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Title: Anisotropy and multiband superconductivity in Sr 2 RuO 4 determined by small-angle neutron scattering studies of the vortex lattice [Anisotropy and multiband superconductivity in Sr 2 RuO 4 ]

Abstract

Despite numerous studies the exact nature of the order parameter in superconducting Sr 2RuO 4 remains unresolved. We have extended previous small-angle neutron scattering studies of the vortex lattice in this material to a wider field range, higher temperatures, and with the field applied close to both the <100> and <110> basal plane directions. Measurements at high field were made possible by the use of both spin polarization and analysis to improve the signal-to-noise ratio. Rotating the field towards the basal plane causes a distortion of the square vortex lattice observed for H // <001> and also a symmetry change to a distorted triangular symmetry for fields close to <100>.The vortex lattice distortion allows us to determine the intrinsic superconducting anisotropy between the c axis and the Ru-O basal plane, yielding a value of ~60 at low temperature and low to intermediate fields. This greatly exceeds the upper critical field anisotropy of ~20 at low temperature, reminiscent of Pauli limiting. Indirect evidence for Pauli paramagnetic effects on the unpaired quasiparticles in the vortex cores are observed, but a direct detection lies below the measurement sensitivity. The superconducting anisotropy is found to be independent of temperature but increases for fields >more » 1 T, indicating multiband superconductvity in Sr 2RuO 4. Lastly, the temperature dependence of the scattered intensity provides further support for gap nodes or deep minima in the superconducting gap.« less

Authors:
 [1];  [2];  [2];  [2];  [3];  [4];  [5];  [4];  [6];  [7]; ORCiD logo [2]
  1. Univ. of Notre Dame, Notre Dame, IN (United States); Duke Univ., Durham, NC (United States)
  2. Univ. of Notre Dame, Notre Dame, IN (United States)
  3. Northwestern Univ., Evanston, IL (United States); Texas A & M Univ., College Station, TX (United States)
  4. Kyoto Univ., Kyoto (Japan)
  5. Kyoto Univ., Kyoto (Japan); Fudan Univ., Shanghai (China)
  6. Institut Laue-Langevin, Grenoble (France)
  7. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Publication Date:
Research Org.:
Univ. of Notre Dame, Notre Dame, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1408758
Alternate Identifier(s):
OSTI ID: 1408791
Grant/Contract Number:  
SC0005051
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 17; 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

Citation Formats

Kuhn, S. J., Morgenlander, W., Louden, E. R., Rastovski, C., Gannon, W. J., Takatsu, H., Peets, D. C., Maeno, Y., Dewhurst, C. D., Gavilano, J., and Eskildsen, M. R. Anisotropy and multiband superconductivity in Sr2RuO4 determined by small-angle neutron scattering studies of the vortex lattice [Anisotropy and multiband superconductivity in Sr2RuO4]. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.174507.
Kuhn, S. J., Morgenlander, W., Louden, E. R., Rastovski, C., Gannon, W. J., Takatsu, H., Peets, D. C., Maeno, Y., Dewhurst, C. D., Gavilano, J., & Eskildsen, M. R. Anisotropy and multiband superconductivity in Sr2RuO4 determined by small-angle neutron scattering studies of the vortex lattice [Anisotropy and multiband superconductivity in Sr2RuO4]. United States. doi:10.1103/PhysRevB.96.174507.
Kuhn, S. J., Morgenlander, W., Louden, E. R., Rastovski, C., Gannon, W. J., Takatsu, H., Peets, D. C., Maeno, Y., Dewhurst, C. D., Gavilano, J., and Eskildsen, M. R. Tue . "Anisotropy and multiband superconductivity in Sr2RuO4 determined by small-angle neutron scattering studies of the vortex lattice [Anisotropy and multiband superconductivity in Sr2RuO4]". United States. doi:10.1103/PhysRevB.96.174507. https://www.osti.gov/servlets/purl/1408758.
@article{osti_1408758,
title = {Anisotropy and multiband superconductivity in Sr2RuO4 determined by small-angle neutron scattering studies of the vortex lattice [Anisotropy and multiband superconductivity in Sr2RuO4]},
author = {Kuhn, S. J. and Morgenlander, W. and Louden, E. R. and Rastovski, C. and Gannon, W. J. and Takatsu, H. and Peets, D. C. and Maeno, Y. and Dewhurst, C. D. and Gavilano, J. and Eskildsen, M. R.},
abstractNote = {Despite numerous studies the exact nature of the order parameter in superconducting Sr2RuO4 remains unresolved. We have extended previous small-angle neutron scattering studies of the vortex lattice in this material to a wider field range, higher temperatures, and with the field applied close to both the <100> and <110> basal plane directions. Measurements at high field were made possible by the use of both spin polarization and analysis to improve the signal-to-noise ratio. Rotating the field towards the basal plane causes a distortion of the square vortex lattice observed for H // <001> and also a symmetry change to a distorted triangular symmetry for fields close to <100>.The vortex lattice distortion allows us to determine the intrinsic superconducting anisotropy between the c axis and the Ru-O basal plane, yielding a value of ~60 at low temperature and low to intermediate fields. This greatly exceeds the upper critical field anisotropy of ~20 at low temperature, reminiscent of Pauli limiting. Indirect evidence for Pauli paramagnetic effects on the unpaired quasiparticles in the vortex cores are observed, but a direct detection lies below the measurement sensitivity. The superconducting anisotropy is found to be independent of temperature but increases for fields > 1 T, indicating multiband superconductvity in Sr2RuO4. Lastly, the temperature dependence of the scattered intensity provides further support for gap nodes or deep minima in the superconducting gap.},
doi = {10.1103/PhysRevB.96.174507},
journal = {Physical Review B},
number = 17,
volume = 96,
place = {United States},
year = {2017},
month = {11}
}

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