ESR study of the spin ladder with uniform Dzyaloshinskii-Moriya interaction
Journal article, 2015
©2015 American Physical Society. Evolution of the ESR absorption in a strong-leg spin ladder magnet (C7H10N)2CuBr4 (abbreviated as DIMPY) is studied from 300 K to 400 mK. Temperature dependence of the ESR relaxation follows a staircase of crossovers between different relaxation regimes. We argue that the main mechanism of ESR line broadening in DIMPY is uniform Dzyaloshinskii-Moriya interaction (|D|=0.31 K) with an effective longitudinal component along an exchange bond of Cu ions within the legs resulting from the low crystal symmetry of DIMPY and nontrivial orbital ordering. The same Dzyaloshinskii-Moriya interaction along with other weaker anisotropic spin-spin interactions results in the lifting of the triplet excitation degeneracy, revealed through the weak splitting of the ESR absorption at low temperatures.
Author
V.N. Glazkov
Moscow Institute of Physics and Technology
Kapitza Institute for Physical Problems, Russian Academy of Sciences
M. Fayzullin
Kazan Federal University
Y. Krasnikova
Moscow Institute of Physics and Technology
Kapitza Institute for Physical Problems, Russian Academy of Sciences
Grigory Skoblin
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
D. Schmidiger
ETH Zurich
S. Mühlbauer
ETH Zurich
Heinz Maier-Leibnitz Zentrum (MLZ)
A. Zheludev
ETH Zurich
Physical Review B - Condensed Matter and Materials Physics
1098-0121 (ISSN)
Vol. 92 18 184403Subject Categories (SSIF 2011)
Materials Engineering
DOI
10.1103/PhysRevB.92.184403