Micron-scale measurements of low anisotropic strain response of local in SrRuO
arXiv:1807.07197 · doi:10.1103/PhysRevB.98.094521
Abstract
Strontium ruthenate (SrRuO) is a multiband superconductor that displays evidence of topological superconductivity, although a model of the order parameter that is consistent with all experiments remains elusive. We integrated a piezoelectric-based strain apparatus with a scanning superconducting quantum interference device (SQUID) microscope to map the diamagnetic response of single-crystal SrRuO as a function of temperature, uniaxial pressure, and position with micron-scale spatial resolution. We thereby obtained local measurements of the superconducting transition temperature vs. anisotropic strain with sufficient sensitivity for comparison to theoretical models that assume a uniform order parameter. We found that varies with position and that the locally measured vs. curves are quadratic (), as allowed by the C symmetry of the crystal lattice. We did not observe the low-strain linear cusp () that would be expected for a two-component order parameter such as . These results provide new input for models of the order parameter of SrRuO.
arXiv comment18 pages, 6 figures, 2 tables
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