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Field-induced local Fermi-liquid states in the underscreened Kondo model for Eu compounds
by Shingo Kuniyoshi, Ryousuke Shiina
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Submission summary
| Authors (as registered SciPost users): | Shingo Kuniyoshi |
| Submission information | |
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| Preprint Link: | scipost_202207_00019v2 (pdf) |
| Date accepted: | 2023-04-25 |
| Date submitted: | 2023-03-01 07:29 |
| Submitted by: | Kuniyoshi, Shingo |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | International Conference on Strongly Correlated Electron Systems (SCES2022) |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Theoretical |
Abstract
We have studied an underscreened Kondo model for the impurity spin S = 7/2 capturing the 4f characteristics of a nearly divalent Eu ion. By using the numerical renormalization group method, it is shown that an unusual heavy-fermion state is induced from the underscreened spin state when a weak crystal field is introduced. It is also found that the application of the magnetic field enhances the effective mass of the heavy fermions, reflecting the field-induced level crossing of the spin states. We will discuss the mechanism of these mass enhancements in terms of a realization of the two-stage Kondo effect.
Published as SciPost Phys. Proc. 11, 015 (2023)