Effect of Nominal Composition on Transport, Optical, Magnetic, and Thermodynamic Properties of SmS Single Crystals(Condensed matter: structure and mechanical and thermal properties)
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概要
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We have grown single crystals of SmS and investigated effects of nominal composition on the electrical resistivity, optical reflectivity, magnetoresistance, dc magnetization, and specific heat. We report that nominally stoichiometric and S-excess samples have an energy gap (E_g) of about 950 (±100)K while Sm-excess samples possess E_g of about 1500 (±100)K, and further that these values of E_g correlate with the lattice constant. These findings were interpreted as the chemical pressure effect. As an external magnetic field is increased, E_g monotonically decreases albeit in the nonmagnetic black phase, which can be an origin of reported negative magnetoresistance. The low-temperature specific heat under pressure shows the presence of an intrinsic γ-term in the golden phase in addition to a spurious γ-coefficient arising from secondary phases such as Sm_3S_4.
- 社団法人日本物理学会の論文
- 2007-06-15
著者
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SUZUKI Hiroyuki
National Institute for Materials Science
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MIZUNO Takafumi
School of Physical Sciences, The Graduate University for Advanced Studies (SOKENDAI)
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MATSUBAYASHI Kazuyuki
Department of Physics, Nagoya University
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IMURA Keiichiro
Department of Physics, Nagoya University
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SATO Noriaki
Department of Physics, Nagoya University
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Mizuno Takafumi
School Of Physical Sciences The Graduate University For Advanced Studies (sokendai)
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Matsubayashi Kazuyuki
The Institute For Solid State Physics Tokyo University
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Matsubayashi Kazuyuki
Institute For Solid State Physics The University Of Tokyo
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Matsubayashi Kazuyuki
Department Of Physics Graduate School Of Science Nagoya University
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Kimura Shin-ichi
Uvsor Facility Institute For Molecular Science:school Of Physical Sciences The Graduate University F
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NISHIOKA Takashi
Department of Material Science, Faculty of Science, Kochi University
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KIMURA Shin-ichi
School of Physical Sciences, The Graduate University for Advanced Studies (SOKENDAI)
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KODAMA Kazuto
Center for Advanced Marine Core Research, Kochi University
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Nishioka Takashi
Department Of Material Science Kochi University
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Sato Noriaki
Department Of Physics Graduate School Of Science Nagoya University
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Imura Keiichiro
Department Of Physics Graduate School Of Science Nagoya University
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Nishioka Takashi
Department Of Applied Physics Graduate School Of Engineering Osaka City University
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Sato N
Department Of Physics Graduate School Of Science Nagoya University
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Kodama Kazuto
Center For Advanced Marine Core Research Kochi University
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Suzuki Hiroyuki
National Institute For Material Science
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Kimura Shin-ichi
Uvsor Facility Institute For Molecular Science:school Of Physical Sciences The Graduate University F
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Sato Noriaki
Department Of Physics Nagoya University
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Sato Noriaki
Department Of Electronics Faculty Of Engineering Nagoya University
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Kosaka Masashi
Saitama Univ. Saitama
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Sato Noriaki
Nagoya Univ. Nagoya
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Suzuki Hiroyuki
Univ. Tokyo Chiba
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Sato Noriaki
Department of Electrical and Electronic Engineering, Tokyo Institute of Technology
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