Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 38: f-Electron Systems and Heavy Fermions
TT 38.3: Vortrag
Mittwoch, 3. April 2019, 10:15–10:30, H23
The high-field/high-pressure relationship of magnetic order and nematicity in the heavy-fermion superconductor CeRhIn5 — •Toni Helm1,2, Audrey Grockowiak4, Fedor Balakirev5, John Singleton5, Kent R. Shirer2, Markus König2, Eric D. Bauer6, Filip Ronning6, Stanley W. Tozer4, and Philip J.W. Moll2,3 — 1High Magnetic Field Laboratory Dresden (HLD-EMFL), HZDR, Germany — 2MPI for Chemical Physics of Solids, Dresden, Germany — 3Institute of Materials, EPFL, Lausanne, Switzerland — 4Tallahassee NHMFL, FL, USA — 5Los Alamos NHMFL, NM, USA — 6Los Alamos National Laboratory, NM, USA
Recently, a nematic signature, i.e., a sudden resistivity anisotropy above a critical field B* = 28 T, has been observed in CeRhIn5. This heavy-fermion antiferromagnet (TN = 3.85 K) superconducts under pressure above pc = 23 kbar, associated with an antiferromagnetic quantum critical point (QCP). The reported nematic behavior survives at ambient pressure only until magnetic order is suppressed at a critical field of Bc =51 T, associated with a second QCP. An open question is if and how the two QCPs, B-induced nematicity and p-induced superconductivity (SC) are related. Here we report high-field (up to 65 T) / high-pressure (up to 40 kbar) studies of magnetotransport in CeRhIn5. The combination of plastic diamond-anvil-cells, pulsed magnets, and focused-ion-beam microstructures enables us to investigate this region in the (p,T,B) phase diagram. We show that nematicity and SC reside in distinct regions. Our experiments reveal an unexpected enhancement of magnetic order in high fields with pressure.