Excess heat capacity in magnetically ordered Ce heavy-fermion metals
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, 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.
Authors
- E. A. Ghioldi
- Eric D. Bauer (ORCID: https://orcid.org/0000-0003-0017-1937)
- Yu Liu (ORCID: https://orcid.org/0000-0001-8886-2876)
- Allen O. Scheie (ORCID: https://orcid.org/0000-0002-7450-5138)
- Shannon S. Fender (ORCID: https://orcid.org/0000-0002-9895-5539)
- F. Ronning (ORCID: https://orcid.org/0000-0002-2679-7957)
- P. F. S. Rosa (ORCID: https://orcid.org/0000-0002-3437-548X)
- Jian‐Xin Zhu (ORCID: https://orcid.org/0000-0001-7991-3918)
Institutions
- Los Alamos National Laboratory (US)
- Center for Integrated Nanotechnologies (US)
- University of Tennessee at Knoxville (US)
Publication Details
- Journal
- Physical review. B./Physical review. B
- Published
- 2024-08-09
- DOI
- https://doi.org/10.1103/physrevb.110.085123
- Primary Topic
- Rare-earth and actinide compounds
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- U.S. Department of Energy
- National Nuclear Security Administration
- Basic Energy Sciences
- Laboratory Directed Research and Development
- Los Alamos National Laboratory
- Division of Materials Sciences and Engineering