SMB6 - KONDO INSULATOR OR EXOTIC METAL

被引:184
作者
COOLEY, C
ARONSON, MC
FISK, Z
CANFIELD, PC
机构
[1] FLORIDA STATE UNIV,NATL HIGH MAGNET FIELD LAB,TALLAHASSEE,FL 32306
[2] IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011
关键词
D O I
10.1103/PhysRevLett.74.1629
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
High pressure resistivity and Hall effect measurements on SmB6 show that the activation gap Δ vanishes discontinuously between 45 and 53 kbar, yielding at high pressures a mass-enhanced Fermi liquid phase. The low temperature transport is dominated by extended states in the gap with unusual superunitarity scattering properties, and a carrier density which grows almost exponentially with reduced Δ, saturating below 45 kbar near 0.15 electron per unit cell. Our results are inconsistent with hybridization gap models and suggest a striking parallel to Mott-Hubbard insulators. © 1995 The American Physical Society.
引用
收藏
页码:1629 / 1632
页数:4
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