77Se NMR evidence for the development of antiferromagnetic spin fluctuations of π-electrons in λ-(BETS)2GaCl4

Shigeru Takagi, Daisuke Maruta, Hiko Ichiro Sasaki, Hiroshi Uozaki, Hideaki Tsuchiya, Yasunori Abe, Yusuke Ishizaki, Eiichi Negishi, Hiroshi Matsui, Satoshi Endo, Naoki Toyota

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11 Citations (Scopus)

Abstract

The microscopic magnetic properties of superconducting (Tc ≅ 6 K) λ-(BETS)2GaCl4 (BETS = bis(ethylenedithio)tetraselenafulvalene) have been investigated by 77Se NMR in the normal state between 7.1 and 100 K on randomly oriented single crystals with κ-(BETS)2GaCl4 as a reference compound. From the T-dependences of the Knight shift and the linewidth, the intrinsic uniform susceptibility χq=0(T) has been found to decrease with decreasing T below 30 K for λ-(BETS) 2GaCl4. Nevertheless, 1/(T1T) does not show any corresponding decrease but is constant down to the lowest T, which indicates increasing contributions with decreasing T from antiferromagnetic spin fluctuations. The Knight shift and 1/(T1T) have been analyzed quantitatively and the enhancement factor K(α) > 1 is deduced in the low-T limit. On the basis of these results, the development of antiferromagnetic spin fluctuations of π-electrons at low T is concluded for λ-(BETS)2GaCl4.

Original languageEnglish
Pages (from-to)483-486
Number of pages4
JournalJournal of the Physical Society of Japan
Volume72
Issue number3
DOIs
Publication statusPublished - 2003 Mar 1

Keywords

  • κ-(BETS)GaCl
  • λ-(BETS)GaCl
  • Se NMR
  • Antiferromagnetic spin fluctuation
  • BETS compound
  • Organic conductor

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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