Electronic specific heat coefficient and magnetic properties of Y(Fe${}_{1-x}$Co${}_x$)${}_2$ Laves phases: a combined experimental and first-principles study

Abstract

We investigated experimentally and computationally the concentration dependence of electronic specific heat coefficient $\gamma$ in Y(Fe${}_{1-x}$Co${}_x$)${}_2$ pseudobinary Laves phase system. The experimentally observed maximum in $\gamma$($x$) around the magnetic phase transition was interpreted within the local density approximation (LDA) combined with the virtual crystal approximation (VCA). To explain the formation of the observed maximum, we analyzed theoretically the dependence of the magnetic energy, magnetic moments, densities of states, and Fermi surfaces on the Co concentration. Furthermore, we carried out the calculations of density of states at the Fermi level as a function of fixed spin moment. The calculated Co concentration at which $\gamma$ takes the maximum value ($x_{\max -\mathrm{LDA}-\mathrm{VCA}}=0.91$) stays in good agreement with the measured value ($x_{\max -\mathrm{expt}}=0.925$). We conclude that the observed maximum in $\gamma (x)$ results from the presence of the sharp DOS peak in the vicinity of the Fermi level.

References in corpus (6)

• Normal and inverse magnetocaloric effects in structurally disordered Laves phase Y${}_{1-x}$Gd${}_x$Co${}_2$ (0 $\le$ x $\le$ 1) compounds
• Magnetocrystalline anisotropy of Fe5PB2 and its alloys with Co and 5d elements: a combined first-principles and experimental study
• Induced magnetic ordering in alloyed compounds based on Pauli paramagnet YCo${}_2$
• Curie temperature study of the Y(Fe${}_{1-x}$Co${}_x$)${}_2$ and Zr(Fe${}_{1-x}$Co${}_x$)${}_2$ systems using mean-field theory and Monte Carlo method
• Influence of structural disorder on magnetic properties and electronic structure of YCo${}_2$
• Collapse of the magnetic moment under pressure of AFe${}_2$ (A = Y, Zr, Lu and Hf) in the cubic Laves phase

Cited by in corpus (1)

• Monte Carlo calculations of Curie temperatures of Y${}_{1-x}$Gd${}_x$(Fe${}_{1-y}$Co${}_y$)${}_2$ pseudobinary system