Resolving the spin and orbital part of the Sr2RuO4 superconducting order parameter
Stronthium ruthenate (SRO) has long been considered a paradigm for p-wave superconductivity, but recent results have raised important questions in this regard. These include recent SANS experiments by our group [C. Rastovski et al., Phys. Rev. Lett. 111, 087003 (2013)] that found an intrinsic superconducting anisotropy 3 times greater than the Hc2 anisotropy, and the observation of a first order transition at the upper critical fields for T < 0.8 Tc. Both of these results suggest Pauli limiting in SRO, and are difficult to reconcile with equal spin pairing. However, there is still other compelling evidence for p-wave pairing, and it is therefore important to resolve the nature of the superconducting state in SRO. We propose a continuation of our SANS measurements of the SRO vortex lattice (VL) to provide further information about the order parameter. Two distinct measurements are foreseen: 1. High fields studies to investigate possible Pauli paramagnetic effects that would support Pauli limiting. 2. T-dependence for different directions of in-plane directions to directly resolve gap nodes.
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M. R. Eskildsen; DE WAARD Elizabeth; DEWHURST Charles; KUHN Stephen; William Morgenlander; Jason Saroni and WHITE Jonathan. (2015). Resolving the spin and orbital part of the Sr2RuO4 superconducting order parameter. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-42-389
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