In-Plane Anisotropy of Upper Critical Field in Sr2RuO4

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

Research output: Contribution to journalArticle

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Abstract

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
Volume84
Issue number5
DOIs
StatePublished - Jan 31 2000

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anisotropy
misalignment
specific heat
magnetic permeability
magnetic fields

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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Mao, Z. Q. ; Maeno, Y. ; NishiZaki, S. ; Akima, T. ; Ishiguro, T. / In-Plane Anisotropy of Upper Critical Field in Sr2RuO4. In: Physical Review Letters. 2000 ; Vol. 84, No. 5. pp. 991-994.
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Mao, ZQ, Maeno, Y, NishiZaki, S, Akima, T & Ishiguro, T 2000, 'In-Plane Anisotropy of Upper Critical Field in Sr2RuO4', Physical Review Letters, vol. 84, no. 5, pp. 991-994. https://doi.org/10.1103/PhysRevLett.84.991

In-Plane Anisotropy of Upper Critical Field in Sr2RuO4. / Mao, Z. Q.; Maeno, Y.; NishiZaki, S.; Akima, T.; Ishiguro, T.

In: Physical Review Letters, Vol. 84, No. 5, 31.01.2000, p. 991-994.

Research output: Contribution to journalArticle

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AB - 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.

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