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arXiv · 1507.02503

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

V. N. Glazkov·M. Fayzullin·Y. Krasnikova·G. Skoblin·D. Schmidiger·S. Mühlbauer·A. Zheludev
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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.

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V. N. Glazkov, M. Fayzullin, Y. Krasnikova, G. Skoblin, D. Schmidiger, S. Mühlbauer, A. Zheludev. 2015-07-10. ESR study of the spin ladder with uniform Dzyaloshinskii-Moria interaction. https://doi.org/10.1103/physrevb.92.184403

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