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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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Seiwerth I, Plößl S, Herzog M, Schilde S, Radetzki F, Krämer S, Rahne T, Plontke SK. Individual computer-assisted 3D planning for placement of auricular prosthesis anchors in combination with an implantable transcutaneous bone conduction hearing device in patients with aural atresia. HNO 2023; 71:1-9. [PMID: 36083471 PMCID: PMC10409664 DOI: 10.1007/s00106-022-01190-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/12/2022] [Indexed: 11/04/2022]
Abstract
BACKGROUND The simultaneous implantation of the Bonebridge (MED-EL, Innsbruck, Austria), a semi-implantable active transcutaneous bone conduction hearing device and anchors for auricular prostheses can be challenging as both implants contain magnets and compete for the narrow space in the designated implantation area. MATERIAL AND METHODS A preoperative planning tool (virtual surgery) was used with individual 3D computer models of the skull and implants for finding optimal implant positions for both the floating mass transducer (FMT) and the anchors for the auricular prosthesis. The interaction between the magnetic prosthesis anchors and the FMT was measured by means of static magnetic forces. A retrospective data analysis was conducted to evaluate the surgical and audiological outcome. RESULTS Between 2014 and 2021, a 3D planning of a simultaneous implantation of the Bonebridge with auricular prosthesis anchors was conducted on 6 ears of 5 patients (3 males, 2 females; age range 17-56 years). The individual preoperative planning was considered very useful for the optimal placement of bone anchors in combination with the Bonebridge. Audiological data showed a clear benefit for hearing 3 months and > 11 months after implantation. No adverse interactions between the magnetic prosthesis anchors and the FMT were observed. In two patients, revision surgery was carried out due to skin inflammation or wound healing problems. No long-term complications were observed 3-5 years after surgery. CONCLUSION Preoperative 3D planning represents a clear benefit for the simultaneous audiological and esthetic rehabilitation using the Bonebridge and anchors for auricular prostheses.
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Affiliation(s)
- Ingmar Seiwerth
- Department of Otorhinolaryngology, Head and Neck Surgery, University Medicine Halle (Saale), Martin Luther University Halle-Wittenberg, Ernst-Grube-Str. 40, 06120, Halle (Saale), Germany
| | - Sebastian Plößl
- Department of Otorhinolaryngology, Head and Neck Surgery, University Medicine Halle (Saale), Martin Luther University Halle-Wittenberg, Ernst-Grube-Str. 40, 06120, Halle (Saale), Germany
- Department of Otorhinolaryngology, Head and Neck Surgery, Martha-Maria Hospital Halle-Dölau, Halle (Saale), Germany
| | - Michael Herzog
- Department of Otorhinolaryngology, Head and Neck Surgery, University Medicine Halle (Saale), Martin Luther University Halle-Wittenberg, Ernst-Grube-Str. 40, 06120, Halle (Saale), Germany
- Department of Otorhinolaryngology, Carl Thiem Klinikum, Cottbus, Germany
| | - Sebastian Schilde
- Department of Orthopedic and Trauma Surgery, University Medicine Halle (Saale), Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Florian Radetzki
- Department of Orthopedic and Trauma Surgery, University Medicine Halle (Saale), Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
- Department of Orthopedic und Trauma Surgery, Brandenburg Medical School Theodor Fontane, Klinikum Dessau, Dessau, Germany
| | | | - Torsten Rahne
- Department of Otorhinolaryngology, Head and Neck Surgery, University Medicine Halle (Saale), Martin Luther University Halle-Wittenberg, Ernst-Grube-Str. 40, 06120, Halle (Saale), Germany
| | - Stefan K Plontke
- Department of Otorhinolaryngology, Head and Neck Surgery, University Medicine Halle (Saale), Martin Luther University Halle-Wittenberg, Ernst-Grube-Str. 40, 06120, Halle (Saale), Germany.
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Schork N, Ibrahim M, Baksi A, Krämer S, Powell AK, Guthausen G. NMR Relaxivities of Paramagnetic, Ultra-High Spin Heterometallic Clusters within Polyoxometalate Matrix as a Function of Solvent and Metal Ion. Chemphyschem 2022; 23:e202200215. [PMID: 35896954 DOI: 10.1002/cphc.202200215] [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: 03/31/2022] [Revised: 06/22/2022] [Indexed: 11/05/2022]
Abstract
Selectivity and image contrast are always challenging in magnetic resonance imaging (MRI), which are - inter alia - addressed by contrast agents. These compounds still need to be improved, and their relaxation properties, i. e., their paramagnetic relaxation enhancement (PRE), needs to be understood. The main goal is to improve specificity and relaxivities, especially at the high magnetic fields currently exploited not only in material science but also in the medical environment. Longitudinal and transverse relaxivities, r1 and r2 , which correspond to the longitudinal and transverse relaxation rates R1 and R2, normalized to the concentration of the paramagnetic moieties, need to be considered because both contribute to the image contrast. 1 H-relaxivities r1 and r2 of high-spin heterometallic clusters were studied containing lanthanide and transition-metal ions within a polyoxometalate matrix. A wide range of magnetic fields from 0.5 T/20 MHz to 33 T/1.4 GHz was applied. The questions addressed here concern the rotational and diffusion correlation times which determine the relaxivities and are affected by the solvent's viscosity. Moreover, the variation of the lanthanide and transition-metal ions of the clusters provided insights into the sensitivity of PRE with respect to the electron spin properties of the paramagnetic centers as well as cooperative effects between lanthanides and transition metal ions.
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Affiliation(s)
- Nicolas Schork
- Karlsruhe Institute of Technology (KIT), Institutes of Mechanical Engineering and Mechanics and of Water Chemistry and Technology, Adenauerring 20b, 76131, Karlsruhe, Germany
| | - Masooma Ibrahim
- Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology (INT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Ananya Baksi
- Technische Universität Dortmund, Anorganische Chemie, Otto-Hahn-Straße 6, 44227, Dortmund, Germany
| | - Steffen Krämer
- CNRS, LNCMI-EMFL, Université Grenoble Alpes, INSA-T, and UPS, Boîte Postale 166, 38042, Grenoble Cedex 9, France
| | - Annie K Powell
- Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology (INT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.,Karlsruhe Institute of Technology (KIT), Institute of Inorganic Chemistry, Engesserstrasse 15, 76131, Karlsruhe, Germany.,Karlsruhe Institute of Technology (KIT), Institute for Quantum Materials and Technologies (IQMT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Gisela Guthausen
- Karlsruhe Institute of Technology (KIT), Institutes of Mechanical Engineering and Mechanics and of Water Chemistry and Technology, Adenauerring 20b, 76131, Karlsruhe, Germany
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Venu AC, Nasser Din R, Rudszuck T, Picchetti P, Chakraborty P, Powell AK, Krämer S, Guthausen G, Ibrahim M. NMR Relaxivities of Paramagnetic Lanthanide-Containing Polyoxometalates. Molecules 2021; 26:7481. [PMID: 34946561 PMCID: PMC8703889 DOI: 10.3390/molecules26247481] [Citation(s) in RCA: 2] [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: 10/12/2021] [Revised: 12/02/2021] [Accepted: 12/03/2021] [Indexed: 11/16/2022] Open
Abstract
The current trend for ultra-high-field magnetic resonance imaging (MRI) technologies opens up new routes in clinical diagnostic imaging as well as in material imaging applications. MRI selectivity is further improved by using contrast agents (CAs), which enhance the image contrast and improve specificity by the paramagnetic relaxation enhancement (PRE) mechanism. Generally, the efficacy of a CA at a given magnetic field is measured by its longitudinal and transverse relaxivities r1 and r2, i.e., the longitudinal and transverse relaxation rates T1-1 and T2-1 normalized to CA concentration. However, even though basic NMR sensitivity and resolution become better in stronger fields, r1 of classic CA generally decreases, which often causes a reduction of the image contrast. In this regard, there is a growing interest in the development of new contrast agents that would be suitable to work at higher magnetic fields. One of the strategies to increase imaging contrast at high magnetic field is to inspect other paramagnetic ions than the commonly used Gd(III)-based CAs. For lanthanides, the magnetic moment can be higher than that of the isotropic Gd(III) ion. In addition, the symmetry of electronic ground state influences the PRE properties of a compound apart from diverse correlation times. In this work, PRE of water 1H has been investigated over a wide range of magnetic fields for aqueous solutions of the lanthanide containing polyoxometalates [DyIII(H2O)4GeW11O39]5- (Dy-W11), [ErIII(H2O)3GeW11O39]5- (Er-W11) and [{ErIII(H2O)(CH3COO)(P2W17O61)}2]16- (Er2-W34) over a wide range of frequencies from 20 MHz to 1.4 GHz. Their relaxivities r1 and r2 increase with increasing applied fields. These results indicate that the three chosen POM systems are potential candidates for contrast agents, especially at high magnetic fields.
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Affiliation(s)
- Aiswarya Chalikunnath Venu
- Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology (INT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany; (A.C.V.); (P.P.); (P.C.)
| | - Rami Nasser Din
- LNCMI-EMFL, CNRS, INSA-T and UPS, Université Grenoble Alpes, Boîte Postale 166, CEDEX 9, 38042 Grenoble, France;
| | - Thomas Rudszuck
- Karlsruhe Institute of Technology (KIT), MVM-VM, Adenauerring 20b, 76131 Karlsruhe, Germany;
| | - Pierre Picchetti
- Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology (INT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany; (A.C.V.); (P.P.); (P.C.)
| | - Papri Chakraborty
- Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology (INT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany; (A.C.V.); (P.P.); (P.C.)
| | - Annie K. Powell
- Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology (INT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany; (A.C.V.); (P.P.); (P.C.)
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, 76131 Karlsruhe, Germany
- Institute for Quantum Materials and Technologies (IQMT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Steffen Krämer
- LNCMI-EMFL, CNRS, INSA-T and UPS, Université Grenoble Alpes, Boîte Postale 166, CEDEX 9, 38042 Grenoble, France;
| | - Gisela Guthausen
- Karlsruhe Institute of Technology (KIT), MVM-VM, Adenauerring 20b, 76131 Karlsruhe, Germany;
- Karlsruhe Institute of Technology (KIT), EBI-WCWT, Adenauerring 20b, 76131 Karlsruhe, Germany
| | - Masooma Ibrahim
- Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology (INT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany; (A.C.V.); (P.P.); (P.C.)
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Vinograd I, Zhou R, Hirata M, Wu T, Mayaffre H, Krämer S, Liang R, Hardy WN, Bonn DA, Julien MH. Locally commensurate charge-density wave with three-unit-cell periodicity in YBa 2Cu 3O y. Nat Commun 2021; 12:3274. [PMID: 34075033 PMCID: PMC8169916 DOI: 10.1038/s41467-021-23140-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 04/16/2021] [Indexed: 11/20/2022] Open
Abstract
In order to identify the mechanism responsible for the formation of charge-density waves (CDW) in cuprate superconductors, it is important to understand which aspects of the CDW's microscopic structure are generic and which are material-dependent. Here, we show that, at the local scale probed by NMR, long-range CDW order in YBa2Cu3Oy is unidirectional with a commensurate period of three unit cells (λ = 3b), implying that the incommensurability found in X-ray scattering is ensured by phase slips (discommensurations). Furthermore, NMR spectra reveal a predominant oxygen character of the CDW with an out-of-phase relationship between certain lattice sites but no specific signature of a secondary CDW with λ = 6b associated with a putative pair-density wave. These results shed light on universal aspects of the cuprate CDW. In particular, its spatial profile appears to generically result from the interplay between an incommensurate tendency at long length scales, possibly related to properties of the Fermi surface, and local commensuration effects, due to electron-electron interactions or lock-in to the lattice.
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Affiliation(s)
- Igor Vinograd
- Univ. Grenoble Alpes, INSA Toulouse, Univ. Toulouse Paul Sabatier, EMFL, CNRS, LNCMI, Grenoble, France.
| | - Rui Zhou
- Univ. Grenoble Alpes, INSA Toulouse, Univ. Toulouse Paul Sabatier, EMFL, CNRS, LNCMI, Grenoble, France
- Institute of Physics, Chinese Academy of Sciences, and Beijing National Laboratory for Condensed Matter Physics, Beijing, China
| | - Michihiro Hirata
- Univ. Grenoble Alpes, INSA Toulouse, Univ. Toulouse Paul Sabatier, EMFL, CNRS, LNCMI, Grenoble, France
- MPA-Q, Los Alamos National Laboratory, Los Alamos, NM, USA
| | - Tao Wu
- Univ. Grenoble Alpes, INSA Toulouse, Univ. Toulouse Paul Sabatier, EMFL, CNRS, LNCMI, Grenoble, France
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, China
| | - Hadrien Mayaffre
- Univ. Grenoble Alpes, INSA Toulouse, Univ. Toulouse Paul Sabatier, EMFL, CNRS, LNCMI, Grenoble, France
| | - Steffen Krämer
- Univ. Grenoble Alpes, INSA Toulouse, Univ. Toulouse Paul Sabatier, EMFL, CNRS, LNCMI, Grenoble, France
| | - Ruixing Liang
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, Canada
- Canadian Institute for Advanced Research, Toronto, Canada
| | - W N Hardy
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, Canada
- Canadian Institute for Advanced Research, Toronto, Canada
| | - D A Bonn
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, Canada
- Canadian Institute for Advanced Research, Toronto, Canada
| | - Marc-Henri Julien
- Univ. Grenoble Alpes, INSA Toulouse, Univ. Toulouse Paul Sabatier, EMFL, CNRS, LNCMI, Grenoble, France.
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Kowalewski J, Fries PH, Kruk D, Odelius M, Egorov AV, Krämer S, Stork H, Horvatić M, Berthier C. Field-dependent paramagnetic relaxation enhancement in solutions of Ni(II): What happens above the NMR proton frequency of 1 GHz? J Magn Reson 2020; 314:106737. [PMID: 32380383 DOI: 10.1016/j.jmr.2020.106737] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Revised: 04/22/2020] [Accepted: 04/23/2020] [Indexed: 06/11/2023]
Abstract
An extended set of paramagnetic relaxation enhancement (PRE) data, up to the field of 32.9 Tesla, is reported for protons in an acidified aqueous solution of a Ni(II) salt in the presence and in the absence of added glycerol. For the 55% w/w glycerol sample, a distinct maximum in the PRE vs magnetic field curve is observed for the first time. The data are analysed using the Swedish slow-motion theory, including both the intramolecular (inner-sphere) and intermolecular (outer-sphere) contributions. The results indicate that estimating the outer-sphere part in the presence of the more efficient inner-sphere term is a difficult task.
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Affiliation(s)
- Jozef Kowalewski
- Department of Materials and Environmental Chemistry, Stockholm University, SE-116 91 Stockholm, Sweden.
| | - Pascal H Fries
- Univ. Grenoble Alpes, CEA, IRIG-MEM, 38000 Grenoble, France
| | - Danuta Kruk
- University of Warmia and Mazury in Olsztyn, Faculty of Mathematics and Computer Science, Sloneczna 54, PL-10710 Olsztyn, Poland
| | - Michael Odelius
- Department of Physics, AlbaNova University Center, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Andrei V Egorov
- St.Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
| | - Steffen Krämer
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, Univ. Grenoble Alpes, INSA Toulouse, Univ. Toulouse Paul Sabatier, B.P. 166, 38042 Grenoble Cedex 09, France
| | - Holger Stork
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, Univ. Grenoble Alpes, INSA Toulouse, Univ. Toulouse Paul Sabatier, B.P. 166, 38042 Grenoble Cedex 09, France
| | - Mladen Horvatić
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, Univ. Grenoble Alpes, INSA Toulouse, Univ. Toulouse Paul Sabatier, B.P. 166, 38042 Grenoble Cedex 09, France
| | - Claude Berthier
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, Univ. Grenoble Alpes, INSA Toulouse, Univ. Toulouse Paul Sabatier, B.P. 166, 38042 Grenoble Cedex 09, France
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Ibrahim M, Krämer S, Schork N, Guthausen G. Polyoxometalate-based high-spin cluster systems: a NMR relaxivity study up to 1.4 GHz/33 T. Dalton Trans 2019; 48:15597-15604. [DOI: 10.1039/c9dt02052g] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Paramagnetic polyoxometalates are of special interest with regard to their application as alternative contrast agents in nonhuman magnetic resonance imaging which is increasingly used in materials science and process engineering.
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Affiliation(s)
- Masooma Ibrahim
- Karlsruhe Institute of Technology (KIT)
- Institute of Nanotechnology (INT)
- D-76344 Eggenstein-Leopoldshafen
- Germany
| | - Steffen Krämer
- Laboratoire National des Champs Magnétiques Intenses
- LNCMI-CNRS (UPR3228)
- EMFL
- Univ. Grenoble Alpes
- INSA Toulouse
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Orlova A, Mayaffre H, Krämer S, Dupont M, Capponi S, Laflorencie N, Paduan-Filho A, Horvatić M. Detection of a Disorder-Induced Bose-Einstein Condensate in a Quantum Spin Material at High Magnetic Fields. Phys Rev Lett 2018; 121:177202. [PMID: 30411922 DOI: 10.1103/physrevlett.121.177202] [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: 05/02/2018] [Indexed: 06/08/2023]
Abstract
The coupled spin-1 chains material NiCl_{2}-4SC(NH_{2})_{2} (DTN) doped with Br impurities is expected to be a perfect candidate for observing many-body localization at high magnetic field: the so-called "Bose glass," a zero-temperature bosonic fluid, compressible, gapless, incoherent, and short-range correlated. Using nuclear magnetic resonance, we critically address the stability of the Bose glass in doped DTN, and find that it hosts a novel disorder-induced ordered state of matter, where many-body physics leads to an unexpected resurgence of quantum coherence emerging from localized impurity states. An experimental phase diagram of this new "order-from-disorder" phase, established from nuclear magnetic resonance T_{1}^{-1} relaxation rate data in the 13±1% Br-doped DTN, is found to be in excellent agreement with the theoretical prediction from large-scale quantum Monte Carlo simulations.
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Affiliation(s)
- A Orlova
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
| | - H Mayaffre
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
| | - S Krämer
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
| | - M Dupont
- Laboratoire de Physique Théorique, IRSAMC, Université de Toulouse, CNRS, UPS, 31062 Toulouse, France
| | - S Capponi
- Laboratoire de Physique Théorique, IRSAMC, Université de Toulouse, CNRS, UPS, 31062 Toulouse, France
| | - N Laflorencie
- Laboratoire de Physique Théorique, IRSAMC, Université de Toulouse, CNRS, UPS, 31062 Toulouse, France
| | - A Paduan-Filho
- Instituto de Física, Universidade de São Paulo, 05315-970 São Paulo, Brazil
| | - M Horvatić
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
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Abstract
Gonadotropins can stimulate ovarian cancer growth in cell cultures. Corresponding LH/hCG receptors have been demonstrated in ovarian cancer. However, reduction of elevated serum gonadotropins by GnRH analogs in ovarian cancer patients did not lead to growth restriction, which means that serum levels of gonadotropins may not play the most important role in ovarian cancer. We therefore analyzed the LH and FSH concentrations in cyst fluids of ovarian cancer. Patients with preoperatively diagnosed cystic ovarian tumors were eligible for the study. Serum samples of the patients were obtained during surgery, while the fluids within the cysts were aspirated after surgical removal of the tumor. FSH and LH levels in serum and cyst fluids were measured using single antibody EIA (Boehringer Mannheim GmbH, Germany). Cyst fluids and sera of 108 patients were evaluated. While there were no significant differences in the FSH and LH serum concentrations, highly significant differences in the FSH and LH levels in cyst fluids were found. Only cancer cysts contained FSH and LH, while the corresponding concentrations in benign cysts were always below the measuring range of the assays. This clear division between high gonadotropin levels in cysts of serous ovarian cancer and low or absent concentrations in benign ovarian tumors further supports the hypothesis that FSH and LH may play a role in ovarian cancer; however, explanations for this surprising finding are still lacking.
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Affiliation(s)
- S. Krämer
- Department of Gynaecology and Obstetrics, University of Erlangen-Nuremberg - Germany
| | - M. Leeker
- Department of Gynaecology and Obstetrics, University of Erlangen-Nuremberg - Germany
| | - W. Jäger
- Department of Gynaecology and Obstetrics, University of Erlangen-Nuremberg - Germany
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Mulla Y, Krämer S, Doenst T, Steinert M, Eichfeld U. Predictive Risk Factors for Lymph Node Metastases in Patients with Resected Non-Small Lung Cancer: Single-center Experience. Thorac Cardiovasc Surg 2018. [DOI: 10.1055/s-0038-1627905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Y. Mulla
- Department of Visceral, Transplant, Thoracic and Vascular Surgery, University Hospital Leipzig, Leipzig, Germany
| | - S. Krämer
- Department of Visceral, Transplant, Thoracic and Vascular Surgery, University Hospital Leipzig, Leipzig, Germany
| | - T. Doenst
- Klinik für Herz- und Thoraxchirurgie, Friedrich-Schiller-Universität Jena, Jena, Germany
| | - M. Steinert
- Klinik für Herz- und Thoraxchirurgie, Friedrich-Schiller-Universität Jena, Jena, Germany
| | - U. Eichfeld
- Department of Visceral, Transplant, Thoracic and Vascular Surgery, University Hospital Leipzig, Leipzig, Germany
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11
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Orlova A, Green EL, Law JM, Gorbunov DI, Chanda G, Krämer S, Horvatić M, Kremer RK, Wosnitza J, Rikken GLJA. Nuclear Magnetic Resonance Signature of the Spin-Nematic Phase in LiCuVO_{4} at High Magnetic Fields. Phys Rev Lett 2017; 118:247201. [PMID: 28665634 DOI: 10.1103/physrevlett.118.247201] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Indexed: 06/07/2023]
Abstract
We report a ^{51}V nuclear magnetic resonance investigation of the frustrated spin-1/2 chain compound LiCuVO_{4}, performed in pulsed magnetic fields and focused on high-field phases up to 56 T. For the crystal orientations H∥c and H∥b, we find a narrow field region just below the magnetic saturation where the local magnetization remains uniform and homogeneous, while its value is field dependent. This behavior is the first microscopic signature of the spin-nematic state, breaking spin-rotation symmetry without generating any transverse dipolar order, and is consistent with theoretical predictions for the LiCuVO_{4} compound.
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Affiliation(s)
- A Orlova
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS, UGA, UPS, INSA, EMFL, 31400 Toulouse and 38042 Grenoble, France
| | - E L Green
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
| | - J M Law
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
| | - D I Gorbunov
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
| | - G Chanda
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
| | - S Krämer
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS, UGA, UPS, INSA, EMFL, 31400 Toulouse and 38042 Grenoble, France
| | - M Horvatić
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS, UGA, UPS, INSA, EMFL, 31400 Toulouse and 38042 Grenoble, France
| | - R K Kremer
- Max-Planck Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany
| | - J Wosnitza
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
- Institut für Festkörperphysik, TU Dresden, 01062 Dresden, Germany
| | - G L J A Rikken
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS, UGA, UPS, INSA, EMFL, 31400 Toulouse and 38042 Grenoble, France
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12
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Markó L, Mannaa M, Haschler TN, Krämer S, Gollasch M. Renoprotection: focus on TRPV1, TRPV4, TRPC6 and TRPM2. Acta Physiol (Oxf) 2017; 219:589-612. [PMID: 28028935 DOI: 10.1111/apha.12828] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [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: 03/20/2016] [Revised: 04/22/2016] [Accepted: 10/31/2016] [Indexed: 01/09/2023]
Abstract
Members of the transient receptor potential (TRP) cation channel receptor family have unique sites of regulatory function in the kidney which enables them to promote regional vasodilatation and controlled Ca2+ influx into podocytes and tubular cells. Activated TRP vanilloid 1 receptor channels (TRPV1) have been found to elicit renoprotection in rodent models of acute kidney injury following ischaemia/reperfusion. Transient receptor potential cation channel, subfamily C, member 6 (TRPC6) in podocytes is involved in chronic proteinuric kidney disease, particularly in focal segmental glomerulosclerosis (FSGS). TRP vanilloid 4 receptor channels (TRPV4) are highly expressed in the kidney, where they induce Ca2+ influx into endothelial and tubular cells. TRP melastatin (TRPM2) non-selective cation channels are expressed in the cytoplasm and intracellular organelles, where their inhibition ameliorates ischaemic renal pathology. Although some of their basic properties have been recently identified, the renovascular role of TRPV1, TRPV4, TRPC6 and TRPM2 channels in disease states such as obesity, hypertension and diabetes is largely unknown. In this review, we discuss recent evidence for TRPV1, TRPV4, TRPC6 and TRPM2 serving as potential targets for acute and chronic renoprotection in chronic vascular and metabolic disease.
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Affiliation(s)
- L. Markó
- Experimental and Clinical Research Center; A Joint Cooperation Between the Charité Medical Faculty and the Max-Delbrück Center (MDC) for Molecular Medicine; Berlin Germany
| | - M. Mannaa
- Experimental and Clinical Research Center; A Joint Cooperation Between the Charité Medical Faculty and the Max-Delbrück Center (MDC) for Molecular Medicine; Berlin Germany
- Charité Campus Virchow; Nephrology/Intensive Care; Berlin Germany
- German Institute of Human Nutrition; Potsdam-Rehbrücke Germany
| | - T. N. Haschler
- Experimental and Clinical Research Center; A Joint Cooperation Between the Charité Medical Faculty and the Max-Delbrück Center (MDC) for Molecular Medicine; Berlin Germany
- German Institute of Human Nutrition; Potsdam-Rehbrücke Germany
| | - S. Krämer
- German Institute of Human Nutrition; Potsdam-Rehbrücke Germany
| | - M. Gollasch
- Experimental and Clinical Research Center; A Joint Cooperation Between the Charité Medical Faculty and the Max-Delbrück Center (MDC) for Molecular Medicine; Berlin Germany
- Charité Campus Virchow; Nephrology/Intensive Care; Berlin Germany
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13
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Zhou R, Hirata M, Wu T, Vinograd I, Mayaffre H, Krämer S, Horvatić M, Berthier C, Reyes AP, Kuhns PL, Liang R, Hardy WN, Bonn DA, Julien MH. Quasiparticle Scattering off Defects and Possible Bound States in Charge-Ordered YBa_{2}Cu_{3}O_{y}. Phys Rev Lett 2017; 118:017001. [PMID: 28106424 DOI: 10.1103/physrevlett.118.017001] [Citation(s) in RCA: 2] [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: 07/19/2016] [Indexed: 06/06/2023]
Abstract
We report the NMR observation of a skewed distribution of ^{17}O Knight shifts when a magnetic field quenches superconductivity and induces long-range charge-density-wave (CDW) order in YBa_{2}Cu_{3}O_{y}. This distribution is explained by an inhomogeneous pattern of the local density of states N(E_{F}) arising from quasiparticle scattering off, yet unidentified, defects in the CDW state. We argue that the effect is most likely related to the formation of quasiparticle bound states, as is known to occur, under specific circumstances, in some metals and superconductors (but not in the CDW state, in general, except for very few cases in 1D materials). These observations should provide insight into the microscopic nature of the CDW, especially regarding the reconstructed band structure and the sensitivity to disorder.
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Affiliation(s)
- R Zhou
- Laboratoire National des Champs Magnétiques Intenses, CNRS-Université Grenoble Alpes-UPS-INSA-EMFL, 38042 Grenoble, France
| | - M Hirata
- Laboratoire National des Champs Magnétiques Intenses, CNRS-Université Grenoble Alpes-UPS-INSA-EMFL, 38042 Grenoble, France
| | - T Wu
- Laboratoire National des Champs Magnétiques Intenses, CNRS-Université Grenoble Alpes-UPS-INSA-EMFL, 38042 Grenoble, France
| | - I Vinograd
- Laboratoire National des Champs Magnétiques Intenses, CNRS-Université Grenoble Alpes-UPS-INSA-EMFL, 38042 Grenoble, France
| | - H Mayaffre
- Laboratoire National des Champs Magnétiques Intenses, CNRS-Université Grenoble Alpes-UPS-INSA-EMFL, 38042 Grenoble, France
| | - S Krämer
- Laboratoire National des Champs Magnétiques Intenses, CNRS-Université Grenoble Alpes-UPS-INSA-EMFL, 38042 Grenoble, France
| | - M Horvatić
- Laboratoire National des Champs Magnétiques Intenses, CNRS-Université Grenoble Alpes-UPS-INSA-EMFL, 38042 Grenoble, France
| | - C Berthier
- Laboratoire National des Champs Magnétiques Intenses, CNRS-Université Grenoble Alpes-UPS-INSA-EMFL, 38042 Grenoble, France
| | - A P Reyes
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
| | - P L Kuhns
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
| | - R Liang
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
- Canadian Institute for Advanced Research, Toronto M5G 1Z8, Canada
| | - W N Hardy
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
- Canadian Institute for Advanced Research, Toronto M5G 1Z8, Canada
| | - D A Bonn
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
- Canadian Institute for Advanced Research, Toronto M5G 1Z8, Canada
| | - M-H Julien
- Laboratoire National des Champs Magnétiques Intenses, CNRS-Université Grenoble Alpes-EMFL, 38042 Grenoble, France
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14
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Moulla Y, Krämer S. skip-Phänomen im Lymphknotenmetastasierungsweg bei Nichtkleinzelligem Bronchialkarzinom. Pneumologie 2016; 70:826-830. [PMID: 27931068 DOI: 10.1055/s-0036-1596073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Y Moulla
- Klinik für Viszeral-, Transplantations-, Thorax- und Gefäßchirurgie; Universitätsklinikum Leipzig AöR
| | - S Krämer
- Klinik für Viszeral-, Transplantations-, Thorax- und Gefäßchirurgie; Universitätsklinikum Leipzig AöR
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15
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Garbacz P, Fischer P, Krämer S. A loop-gap resonator for chirality-sensitive nuclear magneto-electric resonance (NMER). J Chem Phys 2016; 145:104201. [DOI: 10.1063/1.4962285] [Citation(s) in RCA: 6] [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] [Indexed: 01/12/2023] Open
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16
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Jeong M, Schmidiger D, Mayaffre H, Klanjšek M, Berthier C, Knafo W, Ballon G, Vignolle B, Krämer S, Zheludev A, Horvatić M. Dichotomy between Attractive and Repulsive Tomonaga-Luttinger Liquids in Spin Ladders. Phys Rev Lett 2016; 117:106402. [PMID: 27636483 DOI: 10.1103/physrevlett.117.106402] [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: 04/15/2016] [Indexed: 06/06/2023]
Abstract
We present a direct NMR method to determine whether the interactions in a Tomonaga-Luttinger liquid (TLL) state of a spin-1/2 Heisenberg antiferromagnetic ladder are attractive or repulsive. For the strong-leg spin ladder compound (C_{7}H_{10}N)_{2}CuBr_{4} we find that the isothermal magnetic field dependence of the NMR relaxation rate T_{1}^{-1}(H) displays a concave curve between the two critical fields bounding the TLL regime. This is in sharp contrast to the convex curve previously reported for a strong-rung ladder, (C_{5}H_{12}N)_{2}CuBr_{4}. We show that the concavity and the convexity of T_{1}^{-1}(H), which is a fingerprint of spin fluctuations, directly reflect the attractive and repulsive fermionic interactions in the TLL, respectively. The interaction sign is alternatively determined from an indirect method combining bulk magnetization and specific heat data.
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Affiliation(s)
- M Jeong
- Laboratoire National des Champs Magnétique Intenses, LNCMI-CNRS (UPR3228), UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
- Laboratory for Quantum Magnetism, Institute of Physics, Ecole Polytechnique Féderale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - D Schmidiger
- Neutron Scattering and Magnetism, Laboratory for Solid State Physics, ETH, 8093 Zürich, Switzerland
| | - H Mayaffre
- Laboratoire National des Champs Magnétique Intenses, LNCMI-CNRS (UPR3228), UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
| | - M Klanjšek
- Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
| | - C Berthier
- Laboratoire National des Champs Magnétique Intenses, LNCMI-CNRS (UPR3228), UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
| | - W Knafo
- Laboratoire National des Champs Magnétique Intenses, LNCMI-CNRS (UPR3228), UGA, UPS, and INSA, 31400 Toulouse, France
| | - G Ballon
- Laboratoire National des Champs Magnétique Intenses, LNCMI-CNRS (UPR3228), UGA, UPS, and INSA, 31400 Toulouse, France
| | - B Vignolle
- Laboratoire National des Champs Magnétique Intenses, LNCMI-CNRS (UPR3228), UGA, UPS, and INSA, 31400 Toulouse, France
| | - S Krämer
- Laboratoire National des Champs Magnétique Intenses, LNCMI-CNRS (UPR3228), UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
| | - A Zheludev
- Neutron Scattering and Magnetism, Laboratory for Solid State Physics, ETH, 8093 Zürich, Switzerland
| | - M Horvatić
- Laboratoire National des Champs Magnétique Intenses, LNCMI-CNRS (UPR3228), UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
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17
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Palisson F, Yubero M, Ampuero A, McNab M, Fuentes I, Gonzalez S, Krämer S, Morandé P, Anguita T, Mora X, Gana M, Conget P. LB778 Intravenous administration of allogeneic Mesenchymal Stromal Cells as a treatment for patients with severe generalized Recessive Dystrophic Epidermolysis Bullosa. J Invest Dermatol 2016. [DOI: 10.1016/j.jid.2016.05.028] [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: 10/21/2022]
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18
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Mallmann P, Krämer S. Kongressbericht. 212. Tagung der NWGGG. Geburtshilfe Frauenheilkd 2015. [DOI: 10.1055/s-0035-1557927] [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: 10/23/2022] Open
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19
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Ulhaas A, Malter W, Krämer S, Mallmann P, Maintz D, Krug KB. MRT-gesteuerte Vakuumbiopsien (VAB) der Mamma an einem 1.0 T Tomographen: Einfluss klinischer, sowie Läsionscharakteristika auf den Interventionsprozess und das klinische Outcome. Geburtshilfe Frauenheilkd 2015. [DOI: 10.1055/s-0035-1560002] [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: 10/23/2022] Open
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20
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Kirn V, Malter W, Hamacher S, Schmidt M, Markiefka B, Krämer S, Mallmann P. Prädiktoren für den Befall des Sentinel-Lymphknotens bei der operativen Therapie des Mammakarzinoms in der adjuvanten Situation: Radioaktivität und Ki67. Geburtshilfe Frauenheilkd 2015. [DOI: 10.1055/s-0035-1560015] [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: 10/23/2022] Open
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21
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Rogée K, Krämer S, Malter W, Richters L, Mallmann P. Onkoplastische brusterhaltende Mammachirurgie – Lernbarkeit der Operationsmethoden im Rahmen der Facharztausbildung Gynäkologie/Geburtshilfe. Geburtshilfe Frauenheilkd 2015. [DOI: 10.1055/s-0035-1560001] [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: 10/23/2022] Open
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22
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Puppe J, van Ooyen D, Neise J, Thangarajah F, Eichler C, Pfister R, Krämer S, Mallmann P, Wirtz M, Michels G. Prospective evaluation of cardiac safety in breast cancer patients after adjuvant treatment with epirubicin, cyclophosphamide, doxetaxel and with or without trastuzumab: A single center experience. Geburtshilfe Frauenheilkd 2015. [DOI: 10.1055/s-0035-1560003] [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: 10/23/2022] Open
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23
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Kirn V, Enninga I, Thangarajah F, Clement L, Richters L, Malter W, Markiefka B, Krämer S, Mallmann P. Der Proliferationsmarker Ki-67 und seine prognostische Bedeutung: Retrospektive Analyse von Mammakarzinom-Patientinnen an der Unifrauenklinik Köln. Geburtshilfe Frauenheilkd 2015. [DOI: 10.1055/s-0035-1560011] [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: 10/23/2022] Open
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24
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Malter W, Kirn V, Fridrich C, Paul L, Krämer S, Mallmann P. Verbesserung des Durchblutungsmonitorings durch Indocyaningrün (ICG) bei onkoplastischen und ästhetischen Mammaoperationen. Geburtshilfe Frauenheilkd 2015. [DOI: 10.1055/s-0035-1559999] [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: 10/23/2022] Open
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25
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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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26
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Friedrich M, Krämer S, Terjung A. Principles of reconstruction with tissue expanders as immediate reconstruction after mastectomy for breast cancer. EUR J GYNAECOL ONCOL 2015; 36:103-106. [PMID: 26050343] [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: 06/04/2023]
Abstract
The aim of reconstruction with expanders is to restore breast shape and volume as close as possible to the contralateral breast and to reconstruct the inframammary fold with adequate ptosis.
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27
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Guthausen G, Machado JR, Luy B, Baniodeh A, Powell AK, Krämer S, Ranzinger F, Herrling MP, Lackner S, Horn H. Characterisation and application of ultra-high spin clusters as magnetic resonance relaxation agents. Dalton Trans 2015; 44:5032-40. [DOI: 10.1039/c4dt02916j] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly paramagnetic coordination clusters with a {Fe10Ln10} core are used as NMR relaxation agents with a first application in a biofilm study.
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Machado JR, Baniodeh A, Powell AK, Luy B, Krämer S, Guthausen G. Nuclear magnetic resonance relaxivities: investigations of ultrahigh-spin lanthanide clusters from 10 MHz to 1.4 GHz. Chemphyschem 2014; 15:3608-13. [PMID: 25115895 DOI: 10.1002/cphc.201402318] [Citation(s) in RCA: 10] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Indexed: 11/08/2022]
Abstract
Paramagnetic relaxation enhancement is often explored in magnetic resonance imaging in terms of contrast agents and in biomolecular nuclear magnetic resonance (NMR) spectroscopy for structure determination. New ultrahigh-spin clusters are investigated with respect to their NMR relaxation properties. As their molecular size and therefore motional correlation times as well as their electronic properties differ significantly from those of conventional contrast agents, questions about a comprehensive characterization arise. The relaxivity was studied by field-dependent longitudinal and transverse NMR relaxometry of aqueous solutions containing Fe(III)(10)Dy(III)(10) ultrahigh-spin clusters (spin ground state 100/2). The high-field limit was extended to 32.9 T by using a 24 MW resistive magnet and an ultrahigh-frequency NMR setup. Interesting relaxation dispersions were observed; the relaxivities increase up to the highest available fields, which indicates a complex interplay of electronic and molecular correlation times.
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Affiliation(s)
- Julyana R Machado
- Pro2NMR at the Institute -for Biological Interfaces, Karlsruhe Institute of Technology, Adenauerring 20b, 76131 Karlsruhe (Germany)
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30
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Kirn V, Malter W, Hamacher S, Schmidt M, Markiefka B, Richters L, Fridrich C, Mallmann P, Krämer S. Prädiktoren für den Befall des Sentinel-LK bei der operativen Therapie des Mammakarzinoms: Radioaktivität und Ki67. Geburtshilfe Frauenheilkd 2014. [DOI: 10.1055/s-0034-1388428] [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: 10/24/2022] Open
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31
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Malter W, Kirn V, Semrau R, Bongartz R, Markiefka B, Mallmann P, Krämer S. Update of single institution experiences with intraoperative radiotherapy (IORT) in targeted oncoplastic breast surgery. Geburtshilfe Frauenheilkd 2014. [DOI: 10.1055/s-0034-1388456] [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: 10/24/2022] Open
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32
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Krämer S, Malter W, Fridrich C, Kirn V, Richters L, Mallmann P. Targeted oncoplastic breast surgery (TOBS) – classification of breast-conserving techniques. Geburtshilfe Frauenheilkd 2014. [DOI: 10.1055/s-0034-1388429] [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: 10/24/2022] Open
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Krauß K, Gluz O, Kümmel S, Schumann RV, Nuding B, Schumacher C, Maass N, Rezai M, Braun M, Aktas B, Forstbauer H, Kusche M, Krämer S, der Assen AV, Kreipe H, Christgen M, Hofmann D, Kates R, Shak S, Würstlein R, Nitz U, Harbeck N. Oncotype DX® und Proliferationsänderung durch kurzzeitige präoperative endokrine Induktionstherapie zur Therapieentscheidung beim frühen Mammakarzinom: Biomarkerdaten aus der prospektiven multi-zentrischen Phase II/III WSG-ADAPT Studie. Geburtshilfe Frauenheilkd 2014. [DOI: 10.1055/s-0034-1388575] [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: 10/24/2022] Open
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Krug KB, Ulhaas A, Hellmich M, Krämer S, Schwabe H, Müller D, Markiefka B, Maintz D. Retrospektive Auswertung der von 2005 bis 2012 an einem offenen 1.0 Tesla MRT-Tomographen durchgeführten Federhaken-Markierungen der Mammae. ROFO-FORTSCHR RONTG 2014. [DOI: 10.1055/s-0034-1373179] [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: 10/25/2022]
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Grissonnanche G, Cyr-Choinière O, Laliberté F, René de Cotret S, Juneau-Fecteau A, Dufour-Beauséjour S, Delage MÈ, LeBoeuf D, Chang J, Ramshaw BJ, Bonn DA, Hardy WN, Liang R, Adachi S, Hussey NE, Vignolle B, Proust C, Sutherland M, Krämer S, Park JH, Graf D, Doiron-Leyraud N, Taillefer L. Direct measurement of the upper critical field in cuprate superconductors. Nat Commun 2014; 5:3280. [PMID: 24518054 PMCID: PMC3929805 DOI: 10.1038/ncomms4280] [Citation(s) in RCA: 147] [Impact Index Per Article: 14.7] [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: 08/13/2013] [Accepted: 01/19/2014] [Indexed: 11/08/2022] Open
Abstract
In the quest to increase the critical temperature Tc of cuprate superconductors, it is essential to identify the factors that limit the strength of superconductivity. The upper critical field Hc2 is a fundamental measure of that strength, yet there is no agreement on its magnitude and doping dependence in cuprate superconductors. Here we show that the thermal conductivity can be used to directly detect Hc2 in the cuprates YBa2Cu3Oy, YBa2Cu4O8 and Tl2Ba2CuO6+δ, allowing us to map out Hc2 across the doping phase diagram. It exhibits two peaks, each located at a critical point where the Fermi surface of YBa2Cu3Oy is known to undergo a transformation. Below the higher critical point, the condensation energy, obtained directly from Hc2, suffers a sudden 20-fold collapse. This reveals that phase competition-associated with Fermi-surface reconstruction and charge-density-wave order-is a key limiting factor in the superconductivity of cuprates.
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Affiliation(s)
- G. Grissonnanche
- Département de physique & RQMP, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1
| | - O. Cyr-Choinière
- Département de physique & RQMP, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1
| | - F. Laliberté
- Département de physique & RQMP, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1
| | - S. René de Cotret
- Département de physique & RQMP, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1
| | - A. Juneau-Fecteau
- Département de physique & RQMP, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1
| | - S. Dufour-Beauséjour
- Département de physique & RQMP, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1
| | - M. -È. Delage
- Département de physique & RQMP, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1
| | - D. LeBoeuf
- Département de physique & RQMP, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1
- Present address: Laboratoire National des Champs Magnétiques Intenses, Grenoble, France
| | - J. Chang
- Département de physique & RQMP, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1
- Present address: École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - B. J. Ramshaw
- Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
| | - D. A. Bonn
- Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
- Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G 1Z8
| | - W. N. Hardy
- Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
- Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G 1Z8
| | - R. Liang
- Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
- Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G 1Z8
| | - S. Adachi
- Superconductivity Research Laboratory, ISTEC, Yokohama, Kanagawa 223-0051, Japan
| | - N. E. Hussey
- H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK
- Present address: High Field Magnet Laboratory, Radboud University Nijmegen, The Netherlands
| | - B. Vignolle
- Laboratoire National des Champs Magnétiques Intenses, Toulouse 31400, France
| | - C. Proust
- Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G 1Z8
- Laboratoire National des Champs Magnétiques Intenses, Toulouse 31400, France
| | - M. Sutherland
- Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK
| | - S. Krämer
- Laboratoire National des Champs Magnétiques Intenses, Grenoble, France
| | - J. -H. Park
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
| | - D. Graf
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
| | - N. Doiron-Leyraud
- Département de physique & RQMP, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1
| | - Louis Taillefer
- Département de physique & RQMP, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1
- Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G 1Z8
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Wu T, Mayaffre H, Krämer S, Horvatić M, Berthier C, Kuhns PL, Reyes AP, Liang R, Hardy WN, Bonn DA, Julien MH. Emergence of charge order from the vortex state of a high-temperature superconductor. Nat Commun 2013; 4:2113. [PMID: 23820931 DOI: 10.1038/ncomms3113] [Citation(s) in RCA: 201] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Accepted: 06/05/2013] [Indexed: 11/09/2022] Open
Abstract
Evidence is mounting that charge order competes with superconductivity in high Tc cuprates. Whether this has any relationship to the pairing mechanism is unknown as neither the universality of the competition nor its microscopic nature has been established. Here, we show using nuclear magnetic resonance that charge order in YBa2Cu3Oy has maximum strength inside the superconducting dome, similar to compounds of the La2-x(Sr,Ba)xCuO4 family. In YBa2Cu3Oy, this occurs at doping levels of p=0.11-0.12. We further show that the overlap of halos of incipient charge order around vortex cores, similar to those visualised in Bi2Sr2CaCu2O8+δ, can explain the threshold magnetic field at which long-range charge order emerges. These results reveal universal features of a competition in which charge order and superconductivity appear as joint instabilities of the same normal state, whose relative balance can be field-tuned in the vortex state.
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Affiliation(s)
- Tao Wu
- Laboratoire National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA, Grenoble, France
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Krämer S, Meyer H, O'Loughlin PF, Vaske B, Krettek C, Gaulke R. The incidence of ulnocarpal complaints after distal radial fracture in relation to the fracture of the ulnar styloid. J Hand Surg Eur Vol 2013; 38:710-7. [PMID: 23221179 DOI: 10.1177/1753193412469582] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Two hundred distal radial fractures, with a mean follow up of 20 months (range 6-49), were divided into three groups according to the presence and healing status of an ulnar styloid fracture. The patients underwent both clinical and radiological examination and completed two different questionnaires. One hundred and one, of 200 distal radial fractures, were associated with an ulnar styloid fracture. Forty-six of these developed an ulnar styloid nonunion. The authors encountered significantly higher pain scores (ulnar sided pain p = 0.012), a higher rate of DRUJ instability (p = 0.032), a greater loss of motion and grip strength (p = 0.001), and a poorer clinical outcome in cases with an ulnar styloid fracture, but no differences were apparent when those with healed ulnar styloid fractures or ulnar styloid nonunions were compared (p > 0.05). The investigators propose that the incidence of ulnocarpal complaints following distal radial fracture depends on the presence but not the healing status of an ulnar styloid fracture.
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Affiliation(s)
- S Krämer
- Klinik für Unfallchirurgie, Medizinische Hochschule, Hannover 30173, Germany.
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Grbić MS, Krämer S, Berthier C, Trousselet F, Cépas O, Tanaka H, Horvatić M. Microscopic properties of the pinwheel kagome compound Rb(2)Cu(3)SnF(12). Phys Rev Lett 2013; 110:247203. [PMID: 25165957 DOI: 10.1103/physrevlett.110.247203] [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: 11/05/2012] [Revised: 03/31/2013] [Indexed: 06/03/2023]
Abstract
Using (63,65)Cu nuclear magnetic resonance in magnetic fields up to 30 T, we study the microscopic properties of the 12-site valence-bond-solid ground state in the "pinwheel" kagome compound Rb(2)Cu(3)SnF(12). We find that the ground state is characterized by a strong transverse staggered spin polarization whose temperature and field dependence points to a mixing of the singlet and triplet states. This is further corroborated by the field dependence of the gap Δ(H), which has a level anticrossing with a large minimum gap value of ≈ Δ(0)/2, with no evidence of a phase transition down to 1.5 K. By the exact diagonalization of small clusters, we show that the observed anticrossing is mainly due to staggered tilts of the g tensors defined by the crystal structure and reveal symmetry properties of the low-energy excitation spectrum compatible with the absence of level crossing.
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Affiliation(s)
- M S Grbić
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), UJF, UPS, and INSA, BP 166, 38042 Grenoble Cedex 9, France and Department of Physics, Faculty of Science, University of Zagreb, P.O. Box 331, HR-10002 Zagreb, Croatia
| | - S Krämer
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), UJF, UPS, and INSA, BP 166, 38042 Grenoble Cedex 9, France
| | - C Berthier
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), UJF, UPS, and INSA, BP 166, 38042 Grenoble Cedex 9, France
| | - F Trousselet
- Institut Néel, CNRS and Université Joseph Fourier, BP 166, 38042 Grenoble Cedex 9, France
| | - O Cépas
- Institut Néel, CNRS and Université Joseph Fourier, BP 166, 38042 Grenoble Cedex 9, France
| | - H Tanaka
- Department of Physics, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan
| | - M Horvatić
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), UJF, UPS, and INSA, BP 166, 38042 Grenoble Cedex 9, France
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Casola F, Shiroka T, Feiguin A, Wang S, Grbić MS, Horvatić M, Krämer S, Mukhopadhyay S, Conder K, Berthier C, Ott HR, Rønnow HM, Rüegg C, Mesot J. Field-induced quantum soliton lattice in a frustrated two-leg spin-1/2 ladder. Phys Rev Lett 2013; 110:187201. [PMID: 23683239 DOI: 10.1103/physrevlett.110.187201] [Citation(s) in RCA: 3] [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: 11/27/2012] [Indexed: 06/02/2023]
Abstract
Based on high-field (31)P nuclear magnetic resonance experiments and accompanying numerical calculations, it is argued that in the frustrated S=1/2 ladder compound BiCu(2)PO(6) a field-induced soliton lattice develops above a critical field of μ(0)H(c1)=20.96(7) T. Solitons result from the fractionalization of the S=1, bosonlike triplet excitations, which in other quantum antiferromagnets are commonly known to experience Bose-Einstein condensation or to crystallize in a superstructure. Unlike in spin-Peierls systems, these field-induced quantum domain walls do not arise from a state with broken translational symmetry and are triggered exclusively by magnetic frustration. Our model predicts yet another second-order phase transition at H(c2)>H(c1), driven by soliton-soliton interactions, most likely corresponding to the one observed in recent magnetocaloric and other bulk measurements.
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Affiliation(s)
- F Casola
- Laboratorium für Festkörperphysik, ETH Hönggerberg, CH-8093 Zürich, Switzerland.
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Takigawa M, Horvatić M, Waki T, Krämer S, Berthier C, Lévy-Bertrand F, Sheikin I, Kageyama H, Ueda Y, Mila F. Incomplete devil's staircase in the magnetization curve of SrCu2(BO3)2. Phys Rev Lett 2013; 110:067210. [PMID: 23432305 DOI: 10.1103/physrevlett.110.067210] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Indexed: 06/01/2023]
Abstract
We report on NMR and torque measurements on the frustrated quasi-two-dimensional spin-dimer system SrCu(2)(BO(3))(2) in magnetic fields up to 34 T that reveal a sequence of magnetization plateaus at 1/8, 2/15, 1/6, and 1/4 of the saturation and two incommensurate phases below and above the 1/6 plateau. The magnetic structures determined by NMR involve a stripe order of triplets in all plateaus, suggesting that the incommensurate phases originate from proliferation of domain walls. We propose that the magnetization process of SrCu(2)(BO(3))(2) is best described as an incomplete devil's staircase.
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Affiliation(s)
- M Takigawa
- Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.
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Krämer S. Advanced Process Control - Beyond Single Loop Control. Von C. L. Smith. CHEM-ING-TECH 2012. [DOI: 10.1002/cite.201290086] [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: 11/07/2022]
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Krämer S. [250 years percussion - a pioneering examination method]. Dtsch Med Wochenschr 2011; 136:2696-8. [PMID: 22169926 DOI: 10.1055/s-0031-1292825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Wu T, Mayaffre H, Krämer S, Horvatić M, Berthier C, Hardy WN, Liang R, Bonn DA, Julien MH. Magnetic-field-induced charge-stripe order in the high-temperature superconductor YBa2Cu3Oy. Nature 2011; 477:191-4. [PMID: 21901009 DOI: 10.1038/nature10345] [Citation(s) in RCA: 169] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2011] [Accepted: 07/01/2011] [Indexed: 11/10/2022]
Abstract
Electronic charges introduced in copper-oxide (CuO(2)) planes generate high-transition-temperature (T(c)) superconductivity but, under special circumstances, they can also order into filaments called stripes. Whether an underlying tendency towards charge order is present in all copper oxides and whether this has any relationship with superconductivity are, however, two highly controversial issues. To uncover underlying electronic order, magnetic fields strong enough to destabilize superconductivity can be used. Such experiments, including quantum oscillations in YBa(2)Cu(3)O(y) (an extremely clean copper oxide in which charge order has not until now been observed) have suggested that superconductivity competes with spin, rather than charge, order. Here we report nuclear magnetic resonance measurements showing that high magnetic fields actually induce charge order, without spin order, in the CuO(2) planes of YBa(2)Cu(3)O(y). The observed static, unidirectional, modulation of the charge density breaks translational symmetry, thus explaining quantum oscillation results, and we argue that it is most probably the same 4a-periodic modulation as in stripe-ordered copper oxides. That it develops only when superconductivity fades away and near the same 1/8 hole doping as in La(2-x)Ba(x)CuO(4) (ref. 1) suggests that charge order, although visibly pinned by CuO chains in YBa(2)Cu(3)O(y), is an intrinsic propensity of the superconducting planes of high-T(c) copper oxides.
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Affiliation(s)
- Tao Wu
- Laboratoire National des Champs Magnétiques Intenses, UPR 3228, CNRS-UJF-UPS-INSA, 38042 Grenoble, France
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Krämer S, Wenk M, Fischer G, Möllmann M, Pöpping DM. Continuous spinal anesthesia versus continuous femoral nerve block for elective total knee replacement. Minerva Anestesiol 2011; 77:394-400. [PMID: 21483383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
BACKGROUND Continuous spinal analgesia (CSA) and continuous femoral nerve blockade (CFNB) are well-established procedures for postoperative pain relief. This study compares the efficacy, adverse effects and complications associated with these two analgesic methods in patients undergoing total knee arthroplasty (TKA). METHODS Data were analyzed from consecutive patients undergoing TKA under either CSA or spinal anesthesia plus CFNB. Quality of analgesia was assessed based on opioid consumption and pain intensity (visual analogue scale [VAS] where 0=no pain and 10=utmost imaginable pain) until postoperative day 4. In addition, joint mobility was assessed, and any adverse reactions or side effects were noted. RESULTS Sixty-two patients had satisfactory postoperative pain relief, and maximum pain scores were reported between 12 and 24 hrs. Median pain scores in the CSA group were significantly lower than those in the CFNB group (1.0 [0.9-1.9] vs. 2.0 [1.5-3.6] for resting pain and 2.0 [1.7-3.1] vs. 5.0 [3.0-5.5] for dynamic pain, respectively; P<0.001 for days 0 and 1; P<0.05 for all other days). Piritramide consumption was significantly higher in the CFNB group (P<0.01). There were no significant differences between the groups for postoperative mobility of the joint or patient satisfaction. CONCLUSION Both methods demonstrated analgesic efficacy after total knee arthroplasty, although there was less pain severity and opioid consumption use reported with continuous spinal analgesia. However, the use of continuous spinal analgesia is limited by concerns about the risk profile and absence of approved devices for continuous intrathecal infusion.
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Affiliation(s)
- S Krämer
- Department of Anesthesiology and Intensive Care, St. Franziskus Hospital Münster, Germany
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Werlin R, Priester JH, Mielke RE, Krämer S, Jackson S, Stoimenov PK, Stucky GD, Cherr GN, Orias E, Holden PA. Biomagnification of cadmium selenide quantum dots in a simple experimental microbial food chain. Nat Nanotechnol 2011; 6:65-71. [PMID: 21170041 DOI: 10.1038/nnano.2010.251] [Citation(s) in RCA: 147] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2010] [Accepted: 11/17/2010] [Indexed: 05/30/2023]
Abstract
Previous studies have shown that engineered nanomaterials can be transferred from prey to predator, but the ecological impacts of this are mostly unknown. In particular, it is not known if these materials can be biomagnified-a process in which higher concentrations of materials accumulate in organisms higher up in the food chain. Here, we show that bare CdSe quantum dots that have accumulated in Pseudomonas aeruginosa bacteria can be transferred to and biomagnified in the Tetrahymena thermophila protozoa that prey on the bacteria. Cadmium concentrations in the protozoa predator were approximately five times higher than their bacterial prey. Quantum-dot-treated bacteria were differentially toxic to the protozoa, in that they inhibited their own digestion in the protozoan food vacuoles. Because the protozoa did not lyse, largely intact quantum dots remain available to higher trophic levels. The observed biomagnification from bacterial prey is significant because bacteria are at the base of environmental food webs. Our findings illustrate the potential for biomagnification as an ecological impact of nanomaterials.
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Affiliation(s)
- R Werlin
- Department of Molecular, Cellular and Developmental Biology, University of California, Santa Barbara, California 93106-9625, USA
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Kern P, Darsow M, Krämer S, Rezai M. Onkoplastik nach neoadjuvanter Therapie des Mammakarzinoms. Geburtshilfe Frauenheilkd 2010. [DOI: 10.1055/s-0030-1269943] [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: 10/18/2022] Open
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47
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Kern P, Darsow M, Rezai M, Krämer S. Adjuvante Strahlentherapie und Brustrekonstruktion – was müssen wir beachten? Geburtshilfe Frauenheilkd 2010. [DOI: 10.1055/s-0030-1269949] [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: 10/18/2022] Open
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48
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Krämer S, Kern P, Darsow M, Rezai M. Skin-Sparing Mastektomie und Implantatrekonstruktion. Geburtshilfe Frauenheilkd 2010. [DOI: 10.1055/s-0030-1269951] [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: 10/18/2022] Open
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49
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Krämer S, Darsow M, Kern P, Rezai M. Systematik der onkoplastischen Brustchirurgie. Geburtshilfe Frauenheilkd 2010. [DOI: 10.1055/s-0030-1269945] [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: 10/18/2022] Open
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50
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Rezai M, Darsow M, Kern P, Krämer S. Autologe Brustrekonstruktion mit dem TRAM-Lappen – eine veraltete Technik? Geburtshilfe Frauenheilkd 2010. [DOI: 10.1055/s-0030-1269953] [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: 10/18/2022] Open
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