Magnetic field induced rotation of the d-vector in the spin triplet superconductor Sr${}_2$RuO${}_4$

Abstract

In zero magnetic field the superconductor Sr${}_2$RuO${}_4$ is believed to have a chiral spin triplet pairing state in which the gap function d-vector is aligned along the crystal c-axis. Using a phenomenological but orbital specific description of the spin dependent electron-electron attraction and a realistic quantitative account of the electronic structure in the normal state we analyze the orientation of the spin triplet Cooper pair d-vector in response to an external c-axis magnetic field. We show that for suitable values of the model parameters a c-axis field of only 20 mT is able to cause a reorientation phase transition of the d-vector from along $c$ to the $a-b$ plane, in agreement with recent experiments.

6 pages, 7 figures. Submitted Phys Rev B

References in corpus (2)

• High Resolution Polar Kerr Effect Measurements of Sr2RuO4: Evidence for Broken Time Reversal Symmetry in the Superconducting State
• Magnetic field induced rotation of the d-vector in Sr_2RuO_4