Excess heat capacity in magnetically ordered Ce heavy fermion metals
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arXiv
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| Auteurs principaux: | , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866913536224002048 |
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| author | Scheie, A. Liu, Yu Ghioldi, E. A. Fender, S. Rosa, P. F. S. Bauer, E. D. Zhu, Jian-Xin Ronning, F. |
| author_facet | Scheie, A. Liu, Yu Ghioldi, E. A. Fender, S. Rosa, P. F. S. Bauer, E. D. Zhu, Jian-Xin Ronning, F. |
| contents | We study the magnetic heat capacity of a series of magnetically ordered Ce-based heavy fermion materials, which show an anomalous $T^3$ heat capacity in excess of the phonon contribution in many materials. For compounds for which magnon models have been worked out, we show that the local-moment magnon heat capacity derived from the measured magnon spectra underestimates the experimental specific heat. The excess heat capacity reveals increasing density of states with increasing energy, akin to a pseudogap. We show that this anomalous temperature-dependent term is not associated with proximity to a quantum critical point (QCP), but is strongly correlated with $T_N$, indicating the anomalous excitations are governed by the magnetic exchange interaction. This insight may hold key information for understanding magnetically ordered heavy fermions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_10718 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Excess heat capacity in magnetically ordered Ce heavy fermion metals Scheie, A. Liu, Yu Ghioldi, E. A. Fender, S. Rosa, P. F. S. Bauer, E. D. Zhu, Jian-Xin Ronning, F. Strongly Correlated Electrons We study the magnetic heat capacity of a series of magnetically ordered Ce-based heavy fermion materials, which show an anomalous $T^3$ heat capacity in excess of the phonon contribution in many materials. For compounds for which magnon models have been worked out, we show that the local-moment magnon heat capacity derived from the measured magnon spectra underestimates the experimental specific heat. The excess heat capacity reveals increasing density of states with increasing energy, akin to a pseudogap. We show that this anomalous temperature-dependent term is not associated with proximity to a quantum critical point (QCP), but is strongly correlated with $T_N$, indicating the anomalous excitations are governed by the magnetic exchange interaction. This insight may hold key information for understanding magnetically ordered heavy fermions. |
| title | Excess heat capacity in magnetically ordered Ce heavy fermion metals |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2401.10718 |