Three-dimensional critical phase diagram of the Ising antiferromagnet CeRh${}_2$Si${}_2$ under intense magnetic field and pressure

Abstract

Using novel instrumentation to combine extreme conditions of intense pulsed magnetic field up to 60~T and high pressure up to 4~GPa, we have established the three-dimensional (3D) magnetic field - pressure - temperature phase diagram of a pure stoichiometric heavy-fermion antiferromagnet (CeRh${}_2$Si${}_2$). We find a temperature- and pressure-dependent decoupling of the critical and pseudo-metamagnetic fields, at the borderlines of antiferromagnetism and strongly-correlated paramagnetism. This 3D phase diagram is representative of a class of heavy-fermion Ising antiferromagnets, where long-range magnetic ordering is decoupled from a maximum in the magnetic susceptibility. The combination of extreme conditions enabled us to characterize different quantum phase transitions, where peculiar quantum critical properties are revealed. The interest to couple the effects of magnetic field and pressure on quantum-critical correlated-electron systems is stressed.

arXiv comment12 pages, 11 figures, 1 appendix, to be published in Physical Review B

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• High-resolution resonant inelastic soft X-ray scattering as a probe of the crystal electrical field in lanthanides demonstrated for the case of CeRh2Si2
• Quantum Phase Transitions in Ba(1-x)CaxFe12O19
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• Robust intralayer antiferromagnetism and tricriticality in a van der Waals compound: VBr3 case
• Fermi-surface reconstruction at the metamagnetic high-field transition in uranium mononitride
• High-pressure study of the ground- and superconducting-state properties of CeAu${}_2$Si${}_2$
• Structural and magnetic properties of antiferromagnetic Ce${}_2$IrGa${}_{12}$
• UI${}_3$ -- 5f-electron magnetic van der Waals material
• Boosted magnetic fluctuations at the onset of superconductivity in UTe${}_2$ beyond 40 T