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

Zvyagin, S.; Ponomaryov, O.; Ozerov, M.; Schulze, E.; Scurschii, I.; Beyer, R.; Reimann, T.; Zviagina, L.; Green, E. L.; Wosnitza, J.; Sheikin, I.; Bouillot, P.; Giamarchi, T.; Wikara, J. L.; Turnbull, M. M.; Landee, C. P.

We report on the synthesis, crystal structure, magnetic, thermodynamic, and electron-spin-resonance properties of the coordination complex [Cu2(pz)3(4-HOpy)4](ClO)4 (pz = pyrazine; 4-HOpy = 4-hydroxypyridine). This material is identified as a spin-1/2 Heisenberg ladder system with exchange-coupling parameters Jrung/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 II 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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Permalink: https://www.hzdr.de/publications/Publ-32694
Publ.-Id: 32694