2015/01/14 by L. A. Prozorova, Prozorova, L. A., S. S. Sosin +17
Engineering · Physics and Astronomy · #FOS: Physical sciences #Magneto-Optical Properties and Applications #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.1501.03226
4 pages, 4 figures
arxiv created 2015/01/14 · openalex publication_date 2015/01/14 · arxiv updated 2015/01/15 · openalex created_date 2016/09/16 · openalex updated_date 2026/07/28
We report on a heat capacity study of high quality single crystal samples of \lcvo -- a frustrated spin S=1/2 chain system -- in magnetic field amounting to 3/4 of the saturation field. At low fields up to about 7~T, a linear temperature dependence of the specific heat, Cp∝ T, resulting from 1D magnetic correlations in the spin chains is followed upon cooling by a sharp lambda anomaly of the transition into a 3D helical phase with Cp∝ T3 behavior at low temperature. The transition from a spin liquid into a spin-modulated (SM) phase at higher fields occurs via a hump-like anomaly which, as the temperature decreases further turns into a Cp∝ T2 law distinctive for a quasi-2D system. We suggest an explanation for how nonmagnetic defects in the Cu2+ chains can suppress 3D long-range ordering in the SM phase and leave it undisturbed in a helical phase.