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Low-temperature magnetic and transport properties of single-crystal CeCoGe
M Elmassalami1, R E Rapp, J P Sinnecker
1Instituto de Fisica, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21945-970 Rio de Janeiro, Brazil.
Abstract:
The low-temperature properties of single-crystal CeCoGe were investigated by specific heat C(T,H), magnetoresistivity ρ(T,H), and differential susceptibility measurements χ(T,H). The zero-field low-temperature specific heat evolves as C = γT+βT(3) = 42T+23.5T(3) mJ mol(-1) K(-1). On comparing its γ = 42 mJ mol(-1) K(-1) with that of LaCoGe (12 mJ mol(-1) K(-2)) it is inferred that both 3d (Co) and 4f (Ce) orbitals contribute to the density of states at the Fermi level. Assuming that its phonic contribution to the specific heat is similar to LaCoGe (β = 0.5 mJ mol(-1) K(-4)), then the extra cubic term in the specific heat (23T(3) mJ mol(-1) K(-1)) must be due to magnon excitation within the antiferromagnetically ordered state, T
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