Exotic magnetic phase diagram and extremely robust antiferromagnetism in Ce${}_2$RhIn${}_8$

Abstract

The antiferromagnetic heavy-fermion compound Ce${}_2$RhIn${}_8$ belongs to the same family and bears similarities with the well-studied prototypical material CeRhIn${}_5$, which demonstrates a unique behavior under applied magnetic field. Here, we report specific-heat measurements on a high-quality single crystal of Ce${}_2$RhIn${}_8$ in magnetic fields up to 35 T applied along both principal crystallographic directions. When the magnetic field is applied along the $a$ axis of the tetragonal crystal structure, two additional field-induced antiferromagnetic phases are observed, in agreement with previous reports. One of them is confined in a small area of the field-temperature phase diagram. The other one, which develops above $\sim$2.5 T, is very robust against the field. Its transition temperature increases with field, reaches a maximum at $\sim$12 T, and then starts to decrease. However, it tends to saturate towards the highest field of our measurements. For a field applied along the $c$ axis, the Néel temperature, $T_N$, initially decreases with field, as expected for a typical antiferromagnet. Surprisingly, an additional phase emerges above $\sim$10 T. It is most likely to be of the same origin as its counterpart observed above 2.5 T for the other field orientation. This phase is also unusually robust: Its transition temperature increases all the way up to 35 T, where it exceeds the zero field $T_N=$~2.85 K. Finally, for both field directions, the phase diagrams contain rarely observed tricritical points of second-order phase transitions.

arXiv comment6 pages, 4 figures. Accepted for publication as a Letter in Phys. Rev. B

References in corpus (27)

• Superconducting phases of f-electron compounds
• Thermodynamic signatures of quantum criticality in cuprates
• Incommensurate magnetic structure of CeRhIn5
• Multiple superconducting phases in a nearly ferromagnetic system
• Superconductivity and Magnetism in a New Class of Heavy-Fermion Materials
• 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)
• Magnetic Structure of Heavy Fermion Ce2RhIn8
• Field-induced tuning of the pairing state in a superconductor
• Field induced density wave in the heavy fermion compound CeRhIn5
• Magnetic structure of CeRhIn${}_5$ under magnetic field
• Magnetism, Superconductivity and Quantum Criticality in the Multi-Site Cerium Heavy Fermion Compound Ce3PtIn11
• Ambient Pressure Superconductivity emerging in the Local Moment Antiferromagnetic Phase of Ce${}_3$PdIn${}_{11}$
• Magnetic field driven complex phase diagram of antiferromagnetic heavy-fermion superconductor Ce${}_3$PtIn${}_{11}$
• Enhanced hybridization sets the stage for electronic nematicity in CeRhIn5
• Tunable Emergent Heterostructures in a Prototypical Correlated Metal
• 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
• Specific heat of CeRhIn${}_5$ in high magnetic fields: Magnetic phase diagram revisited
• Anisotropic magnetotransport and magnetic phase diagrams of the antiferromagnetic heavy-fermion superconductor Ce${}_3$PdIn${}_{11}$
• High magnetic field thermal-expansion and elastic properties of CeRhIn${}_5$
• Specific heat in high magnetic fields and magnetic phase diagram of CePt${}_2$In${}_7$
• Origin of the 30 T transition in CeRhIn${}_5$ in tilted magnetic fields
• Neutron-diffraction study of field-induced transitions in the heavy-fermion compound Ce2RhIn8