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Magnetic properties of a quantum spin ladder in proximity to the isotropic limit

Published inPhysical review. B., vol. 103, 205131
Publication date2021-05-18
First online date2021-05-18
Abstract

We report on the synthesis, crystal structure, magnetic, thermodynamic, and electron-spin-resonance prop- erties of the coordination complex [Cu2(pz)3(4-HOpy)4](ClO4)4 (pz=pyrazine; 4-HOpy=4-hydroxypyridine). Thismaterialisidentifiedasaspin-1/2Heisenbergladdersystemwithexchange-couplingparametersJrung/kB = 12.1(1) K and Jleg/kB = 10.5(3) K [Jrung/Jleg = 1.15(4)]. For single crystals our measurements revealed two critical fields, μ0Hc1 = 4.63(5) T and μ0Hc2 = 22.78(5) T (for H ∥ a∗), separating the gapped spin-liquid, gapless Tomonaga-Luttinger-liquid, and fully spin-polarized phase. No signature of a field-induced transition into a magnetically ordered phase was found at temperatures down to 450 mK. The material bridges an important gap by providing an excellent physical realization of an almost isotropic spin-1/2 strong-rung Heisenberg ladder system with modest exchange-coupling energy and critical-field scales.

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ZVYAGIN, S. A. et al. Magnetic properties of a quantum spin ladder in proximity to the isotropic limit. In: Physical review. B., 2021, vol. 103, p. 205131. doi: 10.1103/PhysRevB.103.205131
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ISSN of the journal2469-9950
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