Magnetic field induced rotation of the d-vector in Sr2RuO4

JF Annett, G Litak, BL Gyorffy, KL Wysokiński

Research output: Contribution to journalArticle (Academic Journal)

4 Citations (Scopus)

Abstract

The superconductor Sr2RuO4 is widely believed to be a spin triplet system with a chiral order parameter analogous to the A phase of superfluid helium-3. The best evidence for this pairing state is that the Knight shift or spin susceptibility measured in neutron scattering is constant below Tc, unlike in a spin-singlet superconductor. The original Knight shift and neutron scattering measurements were performed for magnetic fields aligned in the ruthenate a–b plane. These would be consistent with a triplet d-vector d(k) aligned along the c-axis. However, recently the Knight shift for fields along c-axis was also found to be constant below Tc, which is not expected for this symmetry state. In this paper, we show that while spin–orbit interaction stabilises the c-axis oriented d-vector, it is possible that only a very small external B field may be sufficient to rotate the d-vector into the a–b plane. In this case, the triplet pairing model remains valid. We discuss characteristics of the transition and the prospects to detect it in thermodynamic quantities.
Translated title of the contributionMagnetic field induced rotation of the d-vector in Sr2RuO4
Original languageEnglish
Pages (from-to)995 - 996
Number of pages2
JournalPhysica C: Superconductivity and its Applications
Volume460-462
DOIs
Publication statusPublished - Sep 2007

Bibliographical note

Publisher: Elsevier Science

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