TY - JOUR
T1 - Large entropy change derived from orbitally assisted three-centered two-electron σ bond formation in metallic Li0.33VS2
AU - Katayama, N.
AU - Tamura, S.
AU - Yamaguchi, T.
AU - Sugimoto, K.
AU - Iida, K.
AU - Matsukawa, T.
AU - Hoshikawa, A.
AU - Ishigaki, T.
AU - Kobayashi, S.
AU - Ohta, Y.
AU - Sawa, H.
N1 - Funding Information:
The authors are grateful to Y. Okamoto and N. Mitsuishi for valuable discussions. This work was partly supported by a Grant in Aid for Scientific Research (No. JP17K05530 and No. JP17K17793), Fuji Science and Technology Foundation, The Thermal and Electric Energy Technology Inc. Foundation, and Daiko Foundation. This work was carried out under the Visiting Researcher's Program of the Institute for Solid State Physics, the University of Tokyo. The synchrotron powder x-ray diffraction experiments were conducted at the BL5S2 of Aichi Synchrotron Radiation Center, Aichi Science and Technology Foundation, Aichi, Japan (Proposals No. 201702049, No. 201702101, No. 201703027, No. 201704027, and No. 201704099). The neutron experiment at the Materials and Life Science Experimental Facility of the J-PARC was performed under a user program (Proposal No. 2017B0041). Sample preparation for the neutron diffraction measurements was done at the CROSS user laboratories.
PY - 2018/8/7
Y1 - 2018/8/7
N2 - We discuss herein the emergence of a large entropy change in metallic Li0.33VS2 derived from orbitally assisted loose σ bond formation. Comprehensive structural studies based on synchrotron x-ray and neutron diffraction analyses clarify the fabrication of ribbon chains at 375 K, consisting of multiple three-centered two-electron σ bonds based on the viewpoint of local chemical bonding. Although the metallic conductivity persists down to the lowest temperature measured, an exceptionally large entropy change as a metal, as much as ΔS=6.6Jmol-1K-1, appears at the transition. The emergence of a large entropy change in a metallic state may possibly lead to different functional materials, such as a heat-storage material with a rapid thermal response.
AB - We discuss herein the emergence of a large entropy change in metallic Li0.33VS2 derived from orbitally assisted loose σ bond formation. Comprehensive structural studies based on synchrotron x-ray and neutron diffraction analyses clarify the fabrication of ribbon chains at 375 K, consisting of multiple three-centered two-electron σ bonds based on the viewpoint of local chemical bonding. Although the metallic conductivity persists down to the lowest temperature measured, an exceptionally large entropy change as a metal, as much as ΔS=6.6Jmol-1K-1, appears at the transition. The emergence of a large entropy change in a metallic state may possibly lead to different functional materials, such as a heat-storage material with a rapid thermal response.
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U2 - 10.1103/PhysRevB.98.081104
DO - 10.1103/PhysRevB.98.081104
M3 - Article
AN - SCOPUS:85051497248
VL - 98
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 2469-9950
IS - 8
M1 - 081104
ER -