Direct evidence for a pressure-induced nodal superconducting gap in the Ba0.65Rb0.35Fe2As2 superconductor

Z. Guguchia (), A. Amato, Jia-Ning Kang, H. Luetkens, P. K. Biswas, G. Prando, F. von Rohr, Z. Bukowski, A. Shengelaya, H. Keller, E. Morenzoni, Rafael M. Fernandes and R. Khasanov
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Z. Guguchia: Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute
A. Amato: Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute
H. Luetkens: Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute
P. K. Biswas: Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute
G. Prando: Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden
F. von Rohr: Physik-Institut der Universität Zürich
Z. Bukowski: Institute of Low Temperature and Structure Research, Polish Academy of Sciences
A. Shengelaya: Tbilisi State University
H. Keller: Physik-Institut der Universität Zürich
E. Morenzoni: Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute
Rafael M. Fernandes: School of Physics and Astronomy, University of Minnesota
R. Khasanov: Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract The superconducting gap structure in iron-based high-temperature superconductors (Fe-HTSs) is non-universal. In contrast to 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.

Date: 2015
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DOI: 10.1038/ncomms9863

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