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Electron momentum density in liquid silicon (2013)

K. Matsuda, T. Nagao, Y. Kajihara, M. Inui, K. Tamura, J. Nakamura, K. Kimura, M. Yao, M. Itou, Y. Sakurai, and N. Hiraoka

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-17

Beschreibung: Author(s): K. Matsuda, T. Nagao, Y. Kajihara, M. Inui, K. Tamura, J. Nakamura, K. Kimura, M. Yao, M. Itou, Y. Sakurai, and N. Hiraoka The electron momentum density (EMD) in liquid silicon (Si) has been measured by synchrotron-based Compton scattering. The observed variation in the valence EMD upon melting, reflecting a semiconductor-metal transition of Si, is well explained by the collapse of the Jones zone of crystalline Si. Howe... [Phys. Rev. B 88, 115125] Published Mon Sep 16, 2013

Schlagwort(e): Electronic structure and strongly correlated systems

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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High-quality graphene on SiC(0001[over ¯]) formed through an epitaxial TiC layer (2013)

Keisuke Kimura, Kentaro Shoji, Yuta Yamamoto, Wataru Norimatsu, and Michiko Kusunoki

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-21

Beschreibung: Author(s): Keisuke Kimura, Kentaro Shoji, Yuta Yamamoto, Wataru Norimatsu, and Michiko Kusunoki The formation of large-area homogeneous graphene on a C-terminated SiC (0001̅ ) surface was achieved via decomposition of the SiC (0001̅ ) surface covered with an ultrathin but much more stable TiC layer than the reactive SiC(0001̅ ). By heating the SiC (0001̅ ) surface w... [Phys. Rev. B 87, 075431] Published Wed Feb 20, 2013

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

Print ISSN: 1098-0121

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Thema: Physik

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Pressure effects on the magnetoelectric properties of a multiferroic triangular-lattice antiferromagnet CuCrO_{2} (2013)

Takuya Aoyama, Atsushi Miyake, Tomoko Kagayama, Katsuya Shimizu, and Tsuyoshi Kimura

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-03-05

Beschreibung: Author(s): Takuya Aoyama, Atsushi Miyake, Tomoko Kagayama, Katsuya Shimizu, and Tsuyoshi Kimura Effects of high pressure exceeding 10 GPa on spin-driven ferroelectricity were investigated for a multiferroic, triangular-lattice antiferromagnet (TLA), CuCrO 2 . For this purpose, we developed a system which enables us to measure ferroelectric polarization under a pressure of 10 GPa by using a diamo... [Phys. Rev. B 87, 094401] Published Mon Mar 04, 2013

Schlagwort(e): Magnetism

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Thema: Physik

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Role of magnetic chirality in polarization flip upon a commensurate-incommensurate magnetic phase transition in YMn_{2}O_{5} (2013)

Shuichi Wakimoto, Hiroyuki Kimura, Yuma Sakamoto, Mamoru Fukunaga, Yukio Noda, Masayasu Takeda, and Kazuhisa Kakurai

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-11

Beschreibung: Author(s): Shuichi Wakimoto, Hiroyuki Kimura, Yuma Sakamoto, Mamoru Fukunaga, Yukio Noda, Masayasu Takeda, and Kazuhisa Kakurai We have performed simultaneous measurements of magnetic chirality by using polarized neutrons and electric polarization along the b axis of single crystals of YMn 4+ (Mn 1− x Ga x ) 3+ O 5 with x =0.047 and 0.12, in which nonmagnetic Ga ions dilute Mn 3+ spins. The x =0.047 sample exhibits high-temperature incom... [Phys. Rev. B 88, 140403] Published Thu Oct 10, 2013

Schlagwort(e): Magnetism

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Thema: Physik

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First-order ferroelastic transition in a magnetoelectric multiferroic: CuCrO_{2} (2013)

O. Aktas, G. Quirion, T. Otani, and T. Kimura

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-12-12

Beschreibung: Author(s): O. Aktas, G. Quirion, T. Otani, and T. Kimura We present the magnetic phase diagram of the multiferroic geometrically frustrated antiferromagnet CuCrO 2 determined using dielectric constant and ultrasonic velocity measurements with the magnetic field parallel to the [11̅ 0] direction. According to these measurements, at zero field the mag... [Phys. Rev. B 88, 224104] Published Wed Dec 11, 2013

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Thema: Physik

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Strongly hybridized electronic structure of YbAl_{2}: An angle-resolved photoemission study (2013)

M. Matsunami, T. Hajiri, H. Miyazaki, M. Kosaka, and S. Kimura

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-05-01

Beschreibung: Author(s): M. Matsunami, T. Hajiri, H. Miyazaki, M. Kosaka, and S. Kimura We report the electronic structure of a prototypical valence fluctuation system, YbAl 2 , using angle-resolved photoemission spectroscopy. The observed band dispersions and Fermi surfaces are well described in terms of band structure calculations based on local density approximation. Strong hybridizat... [Phys. Rev. B 87, 165141] Published Tue Apr 30, 2013

Schlagwort(e): Electronic structure and strongly correlated systems

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Thema: Physik

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Control of magnetic interaction and ferroelectricity by nonmagnetic Ga substitution in multiferroic YMn_{2}O_{5} (2013)

H. Kimura, Y. Sakamoto, M. Fukunaga, H. Hiraka, and Y. Noda

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-03-30

Beschreibung: Author(s): H. Kimura, Y. Sakamoto, M. Fukunaga, H. Hiraka, and Y. Noda We have studied the effects of substituting nonmagnetic Ga 3+ for Mn 3+ on dielectric and magnetic properties in multiferroic YMn 2 O 5 . Upon Ga substitution, whereby only the Mn 3+ ions are selectively replaced, the commensurate magnetic phase eventually disappeared owing to the disconnection of the magn... [Phys. Rev. B 87, 104414] Published Fri Mar 29, 2013

Schlagwort(e): Magnetism

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Tuning of magnetic and transport properties in Bi_{2}Te_{3} by divalent Fe doping (2013)

N. H. Jo, K. J. Lee, C. M. Kim, K. Okamoto, A. Kimura, K. Miyamoto, T. Okuda, Y. K. Kim, Z. Lee, T. Onimaru, T. Takabatake, and M. H. Jung

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-05-16

Beschreibung: Author(s): N. H. Jo, K. J. Lee, C. M. Kim, K. Okamoto, A. Kimura, K. Miyamoto, T. Okuda, Y. K. Kim, Z. Lee, T. Onimaru, T. Takabatake, and M. H. Jung We report the doping effect of a magnetic Fe ion in Bi 2 Te 3 , that is, Bi 2− x Fe x Te 3 ( x = 0, 0.08, 0.15, 0.2, 0.25, and 0.3). The paramagnetic magnetization data reveal that the Fe ions are doped in the divalent form. The Fe 2+ state substituted for Bi 3+ can create hole donors, which compensate for the e... [Phys. Rev. B 87, 201105] Published Wed May 15, 2013

Schlagwort(e): Electronic structure and strongly correlated systems

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Magnetoelectric hysteresis loops in Cr_{2}O_{3} at room temperature (2013)

Ayato Iyama and Tsuyoshi Kimura

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-05-29

Beschreibung: Author(s): Ayato Iyama and Tsuyoshi Kimura We revisit the room-temperature linear magnetoelectric effect in Cr 2 O 3 single crystals. It was found that the temperature dependence of dielectric constants in a magnetic field H shows a λ-shaped peak at the Néel temperature (≈307 K) and that electric polarization induced by applying H is reversed w... [Phys. Rev. B 87, 180408] Published Tue May 28, 2013

Schlagwort(e): Magnetism

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Spatially resolved magnetization in the Bose-Einstein condensed state of BaCuSi_{2}O_{6}: Evidence for imperfect frustration (2013)

S. Krämer, N. Laflorencie, R. Stern, M. Horvatić, C. Berthier, H. Nakamura, T. Kimura, and F. Mila

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-05-24

Beschreibung: Author(s): S. Krämer, N. Laflorencie, R. Stern, M. Horvatić, C. Berthier, H. Nakamura, T. Kimura, and F. Mila In order to understand the nature of the two-dimensional Bose-Einstein condensed (BEC) phase in BaCuSi 2 O 6 , we performed detailed 63 Cu and 29 Si NMR above the critical magnetic field, H c 1 =23.4 T. The two different alternating layers present in the system have very different local magnetizations close ... [Phys. Rev. B 87, 180405] Published Thu May 23, 2013

Schlagwort(e): Magnetism

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