Basal-plane magnetic anisotropies of high-κ d-wave superconductors in a mixed state: A quasiclassical approach

Hiroto Adachi, Predrag Miranović, Masanori Ichioka, Kazushige Machida

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Abstract

We study the basal-plane anisotropies of reversible magnetization and torque in a mixed state of layered d-wave superconductors based on the quasiclassical version of the BCS-Gor'kov theory. Both the longitudinal magnetization (M L) and torque (τ) show fourfold oscillations as a function of the field angle χ. The relationship between the node position and the oscillatory patterns shown by M L and τ is clarified. It is also shown that the sign of the τ(χ)-oscillation does not change between H c1 and H c2, while the sign of the M L(χ)-oscillation changes. The newly obtained result for τ indicates that the torque experiment can allow us to detect the in-plane anisotropies of H c2 even in a material with strong fluctuations such as cuprate or organic superconductors, where the H c2 itself cannot be determined experimentally.

Original languageEnglish
Article number084716
JournalJournal of the Physical Society of Japan
Volume75
Issue number8
DOIs
Publication statusPublished - Aug 2006

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Keywords

  • d-wave superconductor
  • In-plane anisotropy
  • Magnetization
  • Mixed state
  • Torque

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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