Enhancement of the effective mass at high magnetic fields in CeRhIn${}_5$

Abstract

The Kondo-lattice compound CeRhIn${}_5$ displays a field-induced Fermi surface reconstruction at $B^{\ast }\approx 30$ T, which occurs within the antiferromagnetic state, prior to the quantum critical point at $B_{c0}\approx 50$ T. Here, in order to investigate the nature of the Fermi surface change, we measured the magnetostriction, specific heat, and magnetic torque of CeRhIn${}_5$ across a wide range of magnetic fields. Our observations uncover the field-induced itineracy of the $4f$ electrons, where above $B_{\mathrm{onset}}\approx 17$ T there is a significant enhancement of the Sommerfeld coefficient, and spin-dependent effective cyclotron masses determined from quantum oscillations. Upon crossing $B_{\mathrm{onset}}$, the temperature dependence of the specific heat also shows distinctly different behavior from that at low fields. Our results indicate that the Kondo coupling is remarkably robust upon increasing the magnetic field. This is ascribed to the delocalization of the $4f$ electrons at the Fermi surface reconstruction at $B^{\ast }$.

arXiv comment7 pages, 4 figures

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• Non-monotonic pressure dependence of high-field nematicity and magnetism in CeRhIn${}_5$
• Deconfined criticality and ghost Fermi surfaces at the onset of antiferromagnetism in a metal
• 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
• Origin of the 30 T transition in CeRhIn${}_5$ in tilted magnetic fields
• Simultaneous measurement of specific heat and thermal conductivity in pulsed magnetic fields
• Robust Fermi-Surface Morphology of CeRhIn${}_5$ across the Putative Field-Induced Quantum Critical Point
• Exotic magnetic phase diagram and extremely robust antiferromagnetism in Ce${}_2$RhIn${}_8$