In-Plane Anisotropy of Upper Critical Field in Sr2RuO4

Z. Q. Mao, Y. Maeno, S. NishiZaki, T. Akima, T. Ishiguro

Research output: Contribution to journalArticlepeer-review

91 Scopus citations


We investigated the behavior of the spin-triplet superconductor Sr2RuO4 (Tc≈1.5 K) under the magnetic fields parallel to the quasi-two-dimensional plane. The upper critical field Hc2 exhibits a clear fourfold anisotropy of about 3% at 0.35 K. Furthermore, we detected an additional transition feature below Hc2 in both the ac susceptibility and the specific heat. These second-transition features as well as the pronounced in-plane Hc2 anisotropy disappear above 0.8 K or under intentional field misalignment of less than 1°. Most of these characteristics are consistent with the predicted emergence of the second superconducting phase with a line-node gap.

Original languageEnglish (US)
Pages (from-to)991-994
Number of pages4
JournalPhysical review letters
Issue number5
StatePublished - Jan 31 2000

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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