Micron-scale measurements of low anisotropic strain response of local $$T_c$$ in Sr$$_2$$RuO$$_4$$
Abstract
Strontium ruthenate (Sr$$_2$$RuO$$_4$$) 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 Sr$$_2$$RuO$$_4$$ as a function of temperature, uniaxial pressure, and position with micron-scale spatial resolution. We thereby obtained local measurements of the superconducting transition temperature $$T_c$$ vs. anisotropic strain $$\epsilon$$ with sufficient sensitivity for comparison to theoretical models that assume a uniform $$p_x\pm ip_y$$ order parameter. We found that $$T_c$$ varies with position and that the locally measured $$T_c$$ vs. $$\epsilon$$ curves are quadratic ($$T_c\propto\epsilon^2$$), as allowed by the C$$_4$$ symmetry of the crystal lattice. We did not observe the low-strain linear cusp ($$T_c\propto \left| \epsilon \right|$$) that would be expected for a two-component order parameter such as $$p_x\pm ip_y$$. Lastly, these results provide new input for models of the order parameter of Sr$$_2$$RuO$$_4$$.
- Authors:
-
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Sciences
- Univ. of St. Andrews, St. Andrews (United Kingdom). Scottish Univ. Physics Alliance, School of Physics and Astronomy; STFC Rutherford Appleton Lab., Didcot (United Kingdom)
- Univ. of St. Andrews, St. Andrews (United Kingdom). Scottish Univ. Physics Alliance, School of Physics and Astronomy; Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
- Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE
- OSTI Identifier:
- 1466112
- Alternate Identifier(s):
- OSTI ID: 1474003
- Report Number(s):
- APS/123-QED
Journal ID: ISSN 2469-9950
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 98; Journal Issue: 9; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Condensed matter physics; Superconductivity; Materials science
Citation Formats
Moler, Kathryn Ann, Watson, Christopher A., Gibbs, Alexander S., Mackenzie, Andrew P., and Hicks, Clifford W. Micron-scale measurements of low anisotropic strain response of local $T_c$ in Sr$_2$RuO$_4$. United States: N. p., 2018.
Web. doi:10.1103/PhysRevB.98.094521.
Moler, Kathryn Ann, Watson, Christopher A., Gibbs, Alexander S., Mackenzie, Andrew P., & Hicks, Clifford W. Micron-scale measurements of low anisotropic strain response of local $T_c$ in Sr$_2$RuO$_4$. United States. https://doi.org/10.1103/PhysRevB.98.094521
Moler, Kathryn Ann, Watson, Christopher A., Gibbs, Alexander S., Mackenzie, Andrew P., and Hicks, Clifford W. Wed .
"Micron-scale measurements of low anisotropic strain response of local $T_c$ in Sr$_2$RuO$_4$". United States. https://doi.org/10.1103/PhysRevB.98.094521. https://www.osti.gov/servlets/purl/1466112.
@article{osti_1466112,
title = {Micron-scale measurements of low anisotropic strain response of local $T_c$ in Sr$_2$RuO$_4$},
author = {Moler, Kathryn Ann and Watson, Christopher A. and Gibbs, Alexander S. and Mackenzie, Andrew P. and Hicks, Clifford W.},
abstractNote = {Strontium ruthenate (Sr$_2$RuO$_4$) 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 Sr$_2$RuO$_4$ as a function of temperature, uniaxial pressure, and position with micron-scale spatial resolution. We thereby obtained local measurements of the superconducting transition temperature $T_c$ vs. anisotropic strain $\epsilon$ with sufficient sensitivity for comparison to theoretical models that assume a uniform $p_x\pm ip_y$ order parameter. We found that $T_c$ varies with position and that the locally measured $T_c$ vs. $\epsilon$ curves are quadratic ($T_c\propto\epsilon^2$), as allowed by the C$_4$ symmetry of the crystal lattice. We did not observe the low-strain linear cusp ($T_c\propto \left| \epsilon \right|$) that would be expected for a two-component order parameter such as $p_x\pm ip_y$. Lastly, these results provide new input for models of the order parameter of Sr$_2$RuO$_4$.},
doi = {10.1103/PhysRevB.98.094521},
journal = {Physical Review B},
number = 9,
volume = 98,
place = {United States},
year = {Wed Sep 26 00:00:00 EDT 2018},
month = {Wed Sep 26 00:00:00 EDT 2018}
}
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