Low-temperature high-frequency dynamic magnetic susceptibility of classical spin-ice Dy2Ti2O7. (30th August 2021)

• Record Type: Journal Article
• Authors: Teknowijoyo, S; Cho, K; Timmons, E I; Tanatar, M A; Krizan, J W; Cava, R J; Prozorov, R
• Is Part Of: Journal of physics. Volume 33:Number 45(2021)
• Publication Date: 2021-08-30
• Subjects: susceptibility -- spin ice -- frequency domain; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/ac1cb0
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: Radio-frequency (14.6 MHz) AC magnetic susceptibility, χ A C ′, of Dy2 Ti2 O7 was measured using self-oscillating tunnel-diode resonator. Measurements were made with the excitation AC field parallel to the superimposed DC magnetic field up to 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 ≈ 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 features are frequency independent. An unusual upturn of the magnetic susceptibility at T → 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.