Magnetic field orientation dependent ground states in (TMTSF)2PF6

被引:4
作者
Chashechkina, EI [1 ]
Chaikin, PM [1 ]
机构
[1] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA
关键词
organic superconductors; metal-insulator transitions; transport measurements;
D O I
10.1016/S0379-6779(98)00352-X
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We report anisotropic and angular dependent magneto-resistance measurements in the ''normal" state of TMTSF2PF6 under pressure at low temperature. The most striking feature of this study occurs below 5K where we observe metallic behavior (dR/dT>0) when the field is aligned along intermolecular tunneling directions (Lebed magic angles) and non-metallic behavior (dR/dT>0) for other orientations. Previous results showed this behavior along the most conducting a direction, but here we show that the b and c (interplane) directions also exhibit this metallic to non-metallic transition with angle. At higher temperatures (similar to 15-20K) there is a resistance minimum in the conducting (a-b) plane which is absent in the interplane (c) direction. Since we expect phase transitions, or other changes in the electronic state, to be observable in all directions, this observation implies that the nature of the ground state is reflected in the 5K magic angle effects and is determined by interplane decoupling rather than in-plane dimensionality crossovers.
引用
收藏
页码:2176 / 2179
页数:4
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