Excess heat capacity in magnetically ordered Ce heavy fermion metals
| Autor: | Scheie, A., Liu, Yu, Ghioldi, E. A., Fender, S., Rosa, P. F. S., Bauer, E. D., Zhu, Jian-Xin, Ronning, F. |
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| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 110, 085123 (2024) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.110.085123 |
| Popis: | 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. Comment: 5 pages, 4 figures |
| Databáze: | arXiv |
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