On the specific heat of heavy-fermion systems using the periodic Anderson modelN. 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 , , FeSi, CeRhSb and HF metals such as , and 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