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

V.N. Glazkov ; M. Fayzullin ; Y. Krasnikova ; Grigory Skoblin (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; D. Schmidiger ; S. Mühlbauer ; A. Zheludev
Physical Review B - Condensed Matter and Materials Physics (1098-0121). Vol. 92 (2015), 18,
[Artikel, refereegranskad vetenskaplig]

©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.

Denna post skapades 2016-05-11.
CPL Pubid: 236233


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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik



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