Heavy fermions in LiV2O4:: Kondo compensation versus geometric frustration

被引：26

作者：

Kaps, H ^{[1
]}

Brando, M ^{[1
]}

Trinkl, W ^{[1
]}

Büttgen, N ^{[1
]}

Loidl, A ^{[1
]}

Scheidt, EW ^{[1
]}

Klemm, M ^{[1
]}

Horn, S ^{[1
]}

机构：

[1] Univ Augsburg, Inst Phys, D-86135 Augsburg, Germany

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2001年 / 13卷 / 37期

关键词：

D O I：

10.1088/0953-8984/13/37/307

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Li-7 nuclear magnetic resonance and heat capacity measurements were performed on the metallic spinel LiV2O4 down to 30 mK. The temperature dependencies of the linewidth, the Knight shift and the spin-lattice relaxation rate were investigated in the temperature range 30 mK less than or equal to T less than or equal to 280 K and at applied magnetic fields of 4.6, 10, 44 and 83 kOe. The longitudinal nuclear magnetization was found to relax following a stretched-exponential form with a stretching exponent in the range 0.5 < beta < 1. For temperatures T < 1 K and at the lowest applied magnetic field of 4.6 kOe, we observe a spin-lattice relaxation rate which slows down exponentially, exhibiting a hindering barrier of the order of 1 K. This excitation energy separates different configurations of a highly degenerate ground state of a completely frustrated magnet.

引用

页码：8497 / 8508

页数：12

共 48 条

[1] Electronic structure of the heavy fermion metal LiV2O4 [J].