRhIn_{5} in magnetic fields up to 70 T. Several dHvA frequencies gradually emerge at high fields as a result of magnetic breakdown. Among them is the thermodynamically important β_{1} branch, which has not been observed so far. Comparison of our angle-dependent dHvA spectra with those of the non-4f compound LaRhIn_{5} and with band-structure calculations evidences that the Ce 4f electrons in CeRhIn_{5} remain localized over the whole field range. This rules out any significant Fermi-surface reconstruction, either at the suggested nematic phase transition at B^{*}≈30 T or at the putative quantum critical point at B_{c}≃50 T. Our results rather demonstrate the robustness of the Fermi surface and the localized nature of the 4f electrons inside and outside of the antiferromagnetic phase.
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Affiliation(s)
- S Mishra
- Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), CNRS, UGA, 38042 Grenoble, France
| | - J Hornung
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
- Institut für Festkörper- und Materialphysik, TU Dresden, 01062 Dresden, Germany
| | - M Raba
- Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), CNRS, UGA, 38042 Grenoble, France
| | - J Klotz
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - T Förster
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - H Harima
- Graduate School of Science, Kobe University, Kobe 657-8501, Japan
| | - D Aoki
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki, 311-1313, Japan
| | - J Wosnitza
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
- Institut für Festkörper- und Materialphysik, TU Dresden, 01062 Dresden, Germany
| | - A McCollam
- High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, The Netherlands
| | - I Sheikin
- Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), CNRS, UGA, 38042 Grenoble, France
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Yoshihara K, Enomoto T, Aoki D, Watanabe Y, Kigawa J, Takeshima N, Inomata H, Hattori K, Tsuda H, Sugiyama T. The first study evaluating the distribution of gBRCA1/2 variants within the ovarian cancer cluster region in Japanese ovarian cancer patients. Gynecol Oncol 2020. [DOI: 10.1016/j.ygyno.2020.05.632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Li DX, Shimizu Y, Nakamura A, Maurya A, Sato YJ, Homma Y, Honda F, Aoki D. Magnetic and transport properties of new ternary uranium-based germanide U 2Rh 3Ge 5. J Phys Condens Matter 2020; 32:495804. [PMID: 33006326 DOI: 10.1088/1361-648x/abb31a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A new ternary uranium germanide U2Rh3Ge5 has been successfully synthesized and investigated by means of magnetic susceptibility χ(T, H), isothermal magnetization M(T, H), electrical resistivity ρ(T), and specific heat C(T, H) measurements. This compound is found to crystallize in the U2Co3Si5-type orthorhombic structure. The low-field χ(T) shows a clear peak at T N = 41.5 K corresponding to an antiferromagnetic transition. The M(H) curve measured up to 70 kOe exhibits an H-linear behavior at 2 K with very small induced magnetic moments, while it shows upward curvature with increasing temperature, implying the possible presence of a metamagnetic transition in high-field region above 70 kOe. As the temperature decreases, ρ(T) increases slowly at T > T N and decreases rapidly at T < T N, which can be understood based on a semiconductor-like narrow band gap model (or the c-f hybridization effect) and an antiferromagnetic spin-wave model, respectively. No evidence of heavy-fermion behavior or superconductivity transition is observed at temperatures as low as 0.4 K. The obtained experimental results are discussed by comparing with those reported for the isomorphic compound U2Ir3Si5 and the quasi-isomorphic compound U2Rh3Si5.
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Affiliation(s)
- D X Li
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - Y Shimizu
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - A Nakamura
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - A Maurya
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - Y J Sato
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - Y Homma
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - F Honda
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - D Aoki
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
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Omatsu K, Hamanishi J, Katsumata N, Nishio S, Sawada K, Takeuchi S, Aoki D, Fujiwara K, Sugiyama T, Konishi I. 807O Nivolumab versus gemcitabine or pegylated liposomal doxorubicin for patients with platinum-resistant (advanced or recurrent) ovarian cancer: Open-label, randomized trial in Japan (NINJA trial). Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.08.946] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Wang L, He M, Hardy F, Aoki D, Willa K, Flouquet J, Meingast C. Electronic Nematicity in URu_{2}Si_{2} Revisited. Phys Rev Lett 2020; 124:257601. [PMID: 32639769 DOI: 10.1103/physrevlett.124.257601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Accepted: 05/27/2020] [Indexed: 06/11/2023]
Abstract
The nature of the hidden-order (HO) state in URu_{2}Si_{2} remains one of the major unsolved issues in heavy-fermion physics. Recently, torque magnetometry, x-ray diffraction, and elastoresistivity data have suggested that the HO phase transition at T_{HO}≈ 17.5 K is driven by electronic nematic effects. Here, we search for thermodynamic signatures of this purported structural instability using anisotropic thermal expansion, Young's modulus, elastoresistivity, and specific-heat measurements. In contrast to the published results, we find no evidence of a rotational symmetry breaking in any of our data. Interestingly, our elastoresistivity measurements, which are in full agreement with published results, exhibit a Curie-Weiss divergence, which we however attribute to a volume and not to a symmetry-breaking effect. Finally, clear evidence for thermal fluctuations is observed in our heat-capacity data, from which we estimate the HO correlation length.
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Affiliation(s)
- Liran Wang
- Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
| | - Mingquan He
- Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
| | - Frédéric Hardy
- Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
| | - Dai Aoki
- Université Grenoble Alpes, CEA, PHELIQS, 38000 Grenoble, France
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - Kristin Willa
- Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
| | | | - Christoph Meingast
- Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
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Niu Q, Knebel G, Braithwaite D, Aoki D, Lapertot G, Seyfarth G, Brison JP, Flouquet J, Pourret A. Fermi-Surface Instability in the Heavy-Fermion Superconductor UTe_{2}. Phys Rev Lett 2020; 124:086601. [PMID: 32167364 DOI: 10.1103/physrevlett.124.086601] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 10/30/2019] [Accepted: 01/15/2020] [Indexed: 06/10/2023]
Abstract
Transport measurements are presented up to fields of 29 T in the recently discovered heavy-fermion superconductor UTe_{2} with magnetic field H applied along the easy magnetization a axis of the body-centered orthorhombic structure. The thermoelectric power varies linearly with temperature above the superconducting transition, T_{SC}=1.5 K, indicating that superconductivity develops in a Fermi liquid regime. As a function of field the thermoelectric power shows successive anomalies which appear at critical values of the magnetic polarization. Remarkably, the lowest magnetic field instability for H∥a occurs for the same critical value of the magnetization (0.4 μ_{B}) than the first order metamagnetic transition at 35 T for field applied along the b axis. It can be clearly identified as a Lifshitz transition. The estimated number of charge carriers at low temperature reveals a metallic ground state distinct from LDA calculations indicating that strong electronic correlations are a major issue.
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Affiliation(s)
- Q Niu
- Université Grenoble Alpes, CEA, IRIG, PHELIQS, F-38000 Grenoble, France
| | - G Knebel
- Université Grenoble Alpes, CEA, IRIG, PHELIQS, F-38000 Grenoble, France
| | - D Braithwaite
- Université Grenoble Alpes, CEA, IRIG, PHELIQS, F-38000 Grenoble, France
| | - D Aoki
- Université Grenoble Alpes, CEA, IRIG, PHELIQS, F-38000 Grenoble, France
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - G Lapertot
- Université Grenoble Alpes, CEA, IRIG, PHELIQS, F-38000 Grenoble, France
| | - G Seyfarth
- Université Grenoble Alpes, EMFL, CNRS, Laboratoire National des Champs Magnétiques Intenses (LNCMI), 38042 Grenoble, France
| | - J-P Brison
- Université Grenoble Alpes, CEA, IRIG, PHELIQS, F-38000 Grenoble, France
| | - J Flouquet
- Université Grenoble Alpes, CEA, IRIG, PHELIQS, F-38000 Grenoble, France
| | - A Pourret
- Université Grenoble Alpes, CEA, IRIG, PHELIQS, F-38000 Grenoble, France
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Bhattacharyya A, Adroja DT, Biswas PK, Sato YJ, Lees MR, Aoki D, Hillier AD. Ir 5d-band derived superconductivity in LaIr 3. J Phys Condens Matter 2020; 32:065602. [PMID: 31509814 DOI: 10.1088/1361-648x/ab4389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The superconducting properties of rhombohedral LaIr3 were examined using susceptibility, resistivity, heat capacity, and zero-field (ZF) and transverse-field (TF) muon spin relaxation and rotation ([Formula: see text]SR) measurements. The susceptibility and resistivity measurements confirm a superconducting transition below [Formula: see text] K. Two successive transitions are observed in the heat capacity data, one at [Formula: see text] K and a second at 1.2 K below [Formula: see text]. The heat capacity jump is [Formula: see text], which is lower than 1.43 expected for Bardeen-Cooper-Schrieffer (BCS) weak-coupling limit. TF-[Formula: see text]SR measurements reveal a fully gapped s-wave superconductivity with [Formula: see text], which is small compared to the BCS value of 3.56, suggesting weak-coupling superconductivity. The magnetic penetration depth, [Formula: see text], estimated from TF-[Formula: see text]SR gives [Formula: see text] nm, a superconducting carrier density [Formula: see text] carriers m-3 and a carrier effective-mass enhancement factor [Formula: see text]. ZF-[Formula: see text]SR data show no evidence for any spontaneous magnetic fields below [Formula: see text], which demonstrates that time-reversal symmetry is preserved in the superconducting state of LaIr3.
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Affiliation(s)
- A Bhattacharyya
- Department of Physics, Ramakrishna Mission Vivekananda Educational and Research Institute, Belur Math, Howrah 711202, West Bengal, India
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Yunokawa M, Takahashi S, Aoki D, Yonemori K, Hara H, Hasegawa K, Takehara K, Harano K, Nomura H, Noguchi E, Horie K, Ogasawara A, Okame S, Doi T. First-in-human phase I study of TAS-117, an allosteric AKT inhibitor, in patients with advanced solid tumours. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz244.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Arimoto T, Takahiro K, Toita T, Kobayashi H, Machida R, Mizutani T, Onda T, Mizuno M, Yokota H, Kamiura S, Takehara K, Takano H, Saito T, Mandai M, Satoh T, Yamaguchi S, Nakamura T, Ushijima K, Aoki D, Yaegashi N. Spread of tumour and adverse events after modified radical hysterectomy for FIGO Stage IB1 cervical cancer patients with tumour diameter preoperatively estimated 2 cm or less: Japan Clinical Oncology Group trial (JCOG1101); exploratory analysis before primary analysis. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz250.057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Yoshihara K, Enomoto T, Aoki D, Watanabe Y, Kigawa J, Takeshima N, Fujikawa K, Hattori K, Tsuda H, Sugiyama T. The first nationwide Japanese multicenter study: Characterizing the cross-sectional approach to ovarian cancer genetic testing of (CHARLOTTE). Gynecol Oncol 2019. [DOI: 10.1016/j.ygyno.2019.04.074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Iijima M, Okonogi N, Banno K, Tsuji K, Kobayashi Y, Tominaga E, Hasegawa S, Aoki D. Postirradiation PD-L1 expression is a predictor of an improved prognosis after carbon ion radiotherapy for uterine cervical adenocarcinoma. Gynecol Oncol 2019. [DOI: 10.1016/j.ygyno.2019.04.112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Shimizu Y, Braithwaite D, Aoki D, Salce B, Brison JP. Spin-Triplet p-Wave Superconductivity Revealed under High Pressure in UBe_{13}. Phys Rev Lett 2019; 122:067001. [PMID: 30822059 DOI: 10.1103/physrevlett.122.067001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2018] [Revised: 06/20/2018] [Indexed: 06/09/2023]
Abstract
To unravel the nature of the superconducting symmetry of the enigmatic 5f heavy-fermion UBe_{13}, the pressure dependence of the upper critical field and of the normal state are studied up to 10 GPa. Remarkably, the pressure evolution of the anomalous H_{c2}(T,P) over the entire pressure range up to 5.9 GPa can be successfully explained by the gradual admixture of a field-pressure-induced E_{u} component in an A_{1u} spin-triplet ground state. This result provides strong evidence for parallel-spin pairing in UBe_{13}, which is also supported by the recently observed fully gapped excitation spectrum at ambient pressure. Moreover, we have also found a novel non-Fermi-liquid behavior of the resistivity, ρ(T)∼T^{n} (n≲1), which disappears with the collapse of the negative magnetoresistance behavior and the existence of a superconducting ground state around P=6 GPa, suggesting a close interplay between Kondo scattering and superconductivity.
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Affiliation(s)
- Yusei Shimizu
- Université Grenoble Alpes, INAC/PHELIQS, CEA-Grenoble, F-38000 Grenoble, France
| | - Daniel Braithwaite
- Université Grenoble Alpes, INAC/PHELIQS, CEA-Grenoble, F-38000 Grenoble, France
| | - Dai Aoki
- Université Grenoble Alpes, INAC/PHELIQS, CEA-Grenoble, F-38000 Grenoble, France
- Institute for Materials Research (IMR), Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - Bernard Salce
- Université Grenoble Alpes, INAC/PHELIQS, CEA-Grenoble, F-38000 Grenoble, France
| | - Jean-Pascal Brison
- Université Grenoble Alpes, INAC/PHELIQS, CEA-Grenoble, F-38000 Grenoble, France
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Nishisako S, Aoki D, Sasaki C, Higa K, Shimazaki J. Comparison of Artificial Anterior Chamber Internal Pressures and Cutting Systems for Descemet's Stripping Automated Endothelial Keratoplasty. Transl Vis Sci Technol 2018; 7:11. [PMID: 30510855 PMCID: PMC6262888 DOI: 10.1167/tvst.7.6.11] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 09/23/2018] [Indexed: 01/24/2023] Open
Abstract
Purpose To optimize methods of preparing donor cornea tissue for Descemet's stripping automated endothelial keratoplasty (DSAEK), we compared five experimental conditions with different internal pressures and cutting systems. Methods The artificial anterior chamber internal pressure (IP) was set at 100 or 200 mm Hg. The microkeratome cut was performed with or without an artificial chamber pressurizer (ACP), using a CBm turbine (CBm) or one use-plus automated (OUP-A). Thirty human research corneas were divided into five groups, and compared after the cut with donor tissue quality parameters, including cutting depth, graft uniformity, cell evaluation, and smoothness of the stromal surface. Results The smallest variation in mean cut depth was observed in the condition, which had IP of 200 mm Hg used ACP and OUP-A. In experimental groups cut using CBm, significantly more consistent thicknesses were made at an IP of 200 than 100 mm Hg. There were no statistically significant differences among the groups in either endothelial cell density or cell viable assay results after cuts. Using an IP of 200 mm Hg with ACP and CBm produced the roughest stromal surface, and the roughness grading scores showed a positive correlation with the percentage of cut depth. Conclusions An IP of 200 mm Hg was the best setting for DSAEK grafts with high predictability of cut depth and uniformity of graft thickness without endothelial cell damage. Translational Relevance For successful DSAEK, it is recommended that a set internal pressure of 200 mm Hg be used during microkeratome cutting for donor tissue preparation.
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Affiliation(s)
- Sota Nishisako
- Cornea Center and Eye Bank, Tokyo Dental College, Ichikawa General Hospital, Chiba, Japan
| | - Dai Aoki
- Cornea Center and Eye Bank, Tokyo Dental College, Ichikawa General Hospital, Chiba, Japan
| | - Chiaki Sasaki
- Cornea Center and Eye Bank, Tokyo Dental College, Ichikawa General Hospital, Chiba, Japan
| | - Kazunari Higa
- Cornea Center and Eye Bank, Tokyo Dental College, Ichikawa General Hospital, Chiba, Japan
| | - Jun Shimazaki
- Cornea Center and Eye Bank, Tokyo Dental College, Ichikawa General Hospital, Chiba, Japan
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Kisu I, Banno K, Matoba Y, Adachi M, Aoki D. Current Status of Uterus Transplantation and Approaches for Future Clinical Application in Japan. Transplant Proc 2018; 50:2783-2788. [DOI: 10.1016/j.transproceed.2018.02.198] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2018] [Accepted: 02/26/2018] [Indexed: 01/28/2023]
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Affiliation(s)
- I Kisu
- Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
| | - Y Kato
- Department of Surgery, Kidney Center, Tokyo Women's Medical University, Tokyo, Japan
| | - H Obara
- Department of Surgery, Keio University School of Medicine, Tokyo, Japan
| | - K Matsubara
- Department of Surgery, Keio University School of Medicine, Tokyo, Japan
| | - Y Matoba
- Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
| | - K Banno
- Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
| | - D Aoki
- Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
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Bookman MA, Okamoto A, Stuart G, Yanaihara N, Aoki D, Bacon M, Fujiwara K, González-Martín A, Harter P, Kim JW, Ledermann J, Pujade-Lauraine E, Quinn M, Ochiai K. Harmonising clinical trials within the Gynecologic Cancer InterGroup: consensus and unmet needs from the Fifth Ovarian Cancer Consensus Conference. Ann Oncol 2018; 28:viii30-viii35. [PMID: 29232472 DOI: 10.1093/annonc/mdx449] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The Gynecologic Cancer InterGroup (GCIG) Fifth Ovarian Cancer Consensus Conference (OCCC) was held in Tokyo, Japan from 7 to 9 November 2015. It provided international consensus on 15 important questions in 4 topic areas, which were generated in accordance with the mission statement to establish 'International Consensus for Designing Better Clinical Trials'. The methodology for obtaining consensus was previously established and followed during the Fifth OCCC. All 29 clinical trial groups of GCIG participated in program development and deliberations. Draft consensus statements were discussed in topic groups as well as in a plenary forum. The final statements were then presented to all 29 member groups for voting and documentation of the level of consensus. Full consensus was obtained for 11 of the 15 statements with 28/29 groups agreeing to 3 statements, and 27/29 groups agreeing to 1 statement. The high acceptance rate of the statements among trial groups reflects the fact that we share common questions, and recognise important unmet needs that will guide future research in ovarian cancer.
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Braithwaite D, Aoki D, Brison JP, Flouquet J, Knebel G, Nakamura A, Pourret A. Dimensionality Driven Enhancement of Ferromagnetic Superconductivity in URhGe. Phys Rev Lett 2018; 120:037001. [PMID: 29400517 DOI: 10.1103/physrevlett.120.037001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Indexed: 06/07/2023]
Abstract
In most unconventional superconductors, like the high-T_{c} cuprates, iron pnictides, or heavy-fermion systems, superconductivity emerges in the proximity of an electronic instability. Identifying unambiguously the pairing mechanism remains nevertheless an enormous challenge. Among these systems, the orthorhombic uranium ferromagnetic superconductors have a unique position, notably because magnetic fields couple directly to ferromagnetic order, leading to the fascinating discovery of the reemergence of superconductivity in URhGe at a high field. Here we show that uniaxial stress is a remarkable tool allowing the fine-tuning of the pairing strength. With a relatively small stress, the superconducting phase diagram is spectacularly modified, with a merging of the low- and high-field superconducting states and a significant enhancement of the superconductivity. The superconducting critical temperature increases both at zero field and under a field, reaching 1 K, more than twice higher than at ambient pressure. This enhancement of superconductivity is shown to be directly related to a change of the magnetic dimensionality detected from an increase of the transverse magnetic susceptibility: In addition to the Ising-type longitudinal ferromagnetic fluctuations, transverse magnetic fluctuations also play an important role in the superconducting pairing.
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Affiliation(s)
| | - Dai Aoki
- Université Grenoble Alpes, CEA, INAC-PHELIQS, 38000 Grenoble, France
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | | | - Jacques Flouquet
- Université Grenoble Alpes, CEA, INAC-PHELIQS, 38000 Grenoble, France
| | - Georg Knebel
- Université Grenoble Alpes, CEA, INAC-PHELIQS, 38000 Grenoble, France
| | - Ai Nakamura
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - Alexandre Pourret
- Université Grenoble Alpes, CEA, INAC-PHELIQS, 38000 Grenoble, France
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Sugiyama T, Aoki D, Enomoto T, Takeshima N, Watanabe Y, Fujikawa K, Jinnai T, Kigawa J. Japan CHARLOTTE: Characterizing the cross-sectional approach to ovarian cancer: Genetic testing of BRCA. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx372.055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Kasuga Y, Miyakoshi K, Nishio H, Akiba Y, Otani T, Fukutake M, Ikenoue S, Ochiai D, Matsumoto T, Tanaka K, Minegishi K, Kuji N, Roberts R, Aoki D, Tanaka M. Mid-trimester residual cervical length and the risk of preterm birth in pregnancies after abdominal radical trachelectomy: a retrospective analysis. BJOG 2017; 124:1729-1735. [PMID: 28418597 DOI: 10.1111/1471-0528.14688] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/09/2017] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To investigate the association between mid-trimester residual cervical length (CL) and the risk of preterm birth in pregnancies after abdominal radical trachelectomy (RT). DESIGN Retrospective cohort study. SETTING University hospital. POPULATION A total of 33 deliveries after 22 weeks' gestation in 30 women who underwent abdominal RT including prophylactic cervical cerclage and perinatal care between January 2002 and May 2016. METHODS The association between mid-trimester residual CL (the distance between the cerclage and the external cervical os) and gestational age at delivery was investigated. Receiver-operating characteristics (ROC) curve analysis was performed to estimate the optimal cut-off values of the mid-trimester residual CL for the prediction of preterm birth. MAIN OUTCOME MEASURES Preterm birth before 34 weeks' gestation. RESULTS Mid-trimester residual CL showed a significant correlation with gestational age at delivery (r = 0.36, P < 0.05). There was a significant difference in residual CL between women who did and those who did not give birth before 34 weeks (P < 0.05). Mid-trimester residual CL < 13 mm was a good predictor of birth before 34 weeks, with a sensitivity of 67%, specificity of 75%, positive predictive value of 55% and negative predictive value of 86% (area under ROC curve, 0.75). CONCLUSIONS Mid-trimester residual CL is significantly correlated with gestational age at delivery. Residual CL assessment could be used to reassure physicians and women that there is only a small chance of preterm birth in pregnancies after abdominal RT. TWEETABLE ABSTRACT Mid-trimester residual cervical length is a good predictor of preterm birth after radical trachelectomy.
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Affiliation(s)
- Y Kasuga
- Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
| | - K Miyakoshi
- Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
| | - H Nishio
- Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
| | - Y Akiba
- Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
| | - T Otani
- Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
| | - M Fukutake
- Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
| | - S Ikenoue
- Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
| | - D Ochiai
- Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
| | - T Matsumoto
- Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
| | - K Tanaka
- Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
| | | | - N Kuji
- Department of Obstetrics and Gynecology, Tokyo Medical University, Tokyo, Japan
| | - R Roberts
- Center for Clinical Research, Keio University School of Medicine, Tokyo, Japan
| | - D Aoki
- Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
| | - M Tanaka
- Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
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Wilson MK, Pujade-Lauraine E, Aoki D, Mirza MR, Lorusso D, Oza AM, du Bois A, Vergote I, Reuss A, Bacon M, Friedlander M, Gallardo-Rincon D, Joly F, Chang SJ, Ferrero AM, Edmondson RJ, Wimberger P, Maenpaa J, Gaffney D, Zang R, Okamoto A, Stuart G, Ochiai K. Fifth Ovarian Cancer Consensus Conference of the Gynecologic Cancer InterGroup: recurrent disease. Ann Oncol 2017; 28:727-732. [PMID: 27993805 DOI: 10.1093/annonc/mdw663] [Citation(s) in RCA: 169] [Impact Index Per Article: 24.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 11/23/2016] [Indexed: 12/19/2022] Open
Abstract
This manuscript reports the consensus statements regarding recurrent ovarian cancer (ROC), reached at the fifth Ovarian Cancer Consensus Conference (OCCC), which was held in Tokyo, Japan, in November 2015. Three important questions were identified: (i) What are the subgroups for clinical trials in ROC? The historical definition of using platinum-free interval (PFI) to categorise patients as having platinum-sensitive/resistant disease was replaced by therapy-free interval (TFI). TFI can be broken down into TFIp (PFI), TFInp (non-PFI) and TFIb (biological agent-free interval). Additional criteria to consider include histology, BRCA mutation status, number/type of previous therapies, outcome of prior surgery and patient reported symptoms. (ii) What are the control arms for clinical trials in ROC? When platinum is considered the best option, the control arm should be a platinum-based therapy with or without an anti-angiogenic agent or a poly (ADP-ribose) polymerase (PARP) inhibitor. If platinum is not considered the best option, the control arm could include a non-platinum drug, either as single agent or in combination. (iii) What are the endpoints for clinical trials in ROC? Overall survival (OS) is the preferred endpoint for patient cohorts with an expected median OS < or = 12 months. Progression-free survival (PFS) is an alternative, and it is the preferred endpoint when the expected median OS is > 12 months. However, PFS alone should not be the only endpoint and must be supported by additional endpoints including pre-defined patient reported outcomes (PROs), time to second subsequent therapy (TSST), or time until definitive deterioration of quality of life (TUDD).
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Mazzone DG, Raymond S, Gavilano JL, Ressouche E, Niedermayer C, Birk JO, Ouladdiaf B, Bastien G, Knebel G, Aoki D, Lapertot G, Kenzelmann M. Field-induced magnetic instability within a superconducting condensate. Sci Adv 2017; 3:e1602055. [PMID: 28560326 PMCID: PMC5438216 DOI: 10.1126/sciadv.1602055] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Accepted: 03/20/2017] [Indexed: 06/07/2023]
Abstract
The application of magnetic fields, chemical substitution, or hydrostatic pressure to strongly correlated electron materials can stabilize electronic phases with different organizational principles. We present evidence for a field-induced quantum phase transition, in superconducting Nd0.05Ce0.95CoIn5, that separates two antiferromagnetic phases with identical magnetic symmetry. At zero field, we find a spin-density wave that is suppressed at the critical field μ0H* = 8 T. For H > H*, a spin-density phase emerges and shares many properties with the Q phase in CeCoIn5. These results suggest that the magnetic instability is not magnetically driven, and we propose that it is driven by a modification of superconducting condensate at H*.
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Affiliation(s)
- Daniel Gabriel Mazzone
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Stéphane Raymond
- Institute for Nanosciences and Cryogenics, Commissariat à l’Energie Atomique et aux Energies Alternatives, Université Grenoble Alpes, 38054 Grenoble, France
| | - Jorge Luis Gavilano
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Eric Ressouche
- Institute for Nanosciences and Cryogenics, Commissariat à l’Energie Atomique et aux Energies Alternatives, Université Grenoble Alpes, 38054 Grenoble, France
| | - Christof Niedermayer
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Jonas Okkels Birk
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
- Department of Physics, Technical University of Denmark (DTU), DK-2800 Kongens Lyngby, Denmark
| | | | - Gaël Bastien
- Institute for Nanosciences and Cryogenics, Commissariat à l’Energie Atomique et aux Energies Alternatives, Université Grenoble Alpes, 38054 Grenoble, France
| | - Georg Knebel
- Institute for Nanosciences and Cryogenics, Commissariat à l’Energie Atomique et aux Energies Alternatives, Université Grenoble Alpes, 38054 Grenoble, France
| | - Dai Aoki
- Institute for Nanosciences and Cryogenics, Commissariat à l’Energie Atomique et aux Energies Alternatives, Université Grenoble Alpes, 38054 Grenoble, France
| | - Gérard Lapertot
- Institute for Nanosciences and Cryogenics, Commissariat à l’Energie Atomique et aux Energies Alternatives, Université Grenoble Alpes, 38054 Grenoble, France
| | - Michel Kenzelmann
- Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
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Wu B, Bastien G, Taupin M, Paulsen C, Howald L, Aoki D, Brison JP. Pairing mechanism in the ferromagnetic superconductor UCoGe. Nat Commun 2017; 8:14480. [PMID: 28230099 PMCID: PMC5473642 DOI: 10.1038/ncomms14480] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Accepted: 01/03/2017] [Indexed: 11/09/2022] Open
Abstract
Superconductivity is a unique manifestation of quantum mechanics on a macroscopic scale, and one of the rare examples of many-body phenomena that can be explained by predictive, quantitative theories. The superconducting ground state is described as a condensate of Cooper pairs, and a major challenge has been to understand which mechanisms could lead to a bound state between two electrons, despite the large Coulomb repulsion. An even bigger challenge is to identify experimentally this pairing mechanism, notably in unconventional superconductors dominated by strong electronic correlations, like in high-Tc cuprates, iron pnictides or heavy-fermion compounds. Here we show that in the ferromagnetic superconductor UCoGe, the field dependence of the pairing strength influences dramatically its macroscopic properties like the superconducting upper critical field, in a way that can be quantitatively understood. This provides a simple demonstration of the dominant role of ferromagnetic spin fluctuations in the pairing mechanism.
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Affiliation(s)
- Beilun Wu
- Université Grenoble Alpes, CEA, INAC-PHELIQS, F-38000 Grenoble, France
| | - Gaël Bastien
- Université Grenoble Alpes, CEA, INAC-PHELIQS, F-38000 Grenoble, France
| | - Mathieu Taupin
- Université Grenoble Alpes, CEA, INAC-PHELIQS, F-38000 Grenoble, France.,Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, Vienna 1040, Austria
| | - Carley Paulsen
- Université Grenoble Alpes, CNRS, F-38000 Grenoble, France
| | - Ludovic Howald
- Université Grenoble Alpes, CEA, INAC-PHELIQS, F-38000 Grenoble, France.,Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Dai Aoki
- Université Grenoble Alpes, CEA, INAC-PHELIQS, F-38000 Grenoble, France.,Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
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Sawada J, Aoki D, Kuzume M, Nakazono K, Otsuka H, Takata T. A vinylic rotaxane cross-linker for toughened network polymers from the radical polymerization of vinyl monomers. Polym Chem 2017. [DOI: 10.1039/c7py00193b] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A [2]rotaxane cross-linker with one vinyl group in each component was synthesized as a vinylic cross-linker for highly toughened network polymers.
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Affiliation(s)
- J. Sawada
- Department of Chemical Science and Engineering
- Tokyo Institute of Technology
- Meguro-ku
- Japan
| | - D. Aoki
- Department of Chemical Science and Engineering
- Tokyo Institute of Technology
- Meguro-ku
- Japan
| | - M. Kuzume
- Department of Chemical Science and Engineering
- Tokyo Institute of Technology
- Meguro-ku
- Japan
| | - K. Nakazono
- Department of Chemical Science and Engineering
- Tokyo Institute of Technology
- Meguro-ku
- Japan
| | - H. Otsuka
- Department of Chemical Science and Engineering
- Tokyo Institute of Technology
- Meguro-ku
- Japan
| | - T. Takata
- Department of Chemical Science and Engineering
- Tokyo Institute of Technology
- Meguro-ku
- Japan
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Bastien G, Gourgout A, Aoki D, Pourret A, Sheikin I, Seyfarth G, Flouquet J, Knebel G. Lifshitz Transitions in the Ferromagnetic Superconductor UCoGe. Phys Rev Lett 2016; 117:206401. [PMID: 27886473 DOI: 10.1103/physrevlett.117.206401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Indexed: 06/06/2023]
Abstract
We present high field magnetoresistance, Hall effect and thermopower measurements in the Ising-type ferromagnetic superconductor UCoGe. A magnetic field is applied along the easy magnetization c axis of the orthorhombic crystal. In the different experimental probes, we observed five successive anomalies at H≈4, 9, 12, 16, and 21 T. Magnetic quantum oscillations were detected both in resistivity and thermoelectric power. At most of the anomalies, significant changes of the oscillation frequencies and the effective masses have been observed, indicating successive Fermi surface instabilities induced by the strong magnetic polarization under a magnetic field.
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Affiliation(s)
- Gaël Bastien
- University Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France
- CEA, INAC-PHELIQS, F-38000 Grenoble, France
| | - Adrien Gourgout
- University Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France
- CEA, INAC-PHELIQS, F-38000 Grenoble, France
| | - Dai Aoki
- University Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France
- CEA, INAC-PHELIQS, F-38000 Grenoble, France
- IMR, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - Alexandre Pourret
- University Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France
- CEA, INAC-PHELIQS, F-38000 Grenoble, France
| | - Ilya Sheikin
- CNRS, Laboratoire National des Champs Magnétiques Intenses LNCMI (UGA, UPS, INSA), UPR 3228, F-38042 Grenoble Cedex 9, France
| | - Gabriel Seyfarth
- CNRS, Laboratoire National des Champs Magnétiques Intenses LNCMI (UGA, UPS, INSA), UPR 3228, F-38042 Grenoble Cedex 9, France
| | - Jacques Flouquet
- University Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France
- CEA, INAC-PHELIQS, F-38000 Grenoble, France
| | - Georg Knebel
- University Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France
- CEA, INAC-PHELIQS, F-38000 Grenoble, France
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Hirose Y, Doto H, Honda F, Li D, Aoki D, Haga Y, Settai R. New heavy-fermion antiferromagnet UPd2Cd20. J Phys Condens Matter 2016; 28:425601. [PMID: 27541709 DOI: 10.1088/0953-8984/28/42/425601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We succeeded in growing a new high quality single crystal of a ternary uranium compound UPd2Cd20. From the electrical resistivity, magnetization, magnetic susceptibility, and specific heat experiments, UPd2Cd20 is found to be an antiferromagnetic heavy-fermion compound with the Néel temperature [Formula: see text] = 5 K and exhibits the large electronic specific heat coefficient γ exceeding 500 mJ (K(2)· mol)(-1). This compound is the first one that exhibits the magnetic ordering with the magnetic moments of the U atom in a series of UT2X20 (T: transition metal, X = Al, Zn, Cd). UPd2Cd20 shows typical characteristic features in heavy-fermion systems such as a broad maximum in the magnetic susceptibility at [Formula: see text] and a large coefficient A of T (2) term in the resistivity.
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Affiliation(s)
- Yusuke Hirose
- Department of Physics, Niigata University, Niigata 950-2181, Japan
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Knafo W, Duc F, Bourdarot F, Kuwahara K, Nojiri H, Aoki D, Billette J, Frings P, Tonon X, Lelièvre-Berna E, Flouquet J, Regnault LP. Field-induced spin-density wave beyond hidden order in URu 2Si 2. Nat Commun 2016; 7:13075. [PMID: 27762260 PMCID: PMC5080431 DOI: 10.1038/ncomms13075] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2016] [Accepted: 08/31/2016] [Indexed: 11/09/2022] Open
Abstract
URu2Si2 is one of the most enigmatic strongly correlated electron systems and offers a fertile testing ground for new concepts in condensed matter science. In spite of >30 years of intense research, no consensus on the order parameter of its low-temperature hidden-order phase exists. A strong magnetic field transforms the hidden order into magnetically ordered phases, whose order parameter has also been defying experimental observation. Here, thanks to neutron diffraction under pulsed magnetic fields up to 40 T, we identify the field-induced phases of URu2Si2 as a spin-density-wave state. The transition to the spin-density wave represents a unique touchstone for understanding the hidden-order phase. An intimate relationship between this magnetic structure, the magnetic fluctuations and the Fermi surface is emphasized, calling for dedicated band-structure calculations. The strongly-correlated electron system URu2Si2 possesses a hidden-order phase whose order parameter remains unidentified. Here, the authors demonstrate the development of spin-density-wave phases in URu2Si2 under high magnetic fields, providing a potential in-road to understanding this system.
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Affiliation(s)
- W Knafo
- Laboratoire National des Champs Magnétiques Intenses, UPR 3228, CNRS-UPS-INSA-UGA, 143 Avenue de Rangueil, 31400 Toulouse, France
| | - F Duc
- Laboratoire National des Champs Magnétiques Intenses, UPR 3228, CNRS-UPS-INSA-UGA, 143 Avenue de Rangueil, 31400 Toulouse, France
| | - F Bourdarot
- Service de Modélisation et d'Exploration des Matériaux, Université Grenoble Alpes et Commissariat á l'Energie Atomique, INAC, 17 rue des Martyrs, 38054 Grenoble, France
| | - K Kuwahara
- Institute of Quantum Beam Science, Ibaraki University, Mito 310-8512, Japan
| | - H Nojiri
- Institute for Materials Research, Tohoku University, Sendai 980-8578, Japan
| | - D Aoki
- Institute for Materials Research, Tohoku University, Ibaraki 311-1313, Japan.,Service Photonique, Electronique et Ingénierie Quantiques, Université Grenoble Alpes et Commissariat à l'Energie Atomique, INAC, 17 rue des Martyrs, 38054 Grenoble, France
| | - J Billette
- Laboratoire National des Champs Magnétiques Intenses, UPR 3228, CNRS-UPS-INSA-UGA, 143 Avenue de Rangueil, 31400 Toulouse, France
| | - P Frings
- Laboratoire National des Champs Magnétiques Intenses, UPR 3228, CNRS-UPS-INSA-UGA, 143 Avenue de Rangueil, 31400 Toulouse, France
| | - X Tonon
- Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042 Grenoble, France
| | - E Lelièvre-Berna
- Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042 Grenoble, France
| | - J Flouquet
- Service Photonique, Electronique et Ingénierie Quantiques, Université Grenoble Alpes et Commissariat à l'Energie Atomique, INAC, 17 rue des Martyrs, 38054 Grenoble, France
| | - L-P Regnault
- Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042 Grenoble, France
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Gourgout A, Pourret A, Knebel G, Aoki D, Seyfarth G, Flouquet J. Collapse of Ferromagnetism and Fermi Surface Instability near Reentrant Superconductivity of URhGe. Phys Rev Lett 2016; 117:046401. [PMID: 27494485 DOI: 10.1103/physrevlett.117.046401] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Indexed: 06/06/2023]
Abstract
We present thermoelectric power and resistivity measurements in the ferromagnetic superconductor URhGe for a magnetic field applied along the hard magnetization b axis of the orthorhombic crystal. Reentrant superconductivity is observed near the spin reorientation transition at H_{R}=12.75 T, where a first order transition from the ferromagnetic to the polarized paramagnetic state occurs. Special focus is given to the longitudinal configuration, where both the electric and heat current are parallel to the applied field. The validity of the Fermi-liquid T^{2} dependence of the resistivity through H_{R} demonstrates clearly that no quantum critical point occurs at H_{R}. Thus, the ferromagnetic transition line at H_{R} becomes first order implying the existence of a tricritical point at finite temperature. The enhancement of magnetic fluctuations in the vicinity of the tricritical point stimulates the reentrance of superconductivity. The abrupt sign change observed in the thermoelectric power with the thermal gradient applied along the b axis together with the strong anomalies in the other directions is definitive macroscopic evidence that in addition a significant change of the Fermi surface appears through H_{R}.
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Affiliation(s)
- A Gourgout
- University Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France
- CEA, INAC-PHELIQS, F-38000 Grenoble, France
| | - A Pourret
- University Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France
- CEA, INAC-PHELIQS, F-38000 Grenoble, France
| | - G Knebel
- University Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France
- CEA, INAC-PHELIQS, F-38000 Grenoble, France
| | - D Aoki
- University Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France
- CEA, INAC-PHELIQS, F-38000 Grenoble, France
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - G Seyfarth
- University Grenoble Alpes, LNCMI, F-38042 Grenoble Cedex 9, France
- CNRS, Laboratoire National des Champs Magnétiques Intenses LNCMI (UJF, UPS, INSA), UPR 3228, F-38042 Grenoble Cedex 9, France
| | - J Flouquet
- University Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France
- CEA, INAC-PHELIQS, F-38000 Grenoble, France
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Shimizu Y, Kittaka S, Sakakibara T, Tsutsumi Y, Nomoto T, Ikeda H, Machida K, Homma Y, Aoki D. Omnidirectional Measurements of Angle-Resolved Heat Capacity for Complete Detection of Superconducting Gap Structure in the Heavy-Fermion Antiferromagnet UPd_{2}Al_{3}. Phys Rev Lett 2016; 117:037001. [PMID: 27472129 DOI: 10.1103/physrevlett.117.037001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2016] [Indexed: 06/06/2023]
Abstract
Quasiparticle excitations in UPd_{2}Al_{3} were studied by means of heat-capacity (C) measurements under rotating magnetic fields using a high-quality single crystal. The field dependence shows C(H)∝H^{1/2}-like behavior at low temperatures for both two hexagonal crystal axes, i.e., H∥[0001] (c axis) and H∥[112[over ¯]0] (a axis), suggesting the presence of nodal quasiparticle excitations from heavy bands. At low temperatures, the polar-angle (θ) dependence of C exhibits a maximum along H∥[0001] with a twofold symmetric oscillation below 0.5 T, and an unusual shoulder or hump anomaly has been found around 30°-60° from the c axis in C(θ) at intermediate fields (1≲μ_{0}H≲2 T). These behaviors in UPd_{2}Al_{3} purely come from the superconducting nodal quasiparticle excitations, and can be successfully reproduced by theoretical calculations assuming the gap symmetry with a horizontal linear line node. We demonstrate the whole angle-resolved heat-capacity measurements done here as a novel spectroscopic method for nodal gap determination, which can be applied to other exotic superconductors.
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Affiliation(s)
- Yusei Shimizu
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Shunichiro Kittaka
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Toshiro Sakakibara
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Yasumasa Tsutsumi
- Department of Basic Science, The University of Tokyo, Meguro, Tokyo 153-8902, Japan
| | - Takuya Nomoto
- Departement of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - Hiroaki Ikeda
- Department of Physics, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Kazushige Machida
- Department of Physics, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Yoshiya Homma
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - Dai Aoki
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
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Kisu I, Kato Y, Yamada Y, Matsubara K, Obara H, Emoto K, Adachi M, Umene K, Nogami Y, Banno K, Kitagawa Y, Aoki D. Organ Perfusion for Uterus Transplantation in Non-Human Primates With Assumed Procurement of a Uterus From a Brain-Dead Donor. Transplant Proc 2016; 48:1266-9. [DOI: 10.1016/j.transproceed.2015.12.105] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2015] [Accepted: 12/30/2015] [Indexed: 01/08/2023]
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Braithwaite D, Knafo W, Settai R, Aoki D, Kurahashi S, Flouquet J. Pressure cell for transport measurements under high pressure and low temperature in pulsed magnetic fields. Rev Sci Instrum 2016; 87:023907. [PMID: 26931866 DOI: 10.1063/1.4941714] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We present a new specially designed pressure cell and technique adapted for resistivity measurements in pulsed magnetic fields up to 60 T at pressures up to at least 4 GPa, and temperatures down to 1.5 K. We show that heating effects during the pulse are acceptable (less than 1 K) and can be corrected allowing reliable temperature dependences of the magnetoresistance to be obtained. We illustrate the performance with a study of the phase diagram of the heavy fermion antiferromagnet CeRh2Si2.
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Affiliation(s)
| | - William Knafo
- Laboratoire National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA, Toulouse, France
| | - Rikio Settai
- Department of Physics, Niigata University, Niigata 950-2181, Japan
| | - Dai Aoki
- University Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France
| | - Shuhei Kurahashi
- Graduate School of Science and Technology, Niigata University, Niigata, Japan
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Aoki D, Seyfarth G, Pourret A, Gourgout A, McCollam A, Bruin JAN, Krupko Y, Sheikin I. Field-Induced Lifshitz Transition without Metamagnetism in CeIrIn(5). Phys Rev Lett 2016; 116:037202. [PMID: 26849611 DOI: 10.1103/physrevlett.116.037202] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Indexed: 06/05/2023]
Abstract
We report high magnetic field measurements of magnetic torque, thermoelectric power, magnetization, and the de Haas-van Alphen effect in CeIrIn_{5} across 28 T, where a metamagnetic transition was suggested in previous studies. The thermoelectric power displays two maxima at 28 and 32 T. Above 28 T, a new, low de Haas-van Alphen frequency with a strongly enhanced effective mass emerges, while the highest frequency observed at low field disappears entirely. This suggests a field-induced Lifshitz transition. However, longitudinal magnetization does not show any anomaly up to 33 T, thus ruling out a metamagnetic transition at 28 T.
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Affiliation(s)
- D Aoki
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
- Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France
- CEA, INAC-SPSMS, F-38000 Grenoble, France
| | - G Seyfarth
- Université Grenoble Alpes, LNCMI, 38042 Grenoble, France
- Laboratoire National des Champs Magnéetiques Intenses (LNCMI-EMFL), CNRS, UJF, 38042 Grenoble, France
| | - A Pourret
- Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France
- CEA, INAC-SPSMS, F-38000 Grenoble, France
| | - A Gourgout
- Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France
- CEA, INAC-SPSMS, F-38000 Grenoble, France
| | - A McCollam
- High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, The Netherlands
| | - J A N Bruin
- High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, The Netherlands
| | - Y Krupko
- Laboratoire National des Champs Magnéetiques Intenses (LNCMI-EMFL), CNRS, UJF, 38042 Grenoble, France
| | - I Sheikin
- Laboratoire National des Champs Magnéetiques Intenses (LNCMI-EMFL), CNRS, UJF, 38042 Grenoble, France
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Tokunaga Y, Aoki D, Mayaffre H, Krämer S, Julien MH, Berthier C, Horvatić M, Sakai H, Kambe S, Araki S. Reentrant superconductivity driven by quantum tricritical fluctuations in URhGe: evidence from ^{59}Co NMR in URh_{0.9}Co_{0.1}Ge. Phys Rev Lett 2015; 114:216401. [PMID: 26066447 DOI: 10.1103/physrevlett.114.216401] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Indexed: 06/04/2023]
Abstract
Our measurements of the ^{59}Co NMR spin-spin relaxation in URh_{0.9}Co_{0.1}Ge reveal a divergence of electronic spin fluctuations in the vicinity of the field-induced quantum critical point at H_{R}≈13 T, around which reentrant superconductivity (RSC) occurs in the ferromagnetic heavy fermion compound URhGe. We map out the strength of spin fluctuations in the (H_{b},H_{c}) plane of magnetic field components and show that critical fluctuations develop in the same limited region near the field H_{R} as that where RSC is observed. This strongly suggests these quantum fluctuations as the pairing glue responsible for the RSC. The fluctuations observed are characteristic of a tricritical point, followed by a phase bifurcation toward quantum critical end points.
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Affiliation(s)
- Y Tokunaga
- ASRC, Japan Atomic Energy Agency Tokai, Ibaraki 319-1195, Japan
| | - D Aoki
- INAC/SPSMS, CEA-Grenoble/UJF, 38054 Grenoble, France
- IMR, Tohoku University, Ibaraki 311-1313, Japan
| | - H Mayaffre
- LNCMI, UPR 3228, CNRS-UJF-UPS-INSA, 38042 Grenoble, France
| | - S Krämer
- LNCMI, UPR 3228, CNRS-UJF-UPS-INSA, 38042 Grenoble, France
| | - M-H Julien
- LNCMI, UPR 3228, CNRS-UJF-UPS-INSA, 38042 Grenoble, France
| | - C Berthier
- LNCMI, UPR 3228, CNRS-UJF-UPS-INSA, 38042 Grenoble, France
| | - M Horvatić
- LNCMI, UPR 3228, CNRS-UJF-UPS-INSA, 38042 Grenoble, France
| | - H Sakai
- ASRC, Japan Atomic Energy Agency Tokai, Ibaraki 319-1195, Japan
| | - S Kambe
- ASRC, Japan Atomic Energy Agency Tokai, Ibaraki 319-1195, Japan
| | - S Araki
- INAC/SPSMS, CEA-Grenoble/UJF, 38054 Grenoble, France
- Department of Physics, Okayama University, Okayama 700-8530, Japan
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Nakanishi T, Aoki D, Watanabe Y, Ando Y, Tomotsugu N, Sato Y, Saito T. A Phase II clinical trial of pegylated liposomal doxorubicin and carboplatin in Japanese patients with platinum-sensitive recurrent ovarian, fallopian tube or primary peritoneal cancer. Jpn J Clin Oncol 2015; 45:422-6. [DOI: 10.1093/jjco/hyv016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Accepted: 01/18/2015] [Indexed: 11/13/2022] Open
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Yoshihama T, Chiyoda T, Kataoka F, Nomura H, Iguchi Y, Hashimoto S, Yamagami W, Tominaga E, Susumu N, Tsuda H, Aoki D. Effectiveness of third-line chemotherapy in recurrent ovarian cancer patients. EUR J GYNAECOL ONCOL 2015; 36:424-427. [PMID: 26390696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
OBJECTIVE Despite recent advances in the treatment of recurrent ovarian cancer, little evidence exists describing the benefit of third- line chemotherapy. The present authors previously reported that the treatment-free interval (TFI) after second-line chemotherapy may predict a survival benefit of third-line chemotherapy, however the length of TFI was uncertain due to limited cases. In this study, the authors evaluated the length of TFI, which is correlated with the effectiveness of third-line chemotherapy and a prognostic factor of third-line chemotherapy. MATERIALS AND METHODS The authors reviewed the medical records of 85 women with recurrent ovarian cancer who received third-line chemotherapy after a paclitaxel/carboplatin (PC) regimen as first-line chemotherapy. RESULTS The response rate [complete response (CR) + partial response (PR)] and clinical benefit rate [(CBR): CR + PR + stable disease (SD)] during the TFI after second-line chemotherapy for 0-3 months, 3-6 months, and 6-12 months and ≥ 12 months were 9.8%, 0%, 0%, 43.8% and 15.7%, 50%, 66.7%, and 93.8%, respectively. The median overall survival (OS) from the onset of third-line chemotherapy was longer for TFI ≥ 3 months than for TFI 0-3 months (795 days vs. 281 days, p < 0.001). Finally, according to univariate (HR = 0.256; p < 0.001) and multivariate (HR = 0.264; p < 0.001) analyses, TFI was the independent significant prognostic factor for OS. CONCLUSIONS TFI less than three months after second-line chemotherapy may predict little survival benefit of third-line chemotherapy.
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Sakai K, Yamagami W, Susumu N, Nomura H, Kataoka F, Banno K, Tsuda H, Aoki D. Pathological factors associated with omental metastases in endometrial cancer. EUR J GYNAECOL ONCOL 2015; 36:397-401. [PMID: 26390690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
PURPOSE OF INVESTIGATION This study aimed to assess the role of omentectomy in the surgical therapy of endometrial cancer. MATERI- ALS AND METHODS: A retrospective study was performed in 98 patients who were pathologically diagnosed with endometrial cancer and had initially undergone surgical therapy at the present institution. This study analyzed the relationship between omental metastasis and clinicopathological factors. RESULTS Omental metastasis was detected in nine patients (9%). On univariate analysis, significant number of omental metastatic lesions were detected in few cases by positive peritoneal cytology, adnexal metastasis, gross dissemination, and lymphovascular space involvement. On multivariate analysis, adnexal metastasis were a significant risk factor. The sensitivity of the spe- cial histological type and the specificity of the macroscopic peritoneal dissemination and adnexal metastasis were all high. CONCLUSION Omentectomy plays a significant role in determining the exact surgical staging in cases with non-endometrioid cancer, adnexal metas- tasis, and macroscopic peritoneal dissemination.
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Buhot J, Méasson MA, Gallais Y, Cazayous M, Sacuto A, Lapertot G, Aoki D. Symmetry of the excitations in the hidden order state of URu2Si2. Phys Rev Lett 2014; 113:266405. [PMID: 25615363 DOI: 10.1103/physrevlett.113.266405] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Indexed: 06/04/2023]
Abstract
We perform polarized electronic Raman scattering on URu2Si2 single crystals at low temperature down to 8 K in the hidden-order state and under a magnetic field up to 10 T. The hidden-order state is characterized by a sharp excitation at 1.7 meV and a gap in the electronic continuum below 6.8 meV. Both Raman signatures are of pure A2g symmetry. By comparing the behavior of the Raman sharp excitation and the neutron resonance at Q0=(0,0,1), we provide new evidence, constrained by selection rules of the two probes, that the hidden-order state breaks the translational symmetry along the c axis such that Γ and Z points fold on top of each other. The observation of these distinct Raman features with a peculiar A2g symmetry as a signature of the hidden-order phase places strong constraints on current theories of the hidden-order in URu2Si2.
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Affiliation(s)
- J Buhot
- Laboratoire Matériaux et Phénomènes Quantiques, UMR 7162 CNRS, Université Paris Diderot, Bâtiment Condorcet, 75205 Paris Cedex 13, France
| | - M-A Méasson
- Laboratoire Matériaux et Phénomènes Quantiques, UMR 7162 CNRS, Université Paris Diderot, Bâtiment Condorcet, 75205 Paris Cedex 13, France
| | - Y Gallais
- Laboratoire Matériaux et Phénomènes Quantiques, UMR 7162 CNRS, Université Paris Diderot, Bâtiment Condorcet, 75205 Paris Cedex 13, France
| | - M Cazayous
- Laboratoire Matériaux et Phénomènes Quantiques, UMR 7162 CNRS, Université Paris Diderot, Bâtiment Condorcet, 75205 Paris Cedex 13, France
| | - A Sacuto
- Laboratoire Matériaux et Phénomènes Quantiques, UMR 7162 CNRS, Université Paris Diderot, Bâtiment Condorcet, 75205 Paris Cedex 13, France
| | - G Lapertot
- Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France and CEA, INAC-SPSMS, F-38000 Grenoble, France
| | - D Aoki
- Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France and CEA, INAC-SPSMS, F-38000 Grenoble, France
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Kojima T, Yamada H, Saito Y, Nawa T, Isobe M, Yamamoto T, Aoki D, Matsushita Y, Fukushima K. Investigation of dyeing behavior of oxidative dye in fine structures of the human hair cuticle by nanoscale secondary ion mass spectrometry. Skin Res Technol 2014; 21:295-301. [PMID: 25323334 DOI: 10.1111/srt.12192] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/20/2014] [Indexed: 11/27/2022]
Abstract
BACKGROUND/PURPOSE In oxidative coloring, the hair cuticle layers are not only the penetration pathway for active ingredients but also one of the most important dyeing regions. The dyeing mechanism of oxidative dyes in fine structures of the cuticle remains unclear. To investigate the dyeing behavior of oxidative dyes in fine structures of the cuticle, hair cross-sections were analyzed by nanoscale secondary ion mass spectrometry (NanoSIMS). METHODS The preparation method of hair cross-section for NanoSIMS measurement was improved. Improved hair cross-sections were analyzed using NanoSIMS. RESULTS The cuticle layer thickness of the hair cross-section could be widened. It was confirmed that (12) C(-) ions were more strongly detected from endocuticle than from other fine structures of cuticle. The NanoSIMS (12) C(-) image and hue saturation intensity (HSI) D(-) /(1) H(-) ratio image of the hair, dyed with deuterium-labeled oxidative dye, indicated that the endocuticle had a higher D(-) /(1) H(-) ratio than the other fine structures of the cuticle. It was substantiated that more colored chromophores were fixated in the endocuticle than in other fine structures of the cuticle. CONCLUSION The dyeing behavior of oxidative dyes in fine structures of hair cuticle was substantiated by NanoSIMS analysis using the improved hair cross-section preparation method.
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Affiliation(s)
- T Kojima
- General Research & Development Institute, Hoyu Co., Ltd., Nagakute, Aichi, Japan
| | - H Yamada
- General Research & Development Institute, Hoyu Co., Ltd., Nagakute, Aichi, Japan
| | - Y Saito
- General Research & Development Institute, Hoyu Co., Ltd., Nagakute, Aichi, Japan
| | - T Nawa
- General Research & Development Institute, Hoyu Co., Ltd., Nagakute, Aichi, Japan
| | - M Isobe
- General Research & Development Institute, Hoyu Co., Ltd., Nagakute, Aichi, Japan
| | - T Yamamoto
- General Research & Development Institute, Hoyu Co., Ltd., Nagakute, Aichi, Japan
| | - D Aoki
- Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
| | - Y Matsushita
- Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
| | - K Fukushima
- Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
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