Magnetic Phase Diagram of Solid Solutions in the CoCr2S4–Cu0.5Ga0.5Cr2S4 System

Аминов, Т. Г.; Busheva, E. V.; Шабунина, Г. Г.; Новоторцев, В. М.

doi:10.1134/s0036023618040022

Cited by 9 publications

(2 citation statements)

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“…On further cooling, an abrupt M/H drop and a sharp C/T peak are observed at T N = 31 K, indicating the onset of a magnetic LRO. The transition temperature is consistent with the previously reported values [20,36,37].…”

Section: Basic Physical Properties a Structural Analysissupporting

confidence: 93%

“…Previously, CuGaCr 4 S 8 was synthesized in Refs. [20,36,37] but no conclusive remark on the A-site ordering was given because the close proximity of the scattering factors between Cu + and Ga 3+ made it challenging to judge the presence or absence of forbidden reflections for the A-site disordered case at the instrumental resolution of the time. The present synchrotron x-ray diffraction (XRD) measurement provides for the first time a direct proof of the perfect crystallographic ordering of Cu and Ga atoms at the A site, confirming the formation of a breathing pyrochlore Cr network.…”

Section: Introductionmentioning

confidence: 99%

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Breathing pyrochlore magnet CuGaCr$_{4}$S$_{8}$: Magnetic, thermodynamic, and dielectric properties

Gen¹,

Ishikawa²,

Miyake³

et al. 2023

Preprint

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We investigate the crystallographic and magnetic properties of a chromium-based thiospinel CuGaCr 4 S 8 . From a synchrotron x-ray diffraction experiment and structural refinement, Cu and Ga atoms are found to occupy the tetrahedral A-sites in an alternate way, yielding breathing pyrochlore Cr network. CuGaCr 4 S 8 undergoes a magnetic transition associated with a structural distortion at 31 K in zero magnetic field, indicating that the spin-lattice coupling is responsible for relieving the geometrical frustration. When applying a pulsed high magnetic field, a sharp metamagnetic transition takes place at 40 T, followed by a 1/2-magnetization plateau up to 103 T. These phase transitions accompany dielectric anomalies, suggesting the presence of helical spin correlations in low-field phases. The density-functional-theory calculation reveals that CuGaCr 4 S 8 is dominated by antiferromagnetic and ferromagnetic exchange couplings within small and large tetrahedra, respectively, in analogy with CuInCr 4 S 8 . We argue that A-site-ordered Cr thiospinels serve as an excellent platform to explore diverse magnetic phases along with pronounced magnetoelastic and magnetodielectric responses.

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Section: Basic Physical Properties a Structural Analysissupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%