Evidence of antiferromagnetic fluctuation in the unconventional superconductor λ-(BETS)2GaCl4 by 13C NMR

被引：22
|
作者：
Kobayashi, T. [1 ]
Kawamoto, A. [1 ]
机构：
[1] Hokkaido Univ, Grad Sch Sci, Dept Condensed Matter Phys, Sapporo, Hokkaido 0600810, Japan
来源：
PHYSICAL REVIEW B | 2017年 / 96卷 / 12期
基金：
日本学术振兴会;
关键词：
ORGANIC CONDUCTORS; BEDT-TTF; SPIN FLUCTUATIONS; PI-ELECTRONS; MOLECULES;
D O I：
10.1103/PhysRevB.96.125115
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We performed C-13 NMR measurements on the unconventional organic superconductor lambda-(BETS)(2)GaCl4 to clarify its electronic properties in the paramagnetic state. We found that the spin-lattice relaxation rate divided by temperature 1/T1T shows Curie-like enhancement above 55 K that arises from an antiferromagnetic fluctuation. In addition, we found additional enhancement of 1/T1T below 10 K, where the Knight shift decreases and the linewidth of NMR spectra is broadened. The result could be understood by the magnetic fluctuation induced by the nesting of the Fermi surface. We discovered that lambda-(BETS)(2)GaCl4 salt inherently exhibits the two different types of magnetic fluctuations.
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页数：5
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