Non-monotonic pressure dependence of high-field nematicity and magnetism in CeRhIn5

Toni Helm (), Audrey D. Grockowiak, Fedor F. Balakirev, John Singleton, Jonathan B. Betts, Kent R. Shirer, Markus König, Tobias Förster, Eric D. Bauer, Filip Ronning, Stanley W. Tozer and Philip J. W. Moll ()
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Toni Helm: Max Planck Institute for Chemical Physics of Solids
Audrey D. Grockowiak: National High Magnetic Field Laboratory
Fedor F. Balakirev: MS-E536, Los Alamos National Laboratory
John Singleton: MS-E536, Los Alamos National Laboratory
Jonathan B. Betts: MS-E536, Los Alamos National Laboratory
Kent R. Shirer: Max Planck Institute for Chemical Physics of Solids
Markus König: Max Planck Institute for Chemical Physics of Solids
Tobias Förster: Helmholtz-Zentrum Dresden-Rossendorf
Eric D. Bauer: Los Alamos National Laboratory
Filip Ronning: Los Alamos National Laboratory
Stanley W. Tozer: National High Magnetic Field Laboratory
Philip J. W. Moll: Max Planck Institute for Chemical Physics of Solids

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract CeRhIn5 provides a textbook example of quantum criticality in a heavy fermion system: Pressure suppresses local-moment antiferromagnetic (AFM) order and induces superconductivity in a dome around the associated quantum critical point (QCP) near pc ≈ 23 kbar. Strong magnetic fields also suppress the AFM order at a field-induced QCP at Bc ≈ 50 T. In its vicinity, a nematic phase at B* ≈ 28 T characterized by a large in-plane resistivity anisotropy emerges. Here, we directly investigate the interrelation between these phenomena via magnetoresistivity measurements under high pressure. As pressure increases, the nematic transition shifts to higher fields, until it vanishes just below pc. While pressure suppresses magnetic order in zero field as pc is approached, we find magnetism to strengthen under strong magnetic fields due to suppression of the Kondo effect. We reveal a strongly non-mean-field-like phase diagram, much richer than the common local-moment description of CeRhIn5 would suggest.

Date: 2020
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DOI: 10.1038/s41467-020-17274-6

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