Structural and magnetic properties ofCuSb2O6probed by ESR

Abstract

A detailed electron-spin-resonance ͑ESR͒ investigation is performed in the one-dimensional magnet CuSb 2 O 6 on both single crystals and polycrystals. Angular-dependent ESR data on the single crystal are interpreted in terms of the anisotropic Zeeman interaction due to the Jahn-Teller distortion of the two inequivalent CuO 6 octahedra. The very strong increase of the ESR linewidth with increasing temperature on approaching the monoclinic-to-tetragonal phase transition at about 400 K indicates the thermal activation of a dynamic Jahn-Teller process. Utilizing temperature-dependent x-ray diffraction experiments we propose the monoclinic angle ␤ as the order parameter of this phase transition.

Torque magnetometry study of magnetically ordered state and spin reorientation in the quasi-one-dimensionalS=12Heisenberg antiferromagnetCuSb2O6Herak1, Žilić2, Čalogović3 et al. 2015Phys. Rev. B9040View full textAdd to dashboardCite

“…The orientation of (7) • , in good agreement with previously published data [1]. Presence of multiple twins, reported by other authors [2][3][4][12][13][14], was also observed in our data.…”

“…III A. Previous detailed ESR analysis of CuSb 2 O 6 has shown that there are four possible twin domains in the monoclinic β phase which appear simultaneously during the structural phase transition [2,4].…”

“…Firstly, polycrystalline CuSb 2 O 6 powder was synthesized by solid state reaction described in detail elsewhere [3]. Secondly, CuSb 2 O 6 powders and HCl or TeCl 4 were mixed and sealed in a 24 mm diameter and 20 cm long evacuated quartz tube. The tube was inserted in a two-zone horizontal tube furnace with a source-zone temperature of 900 • C and a growth-zone temperature of 800…”

“…Large decrease of susceptibility characteristically observed when magnetic field is applied along the easy axis has been reported for b axis direction [4,11], a axis direction [3], and even for both directions [9,12,13]. Recent report on single crystal measurements of magnetic susceptibility showed that significant decrease of susceptibility below T N and spin flop transition at H SF = 1.25 T is observed when magnetic field is applied along both the a and b axis, suggesting that both a and b are the easy axes in CuSb 2 O 6 [12].…”

“…The phase transition from tetragonal to monoclinic phase is accompanied by a formation of crystallographic twins which is a result of two different choices for elongation of two crystallographically equivalent CuO 6 octahedra in the unit cell of CuSb 2 O 6 [3,4].…”