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Specific heat C_{p}(T) measurements of the heavy fermion normal-spinelstructure compound LiV_{2}O_{4} were carried out using a heat-pulse calorimeterover the temperature T range from 1.2 to 108 K. The electronic specific heatC_{e}(T) of LiV_{2}O_{4} is extracted from the C_{p}(T) data using the latticecontribution obtained for LiTi_{2}O_{4}, a superconductor with T_{c} = 11.8 K.The electronic specific heat coefficient \gamma(T) = C_{e}(T)/T of LiV_{2}O_{4}is found to be 0.42 and 0.43 J/mol K^2 at T = 1 K for two different highmagnetic purity samples, respectively. \gamma(T) decreases rapidly withincreasing temperature from 4 to 30 K and then decreases much more slowly from0.13 J/mol K^2 at 30 K to 0.08 J/mol K^2 at 108 K. The C_{e}(T) is comparedwith theoretical predictions for the spin S = 1/2 Kondo model, a generic Fermiliquid model, and an antiferromagnetically coupled quantum-disordered metal.Each of these theories can adequately describe C_{e}(T) in the Fermi liquidregime at low (~ 1 to 10 K) temperatures, consistently yielding a largeextrapolated \gamma(0) = 428(3) mJ/mol K^2. However, none of these theoriesdescribes C_{e}(T) from ~ 10 K to 108 K. Our C_{e}(T) data are also in severedisagreement with the magnetic specific heat of the spin S = 1/2 Heisenbergmodel. Thermal expansion measurements of LiV_{2}O_{4} were carried out from 4.4to 297 K using a differential capacitance dilatometer. Strong increases in thethermal expansion coefficient and Gr\"uneisen parameter \Gamma are found below\~ 20 K, confirming the results of Chmaissem et al. [Phys. Rev. Lett. 79, 4866(1997)] obtained using neutron diffraction. We estimate that \Gamma(0) is about11.4.Comment: 17 typeset RevTeX pages, 15 eps figures included, uses epsf; to be  published in Phys. Rev.

physical review. b, condensed matter

Specific heat (1.2–108 K) and thermal expansion (4.4–297 K) measurements of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>3</mml:mn><mml:mi>d</mml:mi></mml:math>heavy-fermion compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">LiV</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O…

Specific heat (1.2–108 K) and thermal expansion (4.4–297 K) measurements of the3dheavy-fermion compoundLiV2O…