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

Abstract

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.

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

References in corpus (6)

• Entangled Quantum States of Magnetic Dipoles
• Tunable Quantum Tunneling of Magnetic Domain Walls
• Coherent Spin Oscillations in a Disordered Magnet
• Theory of the Magnetic phase diagram of LiHoF${}_4$
• Significance of the Hyperfine Interactions in the Phase Diagram of $\mathrm{LiH}{\mathrm{o}}_{\mathrm{x}}{\mathrm{Y}}_{1-\mathrm{x}}{\mathrm{F}}_4$
• Absence of Dipole Glass Transition for Randomly Dilute Classical Ising Dipoles

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