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Magnetic field induced rotation of the d-vector in Sr_2RuO_4 | | J. F. Annett
; G. Litak
; B.L. Gyorffy
; K.I. Wysokinski
; | | Date: |
6 Jun 2006 | | Subject: | Superconductivity; Materials Science | | Abstract: | The superconductor Sr_2RuO_4 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 T_c, 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 was also found to be constant below T_c, 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. | | Source: | arXiv, cond-mat/0606163 | | Services: | Forum | Review | PDF | Favorites | |
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