Logarithmic Fermi-Liquid Breakdown in NbFe2
Résumé
The d-electron low temperature magnet NbFe2 is poised near the threshold of magnetism at ambient pressure, and can be tuned across the associated quantum critical point by adjusting the precise stoichiometry within the Nb1 yFe2 y homogeneity range. In a nearly critical single crystal (y = - 0.01), we observe a T$^{3/2} power-law dependence of the resistivity on temperature T and a logarithmic temperature dependence of the Sommerfeld coefficient $\gamma = C/T$ of the specific heat capacity C over nearly 2 orders of magnitude in temperature, extending down to 0.1 K.
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