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

• Published in: arXiv.org
• Main Authors: Teknowijoyo, S, Cho, K, Timmons, E I, Tanatar, M A, Krizan, J W, Cava, R J, Prozorov, R
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 25.05.2021
• Subjects: Configurations; Frequency measurement; Low temperature; Magnetic fields; Magnetic permeability; Magnetism; Spin dynamics
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2105.12218

Radio-frequency (14.6 MHz) AC magnetic susceptibility, \(\chi^{\prime}_{AC}\), 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 \(\chi^{\prime}_{AC}(T)\) 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 \(\chi^{\prime}_{AC}\) 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.