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Shimojima T, Nakamura A, Ishizaka K. Development and applications ofultrafast transmission electron microscopy. Microscopy (Oxf) 2023:7085678. [PMID: 36961742 DOI: 10.1093/jmicro/dfad021] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 03/07/2023] [Accepted: 03/23/2023] [Indexed: 03/25/2023] Open
Abstract
We present a review on the development and applications of the ultrafast transmission electron microscopy (UTEM) at RIKEN. We introduce the UTEM system for the pump-probe TEM observation in a wide temporal range. By combining the UTEM and pixelated detector, we further develop five-dimansional scanning TEM (5D STEM) which provides the ultrafast nanoscale movie of physical quantities in nano-materials, such as crystal lattice information and electromagnetic field, by convergent-beam electron diffraction (CBED) and differential phase contrast (DPC) imaging technique. We show our recent results on the nanosecond-to-microsecond magnetic skyrmion dynamics observed by Lorentz TEM (LTEM) and photo-induced acoustic wave generation in picosecond regime by bright-field TEM and electron diffraction measurements by UTEM. We also show the demonstartion of the 5D STEM on the quantitative time (t)-dependent strain mapping by CBED with an accuracy of 4 ps and 8 nm, and the ultrafast demagnetization under zero magnetic field observed by DPC with 10 ns and 400 nm resolution.
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Affiliation(s)
- T Shimojima
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - A Nakamura
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - K Ishizaka
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
- Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
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2
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Shimojima T, Nakamura A, Ishizaka K. Development of five-dimensional scanning transmission electron microscopy. Rev Sci Instrum 2023; 94:023705. [PMID: 36859021 DOI: 10.1063/5.0106517] [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: 06/28/2022] [Accepted: 01/13/2023] [Indexed: 06/18/2023]
Abstract
By combining the scanning transmission electron microscopy with the ultrafast optical pump-probe technique, we improved the time resolution by a factor of ∼1012 for the differential phase contrast and convergent-beam electron diffraction imaging. These methods provide ultrafast nanoscale movies of physical quantities in nano-materials, such as crystal lattice deformation, magnetization vector, and electric field. We demonstrate the observations of the photo-induced acoustic phonon propagation with an accuracy of 4 ps and 8 nm and the ultrafast demagnetization under zero magnetic field with 10 ns and 400 nm resolution, by utilizing these methods.
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Affiliation(s)
- T Shimojima
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - A Nakamura
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - K Ishizaka
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
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3
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Abstract
Ultrafast optical control of strain is crucial for the future development of nanometric acoustic devices. Although ultrafast electron microscopy has played an important role in the visualization of strain dynamics in the GHz frequency region, quantitative strain evaluation with nm × ps spatio-temporal resolution is still challenging. Five-dimensional scanning transmission electron microscopy (5D-STEM) is a powerful technique that measures time-dependent diffraction or deflection of the electron beam at the respective two-dimensional sample positions in real space. In this paper, we demonstrate that convergent beam electron diffraction (CBED) measurements using 5D-STEM are capable of quantitative time-dependent strain mapping in the nm × ps scale. We observe the generation and propagation of acoustic waves in a nanofabricated silicon thin plate of 100 nm thickness. The polarization and amplitude of the acoustic waves propagating in the silicon plate are quantitatively determined from the CBED analysis. Further Fourier-transformation analysis reveals the strain distribution in the momentum-frequency space, which gives the dispersion relation in arbitrary directions along the plate. Versatility of 5D-STEM-CBED analysis enables quantitative strain mapping even in complex nanofabricated samples, as demonstrated in this study.
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Affiliation(s)
- A Nakamura
- RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan.
| | - T Shimojima
- RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan.
| | - K Ishizaka
- RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan. .,Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
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4
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Shimojima T, Motoyui Y, Taniuchi T, Bareille C, Onari S, Kontani H, Nakajima M, Kasahara S, Shibauchi T, Matsuda Y, Shin S. Discovery of mesoscopic nematicity wave in iron-based superconductors. Science 2021; 373:1122-1125. [PMID: 34516833 DOI: 10.1126/science.abd6701] [Citation(s) in RCA: 6] [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: 11/02/2022]
Abstract
[Figure: see text].
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Affiliation(s)
- T Shimojima
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - Y Motoyui
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa 277-8581, Japan
| | - T Taniuchi
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa 277-8581, Japan.,Material Innovation Research Center (MIRC), The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - C Bareille
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa 277-8581, Japan.,Material Innovation Research Center (MIRC), The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - S Onari
- Department of Physics, Nagoya University, Furo-cho, Nagoya 464-8602, Japan
| | - H Kontani
- Department of Physics, Nagoya University, Furo-cho, Nagoya 464-8602, Japan
| | - M Nakajima
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - S Kasahara
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - T Shibauchi
- Department of Advanced Materials Science, The University of Tokyo, Kashiwa 277-8561, Japan
| | - Y Matsuda
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - S Shin
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa 277-8581, Japan.,Material Innovation Research Center (MIRC), The University of Tokyo, Kashiwa, Chiba 277-8561, Japan.,Office of University Professor, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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5
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Nakamura A, Shimojima T, Ishizaka K. Finite-element simulation of photoinduced strain dynamics in silicon thin plates. Struct Dyn 2021; 8:024103. [PMID: 33907699 PMCID: PMC8051961 DOI: 10.1063/4.0000059] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 03/29/2021] [Indexed: 11/14/2022]
Abstract
In this paper, we investigate the femtosecond-optical-pulse-induced strain dynamics in relatively thin (100 nm) and thick (10 000 nm) silicon plates based on finite-element simulations. In the thin sample, almost spatially homogeneous excitation by the optical pulse predominantly generates a standing wave of the lowest-order acoustic resonance mode along the out-of-plane direction. At the same time, laterally propagating plate waves are emitted at the sample edge through the open edge deformation. Fourier transformation analysis reveals that the plate waves in the thin sample are mainly composed of two symmetric Lamb waves, reflecting the spatially uniform photoexcitation. In the thick sample, on the other hand, only the near surface region is photo-excited and thus a strain pulse that propagates along the out-of-plane direction is generated, accompanying the laterally propagating pulse-like strain dynamics through the edge deformation. These lateral strain pulses consist of multiple Lamb waves, including asymmetric and higher-order symmetric modes. Our simulations quantitatively demonstrate the out-of-plane and in-plane photoinduced strain dynamics in realistic silicon plates, ranging from the plate wave form to pulse trains, depending on material parameters such as sample thickness, optical penetration depth, and sound velocity.
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Affiliation(s)
- A. Nakamura
- RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan
| | - T. Shimojima
- RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan
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6
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Mitsuishi N, Sugita Y, Bahramy MS, Kamitani M, Sonobe T, Sakano M, Shimojima T, Takahashi H, Sakai H, Horiba K, Kumigashira H, Taguchi K, Miyamoto K, Okuda T, Ishiwata S, Motome Y, Ishizaka K. Switching of band inversion and topological surface states by charge density wave. Nat Commun 2020; 11:2466. [PMID: 32424170 PMCID: PMC7235022 DOI: 10.1038/s41467-020-16290-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [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: 10/02/2019] [Accepted: 04/25/2020] [Indexed: 11/10/2022] Open
Abstract
Topologically nontrivial materials host protected edge states associated with the bulk band inversion through the bulk-edge correspondence. Manipulating such edge states is highly desired for developing new functions and devices practically using their dissipation-less nature and spin-momentum locking. Here we introduce a transition-metal dichalcogenide VTe2, that hosts a charge density wave (CDW) coupled with the band inversion involving V3d and Te5p orbitals. Spin- and angle-resolved photoemission spectroscopy with first-principles calculations reveal the huge anisotropic modification of the bulk electronic structure by the CDW formation, accompanying the selective disappearance of Dirac-type spin-polarized topological surface states that exist in the normal state. Thorough three dimensional investigation of bulk states indicates that the corresponding band inversion at the Brillouin zone boundary dissolves upon the CDW formation, by transforming into anomalous flat bands. Our finding provides a new insight to the topological manipulation of matters by utilizing CDWs' flexible characters to external stimuli.
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Affiliation(s)
- N Mitsuishi
- Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
- Quantum-Phase Electronics Center (QPEC), The University of Tokyo, Wako, 113-8656, Japan
| | - Y Sugita
- Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
| | - M S Bahramy
- Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
- Quantum-Phase Electronics Center (QPEC), The University of Tokyo, Wako, 113-8656, Japan
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan
| | - M Kamitani
- Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
- Quantum-Phase Electronics Center (QPEC), The University of Tokyo, Wako, 113-8656, Japan
| | - T Sonobe
- Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
- Quantum-Phase Electronics Center (QPEC), The University of Tokyo, Wako, 113-8656, Japan
| | - M Sakano
- Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
- Quantum-Phase Electronics Center (QPEC), The University of Tokyo, Wako, 113-8656, Japan
| | - T Shimojima
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan
| | - H Takahashi
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan
| | - H Sakai
- Department of Physics, Osaka University, Toyonaka, Osaka, 560-0043, Japan
| | - K Horiba
- Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan
| | - H Kumigashira
- Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan
| | - K Taguchi
- Hiroshima Synchrotron Radiation Center (HSRC), Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima, 739-0046, Japan
| | - K Miyamoto
- Hiroshima Synchrotron Radiation Center (HSRC), Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima, 739-0046, Japan
| | - T Okuda
- Hiroshima Synchrotron Radiation Center (HSRC), Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima, 739-0046, Japan
| | - S Ishiwata
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan
| | - Y Motome
- Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
| | - K Ishizaka
- Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan.
- Quantum-Phase Electronics Center (QPEC), The University of Tokyo, Wako, 113-8656, Japan.
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan.
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7
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Yoshioka K, Omachi J, Sakano M, Shimojima T, Ishizaka K, Kuwata-Gonokami M. Gigahertz-repetition-rate, narrowband-deep-ultraviolet light source for minimization of acquisition time in high-resolution angle-resolved photoemission spectroscopy. Rev Sci Instrum 2019; 90:123109. [PMID: 31893766 DOI: 10.1063/1.5124342] [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: 08/13/2019] [Accepted: 11/30/2019] [Indexed: 06/10/2023]
Abstract
Ultrahigh-repetition-rate (1.1 GHz), deep-ultraviolet coherent light at 208.8 nm is generated by applying an external Fabry-Pérot cavity for repetition-rate multiplication to the fourth harmonics of a 10-ps, mode-locked Ti:sapphire laser. Its small pulse energy minimizes the unwanted space charge effect, while its high repetition rate drastically reduces the acquisition time in high-energy resolution angle-resolved photoemission spectroscopy using hemispherical electron analyzers. The absence of the space charge effect in the photoemission spectrum near the Fermi edge of polycrystalline Au at 8 K demonstrates this idea.
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Affiliation(s)
- K Yoshioka
- Photon Science Center, School of Engineering, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
| | - J Omachi
- Photon Science Center, School of Engineering, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
| | - M Sakano
- Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - T Shimojima
- Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - K Ishizaka
- Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - M Kuwata-Gonokami
- Department of Physics, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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8
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Shimojima T, Suzuki Y, Nakamura A, Mitsuishi N, Kasahara S, Shibauchi T, Matsuda Y, Ishida Y, Shin S, Ishizaka K. Ultrafast nematic-orbital excitation in FeSe. Nat Commun 2019; 10:1946. [PMID: 31036846 PMCID: PMC6488589 DOI: 10.1038/s41467-019-09869-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [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: 06/23/2018] [Accepted: 03/30/2019] [Indexed: 11/24/2022] Open
Abstract
The electronic nematic phase is an unconventional state of matter that spontaneously breaks the rotational symmetry of electrons. In iron-pnictides/chalcogenides and cuprates, the nematic ordering and fluctuations have been suggested to have as-yet-unconfirmed roles in superconductivity. However, most studies have been conducted in thermal equilibrium, where the dynamical property and excitation can be masked by the coupling with the lattice. Here we use femtosecond optical pulse to perturb the electronic nematic order in FeSe. Through time-, energy-, momentum- and orbital-resolved photo-emission spectroscopy, we detect the ultrafast dynamics of electronic nematicity. In the strong-excitation regime, through the observation of Fermi surface anisotropy, we find a quick disappearance of the nematicity followed by a heavily-damped oscillation. This short-life nematicity oscillation is seemingly related to the imbalance of Fe 3dxz and dyz orbitals. These phenomena show critical behavior as a function of pump fluence. Our real-time observations reveal the nature of the electronic nematic excitation instantly decoupled from the underlying lattice. Several experiments have shown evidence for unusual nematic electronic behaviour in unconventional superconductors. Here the authors use pump-probe spectroscopy to observe out-of-equilibrium behaviour of coupled nematic-orbital excitations in iron selenide.
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Affiliation(s)
- T Shimojima
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan. .,Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan.
| | - Y Suzuki
- Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
| | - A Nakamura
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan.,Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
| | - N Mitsuishi
- Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
| | - S Kasahara
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
| | - T Shibauchi
- Department of Advanced Materials Science, The University of Tokyo, Kashiwa, 277-8561, Japan
| | - Y Matsuda
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
| | - Y Ishida
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, 277-8581, Japan
| | - S Shin
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, 277-8581, Japan
| | - K Ishizaka
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan.,Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
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9
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Sonobe T, Shimojima T, Nakamura A, Nakajima M, Uchida S, Kihou K, Lee CH, Iyo A, Eisaki H, Ohgushi K, Ishizaka K. Orbital-anisotropic electronic structure in the nonmagnetic state of BaFe 2(As 1-xP x ) 2 superconductors. Sci Rep 2018; 8:2169. [PMID: 29391431 PMCID: PMC5794914 DOI: 10.1038/s41598-018-20332-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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: 10/26/2017] [Accepted: 01/16/2018] [Indexed: 12/02/2022] Open
Abstract
High-temperature superconductivity in iron-pnictides/chalcogenides arises in balance with several electronic and lattice instabilities. Beside the antiferromagnetic order, the orbital anisotropy between Fe 3d xz and 3d yz occurs near the orthorhombic structural transition in several parent compounds. However, the extent of the survival of orbital anisotropy against the ion-substitution remains to be established. Here we report the composition (x) and temperature (T) dependences of the orbital anisotropy in the electronic structure of a BaFe2(As1-xP x )2 system by using angle-resolved photoemission spectroscopy. In the low-x regime, the orbital anisotropy starts to evolve on cooling from high temperatures above both antiferromagnetic and orthorhombic transitions. By increasing x, it is gradually suppressed and survives in the optimally doped regime. We find that the in-plane orbital anisotropy persists in a large area of the nonmagnetic phase, including the superconducting dome. These results suggest that the rotational symmetry-broken electronic state acts as the stage for superconductivity in BaFe2(As1-xP x )2.
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Affiliation(s)
- T Sonobe
- Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo, 113-8656, Japan
| | - T Shimojima
- Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo, 113-8656, Japan.
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan.
| | - A Nakamura
- Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo, 113-8656, Japan
| | - M Nakajima
- Department of Physics, Osaka University, Toyonaka, Osaka, 560-8531, Japan
| | - S Uchida
- Department of Physics, The University of Tokyo, Bunkyo, Tokyo, 113-0033, Japan
| | - K Kihou
- National Institute of Advanced Industrial Science and Technology, Tsukuba, 305-8568, Japan
| | - C H Lee
- National Institute of Advanced Industrial Science and Technology, Tsukuba, 305-8568, Japan
| | - A Iyo
- National Institute of Advanced Industrial Science and Technology, Tsukuba, 305-8568, Japan
| | - H Eisaki
- National Institute of Advanced Industrial Science and Technology, Tsukuba, 305-8568, Japan
| | - K Ohgushi
- Department of Physics, Tohoku University, Sendai, Miyagi, 980-8578, Japan
| | - K Ishizaka
- Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo, 113-8656, Japan
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan
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10
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Nakamura A, Shimojima T, Nakano M, Iwasa Y, Ishizaka K. Electron and lattice dynamics of transition metal thin films observed by ultrafast electron diffraction and transient optical measurements. Struct Dyn 2016; 3:064501. [PMID: 28004010 PMCID: PMC5148764 DOI: 10.1063/1.4971210] [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: 07/28/2016] [Accepted: 11/16/2016] [Indexed: 05/12/2023]
Abstract
We report the ultrafast dynamics of electrons and lattice in transition metal thin films (Au, Cu, and Mo) investigated by a combination of ultrafast electron diffraction (UED) and pump-probe optical methods. For a single-crystalline Au thin film, we observe the suppression of the diffraction intensity occuring in 10 ps, which direcly reflects the lattice thermalization via the electron-phonon interaction. By using the two-temperature model, the electron-phonon coupling constant (g) and the electron and lattice temperatures (Te, Tl) are evaluated from UED, with which we simulate the transient optical transmittance. The simulation well agrees with the experimentally obtained transmittance data, except for the slight deviations at the initial photoexcitation and the relaxed quasi-equilibrium state. We also present the results similarly obtained for polycrystalline Au, Cu, and Mo thin films and demonstrate the electron and lattice dynamics occurring in metals with different electron-phonon coupling strengths.
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Affiliation(s)
- A Nakamura
- Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo , Bunkyo, Tokyo 113-8656, Japan
| | - T Shimojima
- Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo , Bunkyo, Tokyo 113-8656, Japan
| | - M Nakano
- Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo , Bunkyo, Tokyo 113-8656, Japan
| | - Y Iwasa
- Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo , Bunkyo, Tokyo 113-8656, Japan
| | - K Ishizaka
- Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo , Bunkyo, Tokyo 113-8656, Japan
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11
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Umegaki H, Asai A, Kanda S, Maeda K, Shimojima T, Nomura H, Kuzuya M. Risk Factors for the Discontinuation of Home Medical Care among Low-functioning Older Patients. J Nutr Health Aging 2016; 20:453-7. [PMID: 26999247 DOI: 10.1007/s12603-015-0606-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
OBJECTIVES Older patients receiving home medical care often have declining functional status and multiple disease conditions. It is important to identify the risk factors for care transition events in this population in order to avoid preventable transitions. In the present study, therefore, we investigated the factors associated with discontinuation of home medical care as a potentially preventable care transition event in older patients. METHODS Baseline data for participants in the Observational study of Nagoya Elderly with HOme MEdical (ONEHOME) study and data on the mortality, institutionalization, or hospitalisation of the study participants during a 2-year follow-up period were used. Discontinuation of home care was defined as admission to a hospital for any reason, institutionalization, or death. Univariate and multivariate Cox hazard models were used to assess the association of each of the factors with the discontinuation of home care during the observational period. The covariates included in the multivariate analysis were those significantly associated with the discontinuation of home care at the level of P<0.05 in the univariate analysis. RESULTS The univariate Cox hazard model revealed that a low hemoglobin level (< 11g/dL), low serum albumin level (< 3g/dL), higher Charlson Comorbidity Index score, and low Mini Nutritional Assessment Short Form score (< 7) were significantly associated with the discontinuation of home care. A multivariate Cox hazard model including these four factors demonstrated that all four were independently associated with home-care discontinuation. CONCLUSIONS The present results demonstrated that anemia, hypoalbuminemia, malnourishment, and the presence of serious comorbidities were associated with the discontinuation of home medical care among low-functioning older patients.
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Affiliation(s)
- H Umegaki
- Hiroyuki Umegaki, Nagoya University Graduate School of Medicine, Department of Community Healthcare and Geriatrics, 65 Tsuruma-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan, Phone: +81-52-744-2364; Fax: +81-52-744-2371; Email address:
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12
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Yoshida T, Ideta S, Shimojima T, Malaeb W, Shinada K, Suzuki H, Nishi I, Fujimori A, Ishizaka K, Shin S, Nakashima Y, Anzai H, Arita M, Ino A, Namatame H, Taniguchi M, Kumigashira H, Ono K, Kasahara S, Shibauchi T, Terashima T, Matsuda Y, Nakajima M, Uchida S, Tomioka Y, Ito T, Kihou K, Lee CH, Iyo A, Eisaki H, Ikeda H, Arita R, Saito T, Onari S, Kontani H. Anisotropy of the superconducting gap in the iron-based superconductor BaFe2(As(1-x)P(x))2. Sci Rep 2014; 4:7292. [PMID: 25465027 PMCID: PMC4252890 DOI: 10.1038/srep07292] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [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: 04/24/2014] [Accepted: 11/14/2014] [Indexed: 11/22/2022] Open
Abstract
We report peculiar momentum-dependent anisotropy in the superconducting gap observed by angle-resolved photoemission spectroscopy in BaFe2(As1-xPx)2 (x = 0.30, Tc = 30 K). Strongly anisotropic gap has been found only in the electron Fermi surface while the gap on the entire hole Fermi surfaces are nearly isotropic. These results are inconsistent with horizontal nodes but are consistent with modified s± gap with nodal loops. We have shown that the complicated gap modulation can be theoretically reproduced by considering both spin and orbital fluctuations.
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Affiliation(s)
- T Yoshida
- 1] Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan [2] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan
| | - S Ideta
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - T Shimojima
- Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
| | - W Malaeb
- Institute of Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - K Shinada
- Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
| | - H Suzuki
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - I Nishi
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - A Fujimori
- 1] Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan [2] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan
| | - K Ishizaka
- Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
| | - S Shin
- Institute of Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Y Nakashima
- Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - H Anzai
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan
| | - M Arita
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan
| | - A Ino
- Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - H Namatame
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan
| | - M Taniguchi
- 1] Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan [2] Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan
| | - H Kumigashira
- KEK, Photon Factory, Tsukuba, Ibaraki 305-0801, Japan
| | - K Ono
- KEK, Photon Factory, Tsukuba, Ibaraki 305-0801, Japan
| | - S Kasahara
- 1] Research Center for Low Temperature and Materials Sciences, Kyoto University, Kyoto 606-8502, Japan [2] Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - T Shibauchi
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - T Terashima
- Research Center for Low Temperature and Materials Sciences, Kyoto University, Kyoto 606-8502, Japan
| | - Y Matsuda
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - M Nakajima
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - S Uchida
- 1] Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan [2] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan
| | - Y Tomioka
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
| | - T Ito
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
| | - K Kihou
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
| | - C H Lee
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
| | - A Iyo
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
| | - H Eisaki
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
| | - H Ikeda
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - R Arita
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
| | - T Saito
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] Department of Physics, Nagoya University, Furo-cho, Nagoya 464-8602, Japan
| | - S Onari
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] Department of Applied Physics, Nagoya University, Furo-cho, Nagoya 464-8602, Japan
| | - H Kontani
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] Department of Physics, Nagoya University, Furo-cho, Nagoya 464-8602, Japan
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13
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Sakano M, Bahramy MS, Katayama A, Shimojima T, Murakawa H, Kaneko Y, Malaeb W, Shin S, Ono K, Kumigashira H, Arita R, Nagaosa N, Hwang HY, Tokura Y, Ishizaka K. Strongly spin-orbit coupled two-dimensional electron gas emerging near the surface of polar semiconductors. Phys Rev Lett 2013; 110:107204. [PMID: 23521291 DOI: 10.1103/physrevlett.110.107204] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Indexed: 06/01/2023]
Abstract
We investigate the two-dimensional highly spin-polarized electron accumulation layers commonly appearing near the surface of n-type polar semiconductors BiTeX (X=I, Br, and Cl) by angular-resolved photoemission spectroscopy. Because of the polarity and the strong spin-orbit interaction built in the bulk atomic configurations, the quantized conduction-band subbands show giant Rashba-type spin splitting. The characteristic 2D confinement effect is clearly observed also in the valence bands down to the binding energy of 4 eV. The X-dependent Rashba spin-orbit coupling is directly estimated from the observed spin-split subbands, which roughly scales with the inverse of the band-gap size in BiTeX.
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Affiliation(s)
- M Sakano
- Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
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14
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Okazaki K, Ito Y, Ota Y, Kotani Y, Shimojima T, Kiss T, Watanabe S, Chen CT, Niitaka S, Hanaguri T, Takagi H, Chainani A, Shin S. Evidence for a cos(4φ) modulation of the superconducting energy gap of optimally doped FeTe(0.6)Se(0.4) single crystals using laser angle-resolved photoemission spectroscopy. Phys Rev Lett 2012; 109:237011. [PMID: 23368253 DOI: 10.1103/physrevlett.109.237011] [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: 07/27/2012] [Indexed: 06/01/2023]
Abstract
We study the superconducting-gap anisotropy of the Γ-centered hole Fermi surface in optimally doped FeTe(0.6)Se(0.4) (T(c)=14.5 K), using laser-excited angle-resolved photoemission spectroscopy. We observe sharp superconducting (SC) coherence peaks at T=2.5 K. In contrast to earlier angle-resolved photoemission spectroscopy studies but consistent with thermodynamic results, the momentum dependence shows a cos(4φ) modulation of the SC-gap anisotropy. The observed SC-gap anisotropy strongly indicates that the pairing interaction is not a conventional phonon-mediated isotropic one. Instead, the results suggest the importance of second-nearest-neighbor electronic interactions between the iron sites in the framework of s(±)-wave superconductivity.
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Affiliation(s)
- K Okazaki
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
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15
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Okazaki K, Ota Y, Kotani Y, Malaeb W, Ishida Y, Shimojima T, Kiss T, Watanabe S, Chen CT, Kihou K, Lee CH, Iyo A, Eisaki H, Saito T, Fukazawa H, Kohori Y, Hashimoto K, Shibauchi T, Matsuda Y, Ikeda H, Miyahara H, Arita R, Chainani A, Shin S. Octet-Line Node Structure of Superconducting Order Parameter in KFe2As2. Science 2012; 337:1314-7. [DOI: 10.1126/science.1222793] [Citation(s) in RCA: 198] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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16
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Kiss T, Chainani A, Yamamoto HM, Miyazaki T, Akimoto T, Shimojima T, Ishizaka K, Watanabe S, Chen CT, Fukaya A, Kato R, Shin S. Quasiparticles and Fermi liquid behaviour in an organic metal. Nat Commun 2012; 3:1089. [PMID: 23011143 PMCID: PMC3658098 DOI: 10.1038/ncomms2079] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [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: 04/05/2012] [Accepted: 08/22/2012] [Indexed: 11/30/2022] Open
Abstract
Many organic metals display exotic properties such as superconductivity, spin-charge separation and so on and have been described as quasi-one-dimensional Luttinger liquids. However, a genuine Fermi liquid behaviour with quasiparticles and Fermi surfaces have not been reported to date for any organic metal. Here, we report the experimental Fermi surface and band structure of an organic metal (BEDT-TTF)(3)Br(pBIB) obtained using angle-resolved photoelectron spectroscopy, and show its consistency with first-principles band structure calculations. Our results reveal a quasiparticle renormalization at low energy scales (effective mass m*=1.9 m(e)) and ω(2) dependence of the imaginary part of the self energy, limited by a kink at ~50 meV arising from coupling to molecular vibrations. The study unambiguously proves that (BEDT-TTF)(3)Br(pBIB) is a quasi-2D organic Fermi liquid with a Fermi surface consistent with Shubnikov-de Haas results.
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Affiliation(s)
- T Kiss
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
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17
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Ishizaka K, Bahramy MS, Murakawa H, Sakano M, Shimojima T, Sonobe T, Koizumi K, Shin S, Miyahara H, Kimura A, Miyamoto K, Okuda T, Namatame H, Taniguchi M, Arita R, Nagaosa N, Kobayashi K, Murakami Y, Kumai R, Kaneko Y, Onose Y, Tokura Y. Giant Rashba-type spin splitting in bulk BiTeI. Nat Mater 2011; 10:521-526. [PMID: 21685900 DOI: 10.1038/nmat3051] [Citation(s) in RCA: 225] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Accepted: 05/19/2011] [Indexed: 05/30/2023]
Abstract
There has been increasing interest in phenomena emerging from relativistic electrons in a solid, which have a potential impact on spintronics and magnetoelectrics. One example is the Rashba effect, which lifts the electron-spin degeneracy as a consequence of spin-orbit interaction under broken inversion symmetry. A high-energy-scale Rashba spin splitting is highly desirable for enhancing the coupling between electron spins and electricity relevant for spintronic functions. Here we describe the finding of a huge spin-orbit interaction effect in a polar semiconductor composed of heavy elements, BiTeI, where the bulk carriers are ruled by large Rashba-like spin splitting. The band splitting and its spin polarization obtained by spin- and angle-resolved photoemission spectroscopy are well in accord with relativistic first-principles calculations, confirming that the spin splitting is indeed derived from bulk atomic configurations. Together with the feasibility of carrier-doping control, the giant-Rashba semiconductor BiTeI possesses excellent potential for application to various spin-dependent electronic functions.
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Affiliation(s)
- K Ishizaka
- Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
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18
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Shimojima T, Sakaguchi F, Ishizaka K, Ishida Y, Kiss T, Okawa M, Togashi T, Chen CT, Watanabe S, Arita M, Shimada K, Namatame H, Taniguchi M, Ohgushi K, Kasahara S, Terashima T, Shibauchi T, Matsuda Y, Chainani A, Shin S. Orbital-Independent Superconducting Gaps in Iron Pnictides. Science 2011; 332:564-7. [DOI: 10.1126/science.1202150] [Citation(s) in RCA: 126] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- T. Shimojima
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan
- Japan Science and Technology Agency (JST), Core Research for Evolutional Science and Technology (CREST), Chiyoda-ku, Tokyo 102-0075, Japan
| | - F. Sakaguchi
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - K. Ishizaka
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan
- Japan Science and Technology Agency (JST), Core Research for Evolutional Science and Technology (CREST), Chiyoda-ku, Tokyo 102-0075, Japan
| | - Y. Ishida
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan
- JST, Transformative Research Project on Iron Pnictides, Chiyoda-ku, Tokyo 102-0075, Japan
| | - T. Kiss
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - M. Okawa
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - T. Togashi
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - C.-T. Chen
- Beijing Center for Crystal Research and Development, Chinese Academy of Science, Zhongguancun, Beijing 100190, China
| | - S. Watanabe
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - M. Arita
- Hiroshima Synchrotron Radiation Center and Graduate School of Science, Hiroshima University, Hiroshima 739-8526, Japan
| | - K. Shimada
- Hiroshima Synchrotron Radiation Center and Graduate School of Science, Hiroshima University, Hiroshima 739-8526, Japan
| | - H. Namatame
- Hiroshima Synchrotron Radiation Center and Graduate School of Science, Hiroshima University, Hiroshima 739-8526, Japan
| | - M. Taniguchi
- Hiroshima Synchrotron Radiation Center and Graduate School of Science, Hiroshima University, Hiroshima 739-8526, Japan
| | - K. Ohgushi
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan
- JST, Transformative Research Project on Iron Pnictides, Chiyoda-ku, Tokyo 102-0075, Japan
| | - S. Kasahara
- Research Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - T. Terashima
- Research Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - T. Shibauchi
- Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Y. Matsuda
- Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - A. Chainani
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - S. Shin
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan
- Japan Science and Technology Agency (JST), Core Research for Evolutional Science and Technology (CREST), Chiyoda-ku, Tokyo 102-0075, Japan
- JST, Transformative Research Project on Iron Pnictides, Chiyoda-ku, Tokyo 102-0075, Japan
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
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19
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Shimojima T, Ishizaka K, Ishida Y, Katayama N, Ohgushi K, Kiss T, Okawa M, Togashi T, Wang XY, Chen CT, Watanabe S, Kadota R, Oguchi T, Chainani A, Shin S. Orbital-dependent modifications of electronic structure across the magnetostructural transition in BaFe2As2. Phys Rev Lett 2010; 104:057002. [PMID: 20366786 DOI: 10.1103/physrevlett.104.057002] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2009] [Indexed: 05/29/2023]
Abstract
Laser angle-resolved photoemission spectroscopy (ARPES) is employed to investigate the temperature (T) dependence of the electronic structure in BaFe2As2 across the magnetostructural transition at T{N} approximately 140 K. A drastic transformation in Fermi surface (FS) shape across T{N} is observed, as expected by first-principles band calculations. Polarization-dependent ARPES and band calculations consistently indicate that the observed FSs at k{z} approximately pi in the low-T antiferromagnetic state are dominated by the Fe3d{zx} orbital, leading to the twofold electronic structure. These results indicate that magnetostructural transition in BaFe2As2 accompanies orbital-dependent modifications in the electronic structure.
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Affiliation(s)
- T Shimojima
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
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20
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Ishizaka K, Eguchi R, Tsuda S, Chainani A, Yokoya T, Kiss T, Shimojima T, Togashi T, Watanabe S, Chen CT, Takano Y, Nagao M, Sakaguchi I, Takenouchi T, Kawarada H, Shin S. Temperature-dependent localized excitations of doped carriers in superconducting diamond. Phys Rev Lett 2008; 100:166402. [PMID: 18518227 DOI: 10.1103/physrevlett.100.166402] [Citation(s) in RCA: 3] [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: 08/28/2007] [Indexed: 05/26/2023]
Abstract
Laser-excited photoemission spectroscopy is used to show that the doped carriers in metallic or superconducting diamond couple strongly to the lattice via high-energy (approximately 150 meV) optical phonons, with direct observations of localized Franck-Condon multiphonon sidebands appearing as Fermi-edge replicas. It exhibits a temperature-dependent spectral weight transfer from higher to lower energy sidebands and zero-phonon Fermi-edge states. The quantified coupling strength shows a systematic increase on lowering temperature, implicating its relation to the normal state transport and superconductivity.
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Affiliation(s)
- K Ishizaka
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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21
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Kiss T, Shimojima T, Ishizaka K, Chainani A, Togashi T, Kanai T, Wang XY, Chen CT, Watanabe S, Shin S. A versatile system for ultrahigh resolution, low temperature, and polarization dependent laser-angle-resolved photoemission spectroscopy. Rev Sci Instrum 2008; 79:023106. [PMID: 18315282 DOI: 10.1063/1.2839010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We have developed a low temperature ultrahigh resolution system for polarization dependent angle-resolved photoemission spectroscopy (ARPES) using a vacuum ultraviolet (vuv) laser (hnu=6.994 eV) as a photon source. With the aim of addressing low energy physics, we show the system performance with angle-integrated PES at the highest energy resolution of 360 mueV and the lowest temperature of 2.9 K. We describe the importance of a multiple-thermal-shield design for achieving the low temperature, which allows a clear measurement of the superconducting gap of tantalum metal with a T(c)=4.5 K. The unique specifications and quality of the laser source (narrow linewidth of 260 mueV, high photon flux), combined with a half-wave plate, facilitates ultrahigh energy and momentum resolution polarization dependent ARPES. We demonstrate the use of s- and p-polarized laser-ARPESs in studying the superconducting gap on bilayer-split bands of a high T(c) cuprate. The unique features of the quasi-continuous-wave vuv laser and low temperature enables ultrahigh-energy and -momentum resolution studies of the spectral function of a solid with large escape depth. We hope the present work helps in defining polarization dependent laser excited angle-resolved photoemission spectroscopy as a frontier tool for the study of electronic structure and properties of materials at the sub-meV energy scale.
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Affiliation(s)
- T Kiss
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
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22
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Baba T, Yokoya T, Tsuda S, Kiss T, Shimojima T, Ishizaka K, Takeya H, Hirata K, Watanabe T, Nohara M, Takagi H, Nakai N, Machida K, Togashi T, Watanabe S, Wang XY, Chen CT, Shin S. Bulk electronic structure of the antiferromagnetic superconducting phase in ErNi2B2C. Phys Rev Lett 2008; 100:017003. [PMID: 18232808 DOI: 10.1103/physrevlett.100.017003] [Citation(s) in RCA: 3] [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: 11/24/2006] [Indexed: 05/25/2023]
Abstract
We have performed temperature- (T-)dependent laser-photoemission spectroscopy of the antiferromagnetic (AF) superconductor ErNi2B2C to study the electronic-structure evolution reflecting the interplay between antiferromagnetism and superconductivity. The spectra at the superconducting (SC) phase show a very broad spectral shape. A T-dependent SC gap shows a sudden deviation from the BCS prediction just below TN. This observation can be explained well by the theoretical model and thus represents the characteristic bulk electronic structure of the AF SC phase for the first time.
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Affiliation(s)
- T Baba
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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23
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Shimojima T, Shibata Y, Ishizaka K, Kiss T, Chainani A, Yokoya T, Togashi T, Wang XY, Chen CT, Watanabe S, Yamaura J, Yonezawa S, Muraoka Y, Hiroi Z, Saitoh T, Shin S. Interplay of superconductivity and rattling phenomena in beta-pyrochlore KOs2O6 studied by photoemission spectroscopy. Phys Rev Lett 2007; 99:117003. [PMID: 17930463 DOI: 10.1103/physrevlett.99.117003] [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: 11/24/2006] [Indexed: 05/25/2023]
Abstract
The electronic structure near the Fermi level (EF) of the beta-pyrochlore superconductor KOs2O6 is studied using laser-excited ultrahigh-resolution photoemission spectroscopy. The superconducting gap clearly opens across the superconducting transition (Tc=9.6 K), with the strong electron-phonon coupling value of 2Delta(0)/k B Tc>or=4.56. A fitting analysis identifies clear anomalies at Tp=7.5 K in the temperature dependencies of the superconducting gap size and the quasiparticle relaxation lifetime. These anomalies and the fine spectral structures arising from phonons suggest that the existence of the rattling behavior of K ions significantly affects the superconductivity in KOs2O6.
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Affiliation(s)
- T Shimojima
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
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24
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Ishizaka K, Eguchi R, Tsuda S, Yokoya T, Chainani A, Kiss T, Shimojima T, Togashi T, Watanabe S, Chen CT, Zhang CQ, Takano Y, Nagao M, Sakaguchi I, Takenouchi T, Kawarada H, Shin S. Observation of a superconducting gap in boron-doped diamond by laser-excited photoemission spectroscopy. Phys Rev Lett 2007; 98:047003. [PMID: 17358800 DOI: 10.1103/physrevlett.98.047003] [Citation(s) in RCA: 2] [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: 04/04/2006] [Indexed: 05/14/2023]
Abstract
We investigate the temperature (T)-dependent low-energy electronic structure of a boron-doped diamond thin film using ultrahigh resolution laser-excited photoemission spectroscopy. We observe a clear shift of the leading edge below T=11 K, indicative of a superconducting gap opening (Delta approximately 0.78 meV at T=4.5 K). The gap feature is significantly broad and a well-defined quasiparticle peak is lacking even at the lowest temperature of measurement (=4.5 K). We discuss our results in terms of disorder effects on the normal state transport and superconductivity in this system.
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Affiliation(s)
- K Ishizaka
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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25
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Shimojima T, Ishizaka K, Tsuda S, Kiss T, Yokoya T, Chainani A, Shin S, Badica P, Yamada K, Togano K. Angle-resolved photoemission study of the cobalt oxide superconductor Na(x)CoO(2) x yH(2)O: observation of the Fermi surface. Phys Rev Lett 2006; 97:267003. [PMID: 17280457 DOI: 10.1103/physrevlett.97.267003] [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: 04/21/2006] [Indexed: 05/13/2023]
Abstract
The cobalt oxide superconductor Na(x)CoO(2) x yH(2)O is studied by angle-resolved photoemission spectroscopy. We report the Fermi surface (FS) topology and electronic structure near the Fermi level (E(F)) in the normal state of Na(x)CoO(2) x yH(2)O. Our result indicates the presence of the hexagonal FS centered at the Gamma point, while the small pocket FSs along Gamma-K direction are absent, similar to Na(x)CoO(2). The top of the e(g)(') band, which is expected in band calculations to form the small pocket FSs, extends to within approximately 30 meV below E(F), closer to E(F) than in Na(x)CoO(2). We discuss its possible role in superconductivity, comparing with other experimental and theoretical results.
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Affiliation(s)
- T Shimojima
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
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26
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Eguchi R, Kiss T, Tsuda S, Shimojima T, Mizokami T, Yokoya T, Chainani A, Shin S, Inoue IH, Togashi T, Watanabe S, Zhang CQ, Chen CT, Arita M, Shimada K, Namatame H, Taniguchi M. Bulk- and surface-sensitive high-resolution photoemission study of two mott-hubbard systems: SrVO3 and CaVO3. Phys Rev Lett 2006; 96:076402. [PMID: 16606115 DOI: 10.1103/physrevlett.96.076402] [Citation(s) in RCA: 2] [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: 02/04/2005] [Indexed: 05/08/2023]
Abstract
We study the electronic structure of Mott-Hubbard systems SrVO3 and CaVO3 with bulk and surface-sensitive high-resolution photoemission spectroscopy, using a vacuum ultraviolet laser, synchrotron radiation, and a discharge lamp (hv = 7-21 eV). A systematic suppression of the density of states (DOS) within approximately 0.2 eV of the Fermi level (EF) is found on decreasing photon energy, i.e., on increasing bulk sensitivity. The coherent band in SrVO3 and CaVO3 is shown to consist of surface and bulk-derived features, separated in energy. The stronger distortion on surface of CaVO3 compared to SrVO3 leads to a higher surface metallicity in the coherent DOS at EF, consistent with recent theory.
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Affiliation(s)
- R Eguchi
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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27
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Shimoyamada A, Tsuda S, Ishizaka K, Kiss T, Shimojima T, Togashi T, Watanabe S, Zhang CQ, Chen CT, Matsushita Y, Ueda H, Ueda Y, Shin S. Heavy-fermion-like state in a transition metal oxide LiV2O4 single crystal: indication of Kondo resonance in the photoemission spectrum. Phys Rev Lett 2006; 96:026403. [PMID: 16486605 DOI: 10.1103/physrevlett.96.026403] [Citation(s) in RCA: 4] [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: 10/10/2005] [Indexed: 05/06/2023]
Abstract
We have performed a vacuum ultraviolet laser excited photoemission spectroscopy on a d-electron heavy-fermion-like material LiV2O4 single crystal. We observed a sharp peak structure in the density of states at approximately 4 meV above the Fermi level (E(F)). The evolution of the peak height corresponds well with the crossover behavior to the heavy-fermion-like state as observed in the thermal and transport properties. The position, shape, and temperature (T) dependence of the peak structure is quite similar to the Kondo resonance observed in conventional f-electron heavy Fermion compounds.
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Affiliation(s)
- A Shimoyamada
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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28
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Kiss T, Kanetaka F, Yokoya T, Shimojima T, Kanai K, Shin S, Onuki Y, Togashi T, Zhang C, Chen CT, Watanabe S. Photoemission spectroscopic evidence of gap anisotropy in an f-electron superconductor. Phys Rev Lett 2005; 94:057001. [PMID: 15783678 DOI: 10.1103/physrevlett.94.057001] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2004] [Indexed: 05/24/2023]
Abstract
We used low-temperature ultrahigh-resolution (360 microeV) photoemission spectroscopy with a laser as a photon source (Laser-PES) to study the superconducting (SC) gap of an f-electron superconductor CeRu2. The unique combination of the large escape depth expected from the known universal behavior and extremely high-energy resolution has enabled us to directly measure the bulk SC gap of an f-electron superconductor for the first time. The present study provides direct evidence for an anisotropic SC gap in CeRu2, and also demonstrates the potential of Laser-PES in investigating unconventional superconductivity realized in correlated d- and f-electron superconductors.
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Affiliation(s)
- T Kiss
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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29
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Inoue S, Nakazawa T, Kantake M, Kaneko K, Shimojima T. [Early infantile patients of RS viral bronchiolitis with afebrile convulsions]. No To Hattatsu 2003; 35:347-9. [PMID: 12875214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
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30
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Hiroi M, Shimojima T, Kashimata M, Miyata T, Takano H, Takahama M, Sakagami H. Inhibition by Porphyromonas gingivalis LPS of apoptosis induction in human peripheral blood polymorphonuclear leukocytes. Anticancer Res 1998; 18:3475-9. [PMID: 9858927] [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: 02/09/2023]
Abstract
Many factors, such as cytokines and bacterial products, are known to affect the life-span of polymorphonuclear leukocytes (PMNs). We investigated here whether Porphyromonas gingivalis (P.gingivalis) LPS slows down the apoptotic process of PMNs. During incubation in regular culture medium, the viability of PMNs progressively declined, producing apoptotic cells, characterized by chromatin condensation, internucleosomal DNA fragmentation, cell shrinkage and blebbing of plasma membrane. P.gingivalis LPS significantly increased the viability of PMNs and reduced the production of fragmented DNA, as efficiently as E.coli LPS. The present study suggests that the retardation of PMNs apoptosis by P.gingivalis LPS may modulate the restoration of acute inflammation in the periodontal tissues, where activated PMNs accumulate.
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Affiliation(s)
- M Hiroi
- Department of Dental Pharmacology, Meikai University School of Dentistry, Saitama, Japan
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31
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Hiroi M, Tajima M, Shimojima T, Kashimata M, Miyata T, Sakagami H. Re-evaluation of the culture condition of polymorphonuclear cells for the study of apoptosis induction. Anticancer Res 1998; 18:1813-8. [PMID: 9673409] [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: 02/08/2023]
Abstract
The culture conditions of human peripheral blood polymorphonuclear leukocytes (PMN) in the study of apoptosis induction were re-evaluated. The changes in the relative viable cell number of PMNs after tumor necrosis factor (TNF) treatment were colorimetrically investigated using a cell counting kit. The relative potency of PMNs to produce the superoxide anion (O2-) was measured as the reduction of color intensity by addition of superoxide dismutase (SOD). When the PMNs were cultured in conventional RPMI1640 medium supplemented with 10% fetal bovine serum (FBS), the stimulation effect of TNF on O2- generation by PMNs was observed only for the first 6 hours. When FBS was replaced with human serum, the effect of TNF was maintained for longer incubation periods. Prolonged incubation of PMNs spontaneously produced large DNA fragments, and the extent of DNA fragmentation was relatively smaller in human serum-containing medium. TNF, LPS, hyperthermia or potassium thiocyanate slightly accelerated the production of large DNA fragments, as well as the induction of trace amounts of internucleosomal DNA cleavage in PMNs, which became detectable only after concentration by fractional isopropanol precipitation. The present study suggests the importance of the use of human serum rather than conventional FBS for the study of apoptosis induction in PMNs.
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Affiliation(s)
- M Hiroi
- Department of Dental Pharmacology, Meikai University School of Dentistry, Saitama, Japan
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32
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Imai T, Matsuda K, Shimojima T, Hashimoto T, Masuhiro Y, Kitamoto T, Sugita A, Suzuki K, Matsumoto H, Masushige S, Nogi Y, Muramatsu M, Handa H, Kato S. ERC-55, a binding protein for the papilloma virus E6 oncoprotein, specifically interacts with vitamin D receptor among nuclear receptors. Biochem Biophys Res Commun 1997; 233:765-9. [PMID: 9168930 DOI: 10.1006/bbrc.1997.6531] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
VDR regulates gene expression in a ligand-dependent way by binding to cognate enhancer elements of target gene promoters. The ligand-dependent activation function, AF-2, of VDR is thought to require transcriptional co-activators/co-repressors together with basal transcriptional machinery. Using a yeast two hybrid system with VDR, we have isolated a mouse Ca(2+)-binding protein (designated as VAF1) specifically interacting in vivo and in vitro with VDR among nuclear receptors like RAR, RXR, ER and GR. VAF1 is a mouse homologue to human ERC-55, which has recently been shown to interact with human papillomavirus oncogenic protein, E6[1]. Unlike those of many previously identified co-activators, the VDR-VAF1 interaction was ligand-independent. Thus, VAF1 seems a putative VDR-specific cofactor modulating its function.
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Affiliation(s)
- T Imai
- Faculty of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama, Japan
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33
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Yajima H, Kosukegawa A, Hoque MM, Shimojima T, Ishizu K, Takayama M, Sasaki Y, Sakai H, Otsuka M, Inokuchi S, Handa H. Construction and characterization of a recombinant adenovirus vector carrying the human preproinsulin gene under the control of the metallothionein gene promoter. Biochem Biophys Res Commun 1996; 229:778-87. [PMID: 8954972 DOI: 10.1006/bbrc.1996.1880] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
A new adenovirus vector carrying human-preproinsulin (h-PPI) genomic DNA, which was placed under the control of the mouse metallothionein gene promoter, was constructed. In the recombinant virus-infected cells, h-PPI gene expression increased as a function of ZnSO4 concentration. Reversed-phase high-performance liquid chromatography analysis revealed that the recombinant adenovirus-infected cells secreted immature insulin containing proinsulin and incorrectly processed insulin. Tyrosyl phosphorylation of human insulin receptor substrate 1 occurred when HepG2 cells were treated with the cultured medium, indicating that the h-PPI gene product was functionally active in vitro. We also examined the biological activity of the product using diabetic severe combined immunodeficient mice and confirmed that the h-PPI gene product reduced the blood glucose concentration in vivo. This study suggests that the adenovirus vector can be used to express a foreign gene under the control of an external promoter in various human cells.
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Affiliation(s)
- H Yajima
- Faculty of Bioscience and Biotechnology, Tokyo Institute of Technology, 4259, Nagatsuta-cho, Midori-ku, Yokohama, 226, Japan.
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34
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Takahashi Y, Nakayama K, Shimojima T, Itoh S, Kamataki T. Expression of aryl hydrocarbon receptor (AhR) and aryl hydrocarbon receptor nuclear translocator (Arnt) in adult rabbits known to be non-responsive to cytochrome P-450 1A1 (CYP1A1) inducers. Eur J Biochem 1996; 242:512-8. [PMID: 9022676 DOI: 10.1111/j.1432-1033.1996.0512r.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Induction of aryl hydrocarbon hydroxylase by aryl hydrocarbons occurs only in neonatal rabbits and not in adult rabbits [Kahl, G. F., Friederich, D. E., Bigelow, S. W., Okey, A. B. & Nebert, D. W. (1980) Dev. Pharmacol. Ther. 1,137-162]. In the present study, we isolated cDNA clones encoding aryl hydrocarbon receptor (AhR) and aryl hydrocarbon receptor nuclear translocator (Arnt) from adult rabbits. The deduced amino acid sequences of rabbit AhR and Arnt showed 80% and 94% identities with those of human AhR and Arnt, respectively. Rabbit AhR mRNA was predominantly expressed in the lung and liver. In contrast, rabbit Arnt mRNA was expressed at almost the same level in all tissues except for the heart, liver, and small intestine. Gel shift analysis showed that the AhR. Arnt complex could bind to the consensus xenobiotic-responsive element, which indicates that AhR expressed in adult rabbit liyers possessed binding activity to the consensus xenobiotic-responsive element in vitro, although aryl hydrocarbons did not induce the activity of AHH in adult rabbits. We propose that the incapability of adult rabbits to induce cytochrome P-450 1A1 (CYP1A1) is caused by factors other than AhR and Arnt.
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Affiliation(s)
- Y Takahashi
- Division of Drug Metabolism, Faculty of Pharmaceutical Sciences, Hokkaido University, Japan
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35
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Qu J, Hosoi K, Shimojima T, Oi T, Ikeda K. Effects of FMLP and LPS on [Ca2+]i of peritoneal exudate polymorphonuclear leukocytes following onset of inflammation. J Periodontal Res 1995; 30:153-8. [PMID: 7472996 DOI: 10.1111/j.1600-0765.1995.tb01267.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Because a general study of activated neutrophils may have relevance to periodontal diseases and accompanying inflammation, we studied a function of mouse polymorphonuclear leukocytes (PMNs) that exude into the peritoneal cavity in response to inflammation caused by i.p. injection of 2% casein. The effects of E. coli-lipopolysaccharide (E-LPS) and a chemotactic factor, N-formyl-N-methionyl-N-leucyl-L-phenylalanine (FMLP), on the level of intracellular calcium ([Ca2+]i) in these PMNs were examined. From analysis made with a laser cytometer (ACAS 570), the PMNs in exudates harvested 3-9 h after the onset of inflammation were shown to undergo [Ca2+]i elevation in response to 10(-6) M FMLP. The peak concentration of [Ca2+]i elicited by FMLP was highest in exudate cells 6 h after casein injection. In addition, about 65% of the PMNs in the 3-h exudate were FMLP sensitive displaying an elevated [Ca2+]i, whereas more than 85% of them in 6- and 9-h exudates became FMLP sensitive. Also, the maximum level of [Ca2+]i after FMLP stimulation was potentiated by pretreatment of the cells with E-LPS (0.2 microgram/ml). The present study suggests that PMNs induced by casein injection and appearing in mouse peritoneal exudate at different times possess significantly different ability to undergo [Ca2+]i elevation, and different susceptibility toward a chemotactic factor, FMLP.
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Affiliation(s)
- J Qu
- Department of Periodontology, Tokushima University School of Dentistry, Japan
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36
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Affiliation(s)
- Y Takahashi
- Division of Drug Metabolism, Faculty of Pharmaceutical Sciences, Hokkaido University, Japan
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37
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Abstract
Fibrotic gingival enlargements induced by phenytoin or nifedipine were examined with special reference to type VI collagen expression. Immunolocalization studies showed abnormal accumulation of type VI collagen around the collagen fiber bundles in the fibrotic gingival enlargements. Examination of total RNA extracted from fibroblasts and tissues of enlarged gingivae demonstrated increased type VI collagen steady-state mRNA levels. These results suggest that excessive deposition of type VI collagen in drug-induced gingival enlargement is attributed to increased expression of the collagen genes.
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Affiliation(s)
- H Shikata
- Department of Oral Pathology, School of Dentistry, Meikai University, Saitama, Japan
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38
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Ichimura K, Sato I, Qu J, Shimojima T, Fujihashi H, Ikeda K. [Relationship between development of periodontitis and macrophage's defensive power against infection in rats fed a high-sucrose diet]. Nihon Shishubyo Gakkai Kaishi 1990; 32:175-88. [PMID: 2133680 DOI: 10.2329/perio.32.175] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
As mononuclear phagocytes have been implicated as important cellular elements in the process of bone resorption, we decided to study the relevancy of macrophage (M phi) activities to bone resorption. In this study, we investigated the phagocytic activity and activities of lysosomal enzymes of peritoneal resident M phi from rats fed a high-sucrose diet (Diet 2000) to appreciate the effects of Diet 2000 on systemic and local factors. Minkin et al. have postulated that bone-derived chemotactic factors were released from foci undergoing resorption. And so, we examined the effects of the supernatant from alveolar bone cultures (Bone-sup) prepared from rats fed Diet 2000 on the activities of glycogen induced peritoneal M phi. As a result we observed mild alveolar bone resorption with slight inflammation when the rats were fed Diet 2000 for six months. In the periodontal tissue, we found inflammatory cell infiltration, destruction of the periodontal ligament, and lacunae in the alveolar bone due to resorption. The phagocytic activity of M phi treated with Bone-sups was suppressed before the periodontal tissue, which is inflammatory condition such as alveolar bone resorption. Furthermore the phagocytic activity of resident M phi taken from rats on the Diet 2000 was suppressed. After one month of the Diet 2000, the activity of acid phosphatase (AcP), a lysosomal enzyme of M phi, was suppressed, but by six months it was enhanced. The activity of beta-N-acetyl-D-glucosaminidase (NAG), another lysosomal enzyme of M phi, was suppressed over the total period of Diet 2000 before the periodontal tissue was destroyed. These findings suggest that the capacity for defense against infection by M phi is suppressed when periodontitis is initiated by Diet 2000 feeding and that M phi activities are influenced by some factors elaborated by cells in the alveolar bone.
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Affiliation(s)
- K Ichimura
- Department of Periodontology, Meikai University School of Dentistry
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39
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Ichimura K, Sato I, Shimojima T, Hobo K, Kanai A, Ikeda K. [Effects of periodontopathic bacterial components on phagocytic activity of rat peritoneal macrophages. Examination using ELISA]. Nihon Shishubyo Gakkai Kaishi 1989; 31:156-65. [PMID: 2637908 DOI: 10.2329/perio.31.156] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
This study examined the phagocytic activity of rat peritoneal resident macrophages to determine the movement of macrophages in local inflammation in periodontal disease. We studied phagocytic activity by enzymelinked immunosorbent assay (ELISA) and used the peroxidase-anti-peroxidase soluble complex (PAP; soluble immune complex) as a marker in. We also determined the basic conditions of this examination and studied the effects of bacterial components and the supernatants of sonicated periodontopathic bacterias. We obtained the number of applied macrophages, the concentration of PAP to use and the incubation time. The phagocytic activity of macrophages was enhanced significantly by the bacterial components lipopolysaccharide (LPS) and muramyldipeptide (MDP). Phagocytic activity was also enhanced by the addition of the supernatant of sonicated Bacteroides gingivalis at 40 micrograms/ml (concentration of protein) and significantly suppressed at 320 micrograms/ml. Moreover, activity was significantly enhanced by the supernatant of sonicated Capnocytophaga suputigena at 40 micrograms/ml and 160 micrograms/ml, and suppressed by the supernatant of Fusobacterium nucleatum at a low concentration of protein (5 micrograms/ml). These results suggested that LPS of gram-negative bacteria's endotoxicity and MDP on pivotal structure of peptidoglycans, which are bacterial cell surface components, exerted an effect on phagocytic activity. It was further indicated that the phagocytic activity of macrophages varied with the effects of each periodontopathic bacteria.
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40
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Sato I, Watanabe Y, Shimojima T, Onodera O, Ohsawa K, Nakajima K, Kurihashi Y, Mashima T, Kusunoki K, Ikeda K. [The study of dentifrice containing Phellodendron amurense extract on periodontal disease (II). The clinical effects of dentifrice containing Phellodendron amurense extract and anti-inflammatory agents]. Nihon Shishubyo Gakkai Kaishi 1988; 30:887-900. [PMID: 3253356 DOI: 10.2329/perio.30.887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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41
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Watanabe Y, Sato I, Shimojima T, Ikeda K, Fukuchi N, Suganuma N, Hirayama Y, Hayashi T, Kameyama S. [The study of dentifrice containing Phellodendron amurense extracts on periodontal disease (I). The anti-inflammatory effects and clinical effects of Phellodendron amurense extract on periodontal disease]. Nihon Shishubyo Gakkai Kaishi 1988; 30:875-86. [PMID: 3253355 DOI: 10.2329/perio.30.875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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42
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Nakashima K, Maeda S, Shimoyama M, Karami K, Shimojima T, Watanabe Y, Ikeda K. [Epidemiological research of periodontal disease from questionnaire and pocket examination for junior and senior high school students in Kawagoe]. Nihon Shishubyo Gakkai Kaishi 1988; 30:935-46. [PMID: 3253358 DOI: 10.2329/perio.30.935] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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43
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Shimojima T. [Effects of prostaglandins on superoxide anion production by human neutrophils induced by Bacteroides gingivalis. II]. Nihon Shishubyo Gakkai Kaishi 1988; 30:481-95. [PMID: 2855430 DOI: 10.2329/perio.30.481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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44
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Shimojima T, Mashima T, Hobo K, Kusunoki K, Marumoto Y, Ikeda K. [Effects of prostaglandins on superoxide production by human polymorphonuclear leukocytes]. Nihon Shishubyo Gakkai Kaishi 1987; 29:454-62. [PMID: 2851629 DOI: 10.2329/perio.29.454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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45
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Ikeda K, Watanabe Y, Nakashima K, Shimojima T, Mashima T, Miyake T, Iwagami K, Nishimoto M, Utsumi N. [Preventive and epidemic research in periodontal disease. 2. Study of preventive and epidemic research in periodontal disease in junior high school students in Kawagoe]. Nihon Shishubyo Gakkai Kaishi 1986; 28:662-9. [PMID: 3466975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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46
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Shimojima T, Iwakawa Y, Nakamura Y, Nishimoto M, Kusunoki K, Marumoto Y, Ikeda K. [Neutrophil function in patients with periodontal disease. 2. Effect of serum on O2 production by neutrophils]. Nihon Shishubyo Gakkai Kaishi 1986; 28:606-11. [PMID: 3466971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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47
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Shimojima T, Iwakawa Y, Nakamura Y, Marumoto Y, Kusunoki K, Ikeda K. [Neutrophil function in patients with periodontal diseases. 1. Role of serum in the NBT reduction test]. Nihon Shishubyo Gakkai Kaishi 1985; 27:153-9. [PMID: 3861731 DOI: 10.2329/perio.27.153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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48
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Kusunoki K, Hiyoshi K, Fujihashi H, Shimojima T, Ikeda K. [Orthodontic problems, in patients with periodontal disease. 1. Statistical studies of orthodontic problems in periodontal patients]. Nihon Shishubyo Gakkai Kaishi 1983; 25:234-41. [PMID: 6577093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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49
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Ikeda K, Hikima T, Kusunoki K, Watanabe Y, Ohara M, Fujihashi H, Shimojima T, Kurihashi Y, Maekawa K, Shimojima T, Kurihashi Y. [Clinical effect of dentifrice containing dl-alpha-Tocopheryl nicotinate]. Nihon Shishubyo Gakkai Kaishi 1982; 24:619-32. [PMID: 6963312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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50
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Hamano H, Shimojima T. [A TV equipped slit lamp microscope]. Nihon Ganka Kiyo 1969; 20:71-3. [PMID: 5391150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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