Electron spin resonance in the $S$=1/2 quasi-one-dimensional antiferromagnet with Dzyaloshinskii-Moriya interaction BaCu$\_2$Ge$\_2$O$\_7$

Abstract

We have investigated the electron spin resonance (ESR) on single crystals of BaCu$\_2$Ge$\_2$O$\_7$ at temperatures between 300 and 2 K and in a large frequency band, 9.6 -134 GHz, in order to test the predictions of a recent theory, proposed by Oshikawa and Affleck (OA), which describes the ESR in a $S$=1/2 Heisenberg chain with the Dzyaloshinskii-Moriya interaction. We find, in particular, that the ESR linewidth, $\Delta H$, displays a rich temperature behavior. As the temperature decreases from $T\_max/2\approx$ 170 K to 50 K, $\Delta H$ shows a rapid and linear decrease, $\Delta H\sim T$. At low temperatures, below 50 K, $\Delta H$ acquires a strong dependence on the magnetic field orientation and for $H\Vert c$ it shows a $(h/T{)}^2$ behavior which is due to an induced staggered field $h$, according to OA's prediction.

References in corpus (10)

• Theory of the field-induced gap in $S=1/2$ antiferromagnetic chains
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• Electron Spin Resonance in S=1/2 antiferromagnetic chains
• Theory of Low Temperature Electron Spin Resonance in Half-integer Spin Antiferromagnetic Chains
• ESR investigation on the Breather mode and the Spinon-Breather dynamical crossover in Cu Benzoate
• Quasi-1D spin-1/2 Heisenberg magnets in their ordered phase: correlation functions
• Dynamical Magnetic Susceptibilities in Cu Benzoate
• Weak ferromagnetism of quasi-one-dimensional S=1/2 antiferromagnet BaCu${}_2$Ge${}_2$O${}_7$
• Calculation of Neel temperature for S=1/2 quasi-one-dimensional Heisenberg antiferromagnets

Cited by in corpus (9)

• Dynamic probes of quantum spin chains with the Dzyaloshinskii-Moriya interaction
• Electron Spin Resonance in sine-Gordon spin chains in the perturbative spinon regime
• Site-selective quantum correlations revealed by magnetic anisotropy in the tetramer system SeCuO3
• Spin dynamics in S = 1/2 antiferromagnetic chain compounds delta-(EDT-TTF-CONMe_2)_2X (X=AsF_6, Br): a multi-frequency Electron Spin Resonance study
• Dimensional crossover of spin chains in a transverse staggered field: an NMR study
• Magnetic phase diagram of a spin-1/2 XXZ chain with modulated Dzyaloshinskii-Moriya interaction
• Breathers and Raman scattering in a two-leg ladder with staggered Dzialoshinskii-Moriya interaction
• Exchange integrals and magnetization distribution in BaCu2X2O7 (X=Ge,Si)
• Entanglement and its evolution after a quench in the presence of an energy current