Acoustic de Haas-van Alphen Effect in Organic Superconductor α-(BEDT-TTF)2NH4Hg(SCN)4

Hiroshi Matsui, Masanori Yamaguchi, Satoshi Endo, Tomoaki Inuzuka, Hiroshi Uozaki, Naoki Toyota

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Longitudinal sound velocity measurements propagating along the interlayer direction have been performed at 53.4 MHz by a phase comparison method on a quasi-two-dimensional (Q2D) organic superconductor α-(BEDT-TTF)2NH4Hg(SCN)4 with Tc = 1 K. Temperature dependence of the sound velocity shows anomalies around 20 K and 60 K. The acoustic de Haas-van Alphen (dHvA) effects are observed below 1.8 K for the first time in these organic metals. The quantum oscillations originate from the α-Fermi surface (FS) of a weakly warped cylindrical shape. According to the theoretical formulations by Kataoka and Goto for an acoustic dHvA effect, the absolute area coefficient |ΛL| is estimated to be about 3.5. The multiband term ΛmL is concluded to dominantly contribute to |ΛL|.

Original languageEnglish
Pages (from-to)2586-2589
Number of pages4
Journaljournal of the physical society of japan
Volume67
Issue number8
DOIs
Publication statusPublished - 1998 Aug
Externally publishedYes

Keywords

  • Acoustic de haas-van alphen effect
  • Electron-lattice coupling
  • Two-dimensional system
  • Ultrasound
  • α-(BEDT-TTF)NHHg(SCN)

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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