High field magnetization anisotropy and thermodynamic property in CeIn₃

The strongly correlated antiferromagnet CeIn₃ displays fascinating phenomena including pressure and magnetic field-induced quantum criticality, Fermi surface transformations, and unconventional superconductivity. A non-trivial phase diagram, where the suppression of the Neel temperature was found to be anisotropic by transport measurements in a large magnetic field H_c ~ 60 - 80 T, with strength comparable to the crystal field energy scale [1]. A microscopic Kondo lattice model has been developed that quantitatively reproduces the low energy magnetic excitation spectrum [2]. To validate this model, we derived the magnetic exchange interaction of the full J = 5/2 multiplet and computed the anisotropic magnetization in high magnetic field. In this talk, I will discuss magnetization measurements of cubic CeIn₃ along [100], [110], and [111] up to 60 T to derive the cubic anisotropy of the exchange interactions. The results reasonably validate our theoretical low-energy model that includes the excited crystal field levels. Moreover, we observed new energy scales around H ~ 0.5 T in low field magnetization and T ~ 3 K in specific heat measurements.

[1] P.J.W. Moll et al. npj-Quantum Materials 2, 46 (2017)

[2] W. Simeth et al. arXiv:2208.02211