Specific heat of CeRhIn${}_5$ in high magnetic fields: Magnetic phase diagram revisited

Abstract

CeRhIn${}_5$ is a prototypical antiferromagnetic heavy-fermion compound, whose behavior in a magnetic field is unique. A magnetic field applied in the basal plane of the tetragonal crystal structure induces two additional phase transitions. When the magnetic field is applied along, or close to, the $c$ axis, a new phase characterized by a pronounced in-plane electronic anisotropy emerges at $B^{\ast }\approx$ 30 T, well below the critical field, $B_c\simeq$ 50 T, to suppress the antiferromagnetic order. The exact origin of this new phase, originally suggested to be an electronic-nematic state, remains elusive. Here we report low-temperature specific-heat measurements in CeRhIn${}_5$ in high static magnetic fields up to 36 T applied along both the $a$ and $c$ axes. For fields applied along the $a$ axis, we confirmed the previously suggested phase diagram, and extended it to higher fields. This allowed us to observe a triple point at $\sim$ 30 T, where the first-order transition from an incommensurate to commensurate magnetic structure merges into the onset of the second-order antiferromagnetic transition. For fields applied along the $c$ axis, we observed a small but distinct anomaly at $B^{\ast }$, which we discuss in terms of a possible field-induced transition, probably weakly first-order. We further suggest that the transition corresponds to a change of magnetic structure. We revise magnetic phase diagrams of CeRhIn${}_5$ for both principal orientations of the magnetic field based entirely on thermodynamic anomalies.

arXiv comment6 pages, 5 figures + Supplemental Material (2 pages, 2 figures)

References in corpus (19)

• Nematic order in iron superconductors - who is in the driver's seat?
• Calorimetric Evidence for a Fulde-Ferrell-Larkin-Ovchinnikov Superconducting State in the Layered Organic Superconductor κ$-(BEDT-TTF)$_2$Cu(NCS)$_2$
• Incommensurate magnetic structure of CeRhIn5
• Electronic in-plane symmetry breaking at field-tuned quantum criticality in CeRhIn5
• Multiple quantum phase transitions in a heavy fermion antiferromagnet
• Fermi surface reconstruction and multiple quantum phase transitions in the antiferromagnet CeRhIn${}_5$
• Field-induced magnetic transitions in the quasi-two-dimensional heavy-fermion antiferromagnets Ce_{n}RhIn_{3n+2} (n=1 or 2)
• Hidden order and beyond: an experimental-theoretical overview of the multifaceted behavior of URu${}_2$Si${}_2$
• Field induced density wave in the heavy fermion compound CeRhIn5
• Non-monotonic pressure dependence of high-field nematicity and magnetism in CeRhIn${}_5$
• Magnetic structure of CeRhIn${}_5$ under magnetic field
• Enhanced hybridization sets the stage for electronic nematicity in CeRhIn5
• Tunable Emergent Heterostructures in a Prototypical Correlated Metal
• 40-tesla pulsed-field cryomagnet for single crystal neutron diffraction
• Enhancement of the effective mass at high magnetic fields in CeRhIn${}_5$
• High-Field Ultrasonic Study of Quadrupole Ordering and Crystal Symmetry Breaking in CeRhIn5
• Orbitally defined field-induced electronic state in a Kondo lattice
• High magnetic field thermal-expansion and elastic properties of CeRhIn${}_5$
• Robust Fermi-Surface Morphology of CeRhIn${}_5$ across the Putative Field-Induced Quantum Critical Point

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