Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 47: Spincaloric Transport I (jointly with TT)

MA 47.6: Talk

Thursday, April 3, 2014, 18:00–18:15, HSZ 403

The anomalous Nernst effect in the triplet superconductor Sr₂RuO₄ — •Martin Gradhand¹, Karol I. Wysokinski², and James F. Annett¹ — ¹H . H. Wills Physics Laboratory, University of Bristol, Tyndall Ave, BS8-1TL, UK — ²Institute of Physics, M. Curie-Skłodowska University, Radziszewskiego 10, PL-20-031 Lublin, Poland

The existence of the time reversal symmetry breaking in the superconducting state of Sr₂RuO₄ is crucial for the understanding of the pairing mechanism in this material. It is believed to show triplet p-wave pairing with a finite orbital and spin momentum. The measured optical Kerr effect [1] in its superconducting state caused enormous theoretical effort with different possible explanations. [2]

Another way to proof or disproof the existence of the time reversal symmetry breaking would be highly desirable. Here we present, two routes strongly related to each other. On one hand we address the existence and magnitude of the orbital magnetic moment relying on the Berry curvature expression for periodic crystals. On the other hand we will discuss the possibility of a superconducting current induced by temperature gradients - the anomalous Nernst effect.

[1] J. Xia, et al. Phys. Rev. Lett. 97, 167002 (2006)

[2] V. M. Yakovenko Phys. Rev. Lett.98 087003 (2007), V. P. Mineev Phys. Rev. B 76 212501 (2007), E. Taylor C. Kallin Phys. Rev. Lett. 108 157001 (2012), M. Gradhand et al. Phys. Rev. B 88, 094504 (2013)