Specific Heat of the Dilute Ising Magnet LiHo$_x$Y$_{1-x}$F$_4$

Details Specific Heat of the Dilute Ising Magnet LiHo$_x$Y$_{1-x}$F$_4$ Specific Heat of the Dilute Ising Magnet LiHo$_x$Y$_{1-x}$F$_4$

2006-12-17

arxiv.org/abs/cond-mat/0612434v1

Phys. Rev. Lett. 98, 037203 (2007)

Physics

Condensed Matter

Disordered Systems and Neural Networks

10 pages, 3 figurs, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.98.037203

We present specific heat data on three samples of the dilute Ising magnet $\HoYLF$ with $x = 0.018$, 0.045 and 0.080. Previous measurements of the ac susceptibility of an $x = 0.045$ sample showed the Ho$^{3+}$ moments to remain dynamic down to very low temperatures and the specific heat was found to have unusually sharp features. In contrast, our measurements do not exhibit these sharp features in the specific heat and instead show a broad feature, for all three samples studied, which is qualitatively consistent with a spin glass state. Integrating $C/T$, however, reveals an increase in residual entropy with lower Ho concentration, consistent with recent Monte Carlo simulations showing a lack of spin glass transition for low x.

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