Volume 77, Number 3, February 2007
Article Number 36001
Number of page(s) 5
Section Condensed Matter: Structural, Mechanical and Thermal Properties
Published online 22 January 2007
EPL, 77 (2007) 36001
DOI: 10.1209/0295-5075/77/36001

On the specific heat of heavy-fermion systems using the periodic Anderson model

N. S. Vidhyadhiraja

Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research Jakkur, Bangalore 560064, India

received 17 August 2006; accepted in final form 27 November 2006; published February 2007
published online 22 January 2007

The periodic Anderson model (PAM) represents a paradigm for understanding the physics of heavy-fermion (HF) compounds. In this paper, we study the specific heat of HF systems using the PAM within the framework of dynamical mean-field theory. By examining the systematic variation of specific heat as a function of particle-hole asymmetry and coupling strength, with the natural focus being on strong coupling, it is demonstrated that experimentally measured specific heat of a variety of paramagnetic Kondo insulators such as ${\rm YbB}_{12}$, ${\rm SmB}_{6}$, FeSi, CeRhSb and HF metals such as ${\rm CeFeGe}_{3}$, ${\rm YbAl}_{3}$ and ${\rm CeAl}_{3}$ can be understood semi-quantitatively using the PAM.

65.40.Ba - Heat capacity .
71.27.+a - Strongly correlated electron systems; heavy fermions .
75.20.Hr - Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions .

© Europhysics Letters Association 2007