1H-NMR studies of the low temperature phase of α-(BEDT-TTF)2KHg(SCN)4

T. Takahashi, R. Tsuchiya, K. Kanoda, M. Watabe, T. Sasaki, Naoki Toyota

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12 Citations (Scopus)

Abstract

We present the results of 1H-NMR relaxation and lineshape measurements in the organic conductor, α-(BEDT-TTF)2KHg(SCN)4, aiming at clarifying the origin of electric and magnetic anomalies observed below 10 K. The relaxation rate in the metallic region follows a Korringa relation, (T1T)-1 = 1.0 × 10-4 s-1K-1. Above 200 K, the thermal motions of ethylene groups dominate the 1H-T1-1; the activation energy was estimated to be 4100 K, which is the highest in the BEDT-TTF salts ever studied. (T1T)-1 was found to show a prominent enhancement below 8 K, but there was not a peak anomaly such as observed at the standard SDW transition. The second moment of the resonance line was constant in temperature down to 1.9 K. No evidence for static SDW order was obtained. The upper bound for the possible SDW amplitude was estimated to be 1% μB per molecule.

Original languageEnglish
Pages (from-to)2513-2518
Number of pages6
JournalSynthetic Metals
Volume56
Issue number1
DOIs
Publication statusPublished - 1993 Mar 29

Keywords

  • (BEDT-TTF)KHg(SCN)
  • H-NMR relaxation rate
  • SDW amplitude
  • thermal motions of ethylene groups

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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