Scanning SQUID Susceptometry of Sr<sub>2</sub>RuO<sub>4</sub> Under Uniaxial Pressure
ORAL
Abstract
Anisotropic strain, as applied through uniaxial pressure, is expected to lift the degeneracy between the components of the proposed px±ipy superconducting order parameter of Sr2RuO4. However, neither the resulting split transition nor the expected linear cusp in superconducting transition temperature, TC, at low strain has been observed to date. Furthermore, measurements of the critical field anisotropy suggest that the order parameter may be of even parity at high values of anisotropic strain, where TC is strongly enhanced. In this study, we will use scanning SQUID susceptometry to obtain measurements of TC and changes in the penetration depth, λ, as a function of temperature and uniaxial pressure. We image strain inhomogeneity by mapping TC with micron-scale spatial resolution and perform local measurements of the superfluid density in homogeneous regions. Penetration depth measurements yield insight into the symmetry of the order parameter and its dependence on strain.
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Presenters
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Hilary Noad
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
- Applied Physics, Stanford Univ
- Stanford Univ