Zero-point entropies of spin-jam and spin-glass states in a frustrated magnet

Abstract

Thermodynamics studies of a prototypical quasi-two-dimensional frustrated magnet Ba${}_2$Sn${}_2$ZnCr${}_{7p}$Ga${}_{10-7p}$O${}_{22}$ where the magnetic Cr${}^{3+}$ ions are arranged in a triangular network of bipyramids show that the magnetic zero-point entropy for $p=0.98$ is 55(1)\% of the entropy expected when the Cr${}^{3+}$ moments are fully disordered. Furthermore, when combined with a previous neutron scattering study and the perimeter scaling entropy of a spin jam, the analysis reveals that with decreasing $p$, i.e., doping of the nonmagnetic Ga${}^{3+}$ ions, the variation in the magnetic zero-point entropy can be well explained by the combined effects of the zero-point entropy of the spin jam state and that of weakly coupled orphan spins, shedding light on the coexistence of the two types of spin states in quantum magnetism.

arXiv comment8 pages, 4 figures, and Supplemental Material

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Cited by in corpus (1)

• The nature of low-temperature spin-freezing in frustrated Kitaev magnets