Low-temperature high-frequency dynamic magnetic susceptibility of classical spin-ice Dy$_2$Ti$_2$O$_7$

S. Teknowijoyo; K. Cho; E. I. Timmons; M. A. Tanatar; J. W. Krizan; R. J. Cava; R. Prozorov

doi:10.1088/1361-648X/ac1cb0

paper

Low-temperature high-frequency dynamic magnetic susceptibility of classical spin-ice Dy $_{2}$ Ti $_{2}$ O $_{7}$

arXiv:2105.12218 · doi:10.1088/1361-648X/ac1cb0

Abstract

Radio-frequency (14.6 MHz) AC magnetic susceptibility, $χ_{A C}^{'}$ , of \dytio\ was measured using a self-oscillating tunnel-diode resonator. Measurements were made with the excitation AC field parallel to the superimposed DC magnetic field up 5 T in a wide temperature range from 50 mK to 100 K. At 14.6 MHz a known broad peak of $χ_{A C}^{'} (T)$ from kHz - range audio-frequency measurements around 15~K for both [111] and [110] directions shifts to 45~K, continuing the Arrhenius activated behavior with the same activation energy barrier of $E_{a} \approx 230$ ~K. Magnetic field dependence of $χ_{A C}^{'}$ along [111] reproduces previously reported low-temperature two-in-two-out to three-in-one-out spin configuration transition at about 1~T, and an intermediate phase between 1 and 1.5~T. The boundaries of the intermediate phase show reasonable overlap with the literature data and connect at a critical endpoint of the first-order transition line, suggesting that these low-temperature features are frequency independent. An unusual upturn of magnetic susceptibility at $T \to 0$ was observed in magnetic fields between 1.5~T and 2~T for both magnetic field directions, before fully polarized configuration sets in above 2~T.

Low-temperature high-frequency dynamic magnetic susceptibility of classical spin-ice Dy2​Ti2​O7​

Abstract

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Low-temperature high-frequency dynamic magnetic susceptibility of classical spin-ice Dy $_{2}$ Ti $_{2}$ O $_{7}$