Direct evidence for a pressure-induced nodal superconducting gap in the Ba0.65Rb0.35Fe2As2 superconductor
Abstract
The superconducting gap structure in iron-based high-temperature superconductors (Fe-HTSs) is non-universal. Contrasting with other unconventional superconductors, in the Fe-HTSs both d-wave and extended s-wave pairing symmetries are close in energy. Probing the proximity between these very different superconducting states and identifying experimental parameters that can tune them is of central interest. Here we report high-pressure muon spin rotation experiments on the temperature-dependent magnetic penetration depth in the optimally doped nodeless s-wave Fe-HTS Ba0.65Rb0.35Fe2As2. Upon pressure, a strong decrease of the penetration depth in the zero-temperature limit is observed, while the superconducting transition temperature remains nearly constant. More importantly, the low-temperature behaviour of the inverse-squared magnetic penetration depth, which is a direct measure of the superfluid density, changes qualitatively from an exponential saturation at zero pressure to a linear-in-temperature behaviour at higher pressures, indicating that hydrostatic pressure promotes the appearance of nodes in the superconducting gap.
- Authors:
-
[3];
- Paul Scherrer Inst. (PSI), Villigen (Switzerland)
- Univ. of Minnesota, Minneapolis, MN (United States)
- Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
- Univ. of Zurich (Switzerland)
- Polish Academy of Sciences (PAS), Wroclaw (Poland). Inst. of Low Temperature and Structure Research
- Tbilisi State Univ., Tbilisi (Georgia)
- Publication Date:
- Research Org.:
- Paul Scherrer Inst. (PSI), Villigen (Switzerland)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1239551
- Grant/Contract Number:
- SC0012336
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 6; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Guguchia, Z., Amato, A., Kang, J., Luetkens, H., Biswas, P. K., Prando, G., von Rohr, F., Bukowski, Z., Shengelaya, A., Keller, H., Morenzoni, E., Fernandes, Rafael M., and Khasanov, R. Direct evidence for a pressure-induced nodal superconducting gap in the Ba0.65Rb0.35Fe2As2 superconductor. United States: N. p., 2015.
Web. doi:10.1038/ncomms9863.
Guguchia, Z., Amato, A., Kang, J., Luetkens, H., Biswas, P. K., Prando, G., von Rohr, F., Bukowski, Z., Shengelaya, A., Keller, H., Morenzoni, E., Fernandes, Rafael M., & Khasanov, R. Direct evidence for a pressure-induced nodal superconducting gap in the Ba0.65Rb0.35Fe2As2 superconductor. United States. https://doi.org/10.1038/ncomms9863
Guguchia, Z., Amato, A., Kang, J., Luetkens, H., Biswas, P. K., Prando, G., von Rohr, F., Bukowski, Z., Shengelaya, A., Keller, H., Morenzoni, E., Fernandes, Rafael M., and Khasanov, R. Mon .
"Direct evidence for a pressure-induced nodal superconducting gap in the Ba0.65Rb0.35Fe2As2 superconductor". United States. https://doi.org/10.1038/ncomms9863. https://www.osti.gov/servlets/purl/1239551.
@article{osti_1239551,
title = {Direct evidence for a pressure-induced nodal superconducting gap in the Ba0.65Rb0.35Fe2As2 superconductor},
author = {Guguchia, Z. and Amato, A. and Kang, J. and Luetkens, H. and Biswas, P. K. and Prando, G. and von Rohr, F. and Bukowski, Z. and Shengelaya, A. and Keller, H. and Morenzoni, E. and Fernandes, Rafael M. and Khasanov, R.},
abstractNote = {The superconducting gap structure in iron-based high-temperature superconductors (Fe-HTSs) is non-universal. Contrasting with other unconventional superconductors, in the Fe-HTSs both d-wave and extended s-wave pairing symmetries are close in energy. Probing the proximity between these very different superconducting states and identifying experimental parameters that can tune them is of central interest. Here we report high-pressure muon spin rotation experiments on the temperature-dependent magnetic penetration depth in the optimally doped nodeless s-wave Fe-HTS Ba0.65Rb0.35Fe2As2. Upon pressure, a strong decrease of the penetration depth in the zero-temperature limit is observed, while the superconducting transition temperature remains nearly constant. More importantly, the low-temperature behaviour of the inverse-squared magnetic penetration depth, which is a direct measure of the superfluid density, changes qualitatively from an exponential saturation at zero pressure to a linear-in-temperature behaviour at higher pressures, indicating that hydrostatic pressure promotes the appearance of nodes in the superconducting gap.},
doi = {10.1038/ncomms9863},
journal = {Nature Communications},
number = ,
volume = 6,
place = {United States},
year = {Mon Nov 09 00:00:00 EST 2015},
month = {Mon Nov 09 00:00:00 EST 2015}
}
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