TY - JOUR
T1 - Phase Diagram and Pressure Effects on Transport Properties of BaCo1-cursive Greek chiNicursive Greek chiS2
AU - Yasui, Yukio
AU - Sasaki, Hisashi
AU - Shamoto, Shin Ichi
AU - Sato, Masatoshi
N1 - Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 1997/10
Y1 - 1997/10
N2 - Transport measurements under the hydrostatic pressure p up to 18.8 kbar have been carried out on single crystals of BaCo1-cursive Greek chiNicursive Greek chiS2, which has a layered structure and exhibits the Mott metal-insulator (M-I) transition both with varying cursive Greek chi and with applying pressure. Based on resistivity data for cursive Greek chi = 0.00, 0.05. 0.14 and 0.18, a T-p-cursive Greek chi phase diagram of BaCO1-cursive Greek chiNicursive Greek chiS2 has been constructed. The phase diagram is similar to that of (V1-cursive Greek chiMcursive Greek chi)2O3 (M=Ti and Cr), although the present system does not exhibit clear discontinuity of the transition. Detailed transport behavior observed near the M-I transition induced by the external pressure are presented. For cursive Greek chi = 0.00, where a large Mott energy gap exists at ambient pressure, the intrinsic critical behavior of the Mott M-I transition seems to be observed, while for the samples with cursive Greek chi ≠ 0, randomness effects caused by the Ni-substitution for Co seems to be reflected in the critical behavior.
AB - Transport measurements under the hydrostatic pressure p up to 18.8 kbar have been carried out on single crystals of BaCo1-cursive Greek chiNicursive Greek chiS2, which has a layered structure and exhibits the Mott metal-insulator (M-I) transition both with varying cursive Greek chi and with applying pressure. Based on resistivity data for cursive Greek chi = 0.00, 0.05. 0.14 and 0.18, a T-p-cursive Greek chi phase diagram of BaCO1-cursive Greek chiNicursive Greek chiS2 has been constructed. The phase diagram is similar to that of (V1-cursive Greek chiMcursive Greek chi)2O3 (M=Ti and Cr), although the present system does not exhibit clear discontinuity of the transition. Detailed transport behavior observed near the M-I transition induced by the external pressure are presented. For cursive Greek chi = 0.00, where a large Mott energy gap exists at ambient pressure, the intrinsic critical behavior of the Mott M-I transition seems to be observed, while for the samples with cursive Greek chi ≠ 0, randomness effects caused by the Ni-substitution for Co seems to be reflected in the critical behavior.
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U2 - 10.1143/JPSJ.66.3194
DO - 10.1143/JPSJ.66.3194
M3 - Article
AN - SCOPUS:0642333871
VL - 66
SP - 3194
EP - 3201
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 10
ER -