Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 57: Superconductivity: Properties and Electronic Structure

TT 57.7: Vortrag

Donnerstag, 4. April 2019, 16:45–17:00, H7

Pressure tuning of CeRhIn5 microstructures — •Janas K. John1, Maja D. Bachmann1, Filip Ronning3, Eric D. Bauer3, Joe D. Thompson3, Philip J. W. Moll1,2, and Michael Nicklas11Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Laboratory of Quantum Materials, EPFL, Lausanne, Switzerland — 3Los Alamos National Laboratory, MPA-CMMS, USA

CeRhIn5 orders antiferromagnetically below TN=3.8K at ambient pressure. External pressure suppresses the antiferromagnetic state and induces an unconventional superconducting state. Motivated by the study of M. Bachmann et.al. on CeIrIn5 microstructures we revisited the pressure-temperature (pT) phase diagram of its relative CeRhIn5 utilizing microstructures to probe the electrical resistivity for well-defined crystalline directions, along the crystallographic a- and c-axes. The obtained pT phase diagram resembles the general results in literature. Once the antiferromagnetic state is suppressed, superconductivity appears. We noted slightly different superconducting transition temperatures Tc along both crystallographic directions, which might be attributed to strain inhomogeneities. The superconducting transition is first rather broad, but sharpens upon increasing pressure and approaching the maximum in Tc(p). To our surprise the temperature dependence as well as the IV curves for in-plane measurements along the a-axis follows the predictions of the Berezinskii-Kosterlitz-Thouless theory. This might hint at two-dimensional superconductivity.

[1] M. D. Bachmann et al., arxiv:1807.05079.

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