Fourfold symmetric anisotropy in the CuO2 planes of 60-K YBa2Cu3O7 − δ single crystals

Tomoyuki Naito, Seiya Haraguchi, Hideo Iwasaki, Takahiko Sasaki, Terukazu Nishizaki, Kenji Shibata, Norio Kobayashi

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17 Citations (Scopus)


To study the anisotropy in the CuO2 planes, the in-plane resistivity ρ has been measured on 60 K YBa2Cu3O7 − δ YBCO) single crystal as a function of the angle θ between the directions of a magnetic field H and of the b axis under magnetic fields precisely parallel to the CuO2 planes. Angular dependence of the resistivity ρ(θ) is mainly described by the fourfold symmetry, and a dip structure appears in ρ(θ) when the magnetic field is applied parallel to the a and b axes. The fourfold symmetry of the in-plane anisotropy of the resistivity is first observed in YBCO system. It is shown that the obtained results have a very close relation to the anisotropy which comes from the superconducting energy gap of the d-wave pairing with dx2 − y2 symmetry and the effect of the directional vortex pinning.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number17
Publication statusPublished - 2001


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