Elastic Anomalies and Acoustic de Haas-van Alphen Effects in Sr2RuO4

Hiroshi Matsui, Masanori Yamaguchi, Yoshiyuki Yoshida, Atsushi Mukai, Rikio Settai, Yoshichika Ōnuki, Humihiko Takei, Naoki Toyota

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Ultrasound velocity measurements based on a phase comparison method for four different modes have been done on a copper-free layered perovskite superconductor Sr2RuO4 with Tc = 1.2 K. Anomalous softening is observed in the longitudinal C11 and C33 modes below 108 K, which is attributed to the coupling of the electronic states to the strain with г1 representation in the tetragonal point group D4th. The discontinuous change of the slope in C11 and C33 at Tc is basically explained by the second-order strain dependence of Tc, ∂2Tc/∂ɛ2uk. From the initial slope of the upper critical field Hc2, the anisotropy ratio in the coherence length is found to be 28, in agreement with previous ac susceptibility measurements. Acoustic de Haas-van Alphen oscillations for the cylindrical α-Fermi surface with 3.2m0 are observed in C33 as a function of the magnetic field applied perpendicular to the Q2D conducting plane. The area coefficient is evaluated to be |Azz| = 20士5 from the Kataoka-Goto model. The multiband term [formula omitted] contributes dominantly to |Azz|, which corresponds to the interband charge transfer.

Original languageEnglish
Pages (from-to)3687-3690
Number of pages4
Journaljournal of the physical society of japan
Volume67
Issue number11
DOIs
Publication statusPublished - 1998

Keywords

  • SrRuO
  • acoustic dHvA effect
  • elastic constant
  • superconductor
  • ultrasound velocity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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