Abstract
Metals containing cerium exhibit a diverse range of fascinating phenomena including heavy fermion behavior, quantum criticality, and novel states of matter such as unconventional superconductivity. The cubic system CeIn3 has attracted significant attention as a structurally isotropic Kondo lattice material possessing the minimum required complexity to still reveal this rich physics. By using magnetic fields with strengths comparable to the crystal field energy scale, we illustrate a strong field-induced anisotropy as a consequence of non-spherically symmetric spin interactions in the prototypical heavy fermion material CeIn3. This work demonstrates the importance of magnetic anisotropy in modeling f-electron materials when the orbital character of the 4f wavefunction changes (e.g., with pressure or composition). In addition, magnetic fields are shown to tune the effective hybridization and exchange interactions potentially leading to new exotic field tuned effects in f-based materials.
Highlights
Anisotropy is a key parameter defining the nature and dimensionality of correlated electron materials
The cubic system CeIn3 exhibits a phenotypical phase diagram of a heavy fermion superconductor: it orders antiferromagnetically (AFM) at ambient pressure (TN ≈ 10 K), which can be suppressed by moderate pressures around 25 kbar accompanied by a small dome of superconductivity (Tcmax ≈ 200 mK) around the quantum critical point associated with the destruction of the Néel order at zero temperature
This is typical for heavy fermion superconductors thought to be mediated by quantum critical spin fluctuations
Summary
Anisotropy is a key parameter defining the nature and dimensionality of correlated electron materials. The cubic system CeIn3 exhibits a phenotypical phase diagram of a heavy fermion superconductor: it orders antiferromagnetically (AFM) at ambient pressure (TN ≈ 10 K), which can be suppressed by moderate pressures around 25 kbar accompanied by a small dome of superconductivity (Tcmax ≈ 200 mK) around the quantum critical point associated with the destruction of the Néel order at zero temperature.. The cubic system CeIn3 exhibits a phenotypical phase diagram of a heavy fermion superconductor: it orders antiferromagnetically (AFM) at ambient pressure (TN ≈ 10 K), which can be suppressed by moderate pressures around 25 kbar accompanied by a small dome of superconductivity (Tcmax ≈ 200 mK) around the quantum critical point associated with the destruction of the Néel order at zero temperature.4 This is typical for heavy fermion superconductors thought to be mediated by quantum critical spin fluctuations.. The cubic system CeIn3 exhibits a phenotypical phase diagram of a heavy fermion superconductor: it orders antiferromagnetically (AFM) at ambient pressure (TN ≈ 10 K), which can be suppressed by moderate pressures around 25 kbar accompanied by a small dome of superconductivity (Tcmax ≈ 200 mK) around the quantum critical point associated with the destruction of the Néel order at zero temperature. This is typical for heavy fermion superconductors thought to be mediated by quantum critical spin fluctuations. At the same time, the material at ambient pressure shows an enigmatic quantum critical transition at a field around 40 T, accompanied by a divergence of the electronic effective mass observed by quantum oscillation experiments. Here we show the sudden emergence of magnetic anisotropy at a similar field scale
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