C. Rastovski, C. D. Dewhurst, W. J. Gannon, D. C. Peets, H. Takatsu, Y. Maeno, M. Ichioka, K. Machida, M. R. Eskildsen
The superconducting state emerges due to the formation and condensation of carrier Cooper pairs, although the exact microscopic mechanism responsible for the pairing in different materials varies and, in many cases, remains elusive. An important step towards a microscopic understanding is detailed knowledge of the superconducting order parameter. This is especially important in materials such as Sr2RuO4 and UPt3 where the carriers in the Cooper pairs are believed to form a triplet, introducing an additional degree of freedom and complexity to the problem. As a result the exact nature of the order parameter in these compounds, which have become paradigms for unconventional superconductivity, is still unresolved. We have studied the vortex lattice in Sr2RuO4 to measure the intrinsic anisotropy of the superconducting state between the c-axis and the Ru-O basal plane (~60), and found this to greatly exceed the anisotropy of the upper critical field (~20). Our result imposes significant constraints on possible models of triplet pairing in Sr2RuO4.
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http://arxiv.org/abs/1302.4810
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