ESR study of the spin ladder with uniform Dzyaloshinskii-Moria interaction

Abstract

Evolution of the ESR absorption in a strong-leg spin ladder magnet (C${}_7$H${}_{10}$N${}_2$)${}_2$CuBr${}_4$ (abbreviated as DIMPY) is studied from 300K to 400mK. Temperature dependence of the ESR relaxation follows a staircase of crossovers between different relaxation regimes. We ague that the main mechanism of ESR line broadening in DIMPY is uniform Dzyaloshinskii-Moria interaction ($|\vec{D}|=0.20$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 results in the lifting of the triplet excitation degeneracy, revealed through the weak splitting of the ESR absorption at low temperatures.

13 pages, submitted to PRB, Fig.3 updated

References in corpus (5)

• Spontaneous Magnon Decays
• Field-induced Tomonaga-Luttinger liquid phase of a two-leg spin-1/2 ladder with strong leg interactions
• Spin-resonance modes of the spin-gap magnet TlCuCl_3
• Dynamical Dzyaloshinsky-Moriya Interaction in KCuF3
• High-field magnetic resonance of spinons and magnons in a triangular lattice S=1/2 antiferromagnet Cs2CuCl4

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