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

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Helm,  Toni
Physics of Microstructured Quantum Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Shirer,  Kent R.
Physics of Microstructured Quantum Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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König,  Markus
Markus König, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Moll,  Philip J. W.
Physics of Microstructured Quantum Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Helm, T., Grockowiak, A. D., Balakirev, F. F., Singleton, J., Betts, J. B., Shirer, K. R., et al. (2020). Non-monotonic pressure dependence of high-field nematicity and magnetism in CeRhIn5. Nature Communications, 11: 3482, pp. 1-10. doi:10.1038/s41467-020-17274-6.


Cite as: http://hdl.handle.net/21.11116/0000-0006-C752-D
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. © 2020, The Author(s).