Thermodynamic study of an incommensurate organic superconductor (MDT-TSF)(AuI2)0.436

Tetsushi Ishikawa, Yasuhiro Nakazawa, Satoshi Yamashita, Masaharu Oguni, Kazuya Saito, Kazuo Takimiya, Tetsuo Otsubo

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8 Citations (Scopus)

Abstract

Low-temperature heat capacity measurements are performed on the organic superconductor (MDT-TSF)(AuI2)0.436; its critical temperature determined by the transport measurement is 4.5 K. A broad but reproducible thermal anomaly related to the superconducting transition is observed during precise measurements of the heat capacity under magnetic fields of up to 6 T. An important finding is that almost 60% of the normal electron density of states remains even in the superconducting ground state. This phenomenon and the intrinsic broadening of the thermal anomaly are common to another organic superconductor κ-(BEDT-TTF)4Hg 2.89Br8, in which an incommensurate relationship exists between anion and donor lattices. However, it is emphasized that (MDT-TSF)(AuI2)0.436 exhibits the superconducting transition at a relatively high temperature despite the small electronic heat capacity coefficient γ and non-dimerized molecular arrangement in the donor layers.

Original languageEnglish
Article number074606
Journaljournal of the physical society of japan
Volume75
Issue number7
DOIs
Publication statusPublished - 2006 Jul 1
Externally publishedYes

Keywords

  • Electronic heat capacity coefficient
  • Heat capacity
  • Incommensurate lattice
  • Organic superconductor

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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