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Electron Spin Resonance in the Spin-1/2 Quasi-One-Dimensional Antiferromagnet with Dzyaloshinskii-Moriya Interaction BaCu_2Ge_2O_7

机译:Dzyaloshinskii-Moriya相互作用BaCu_2Ge_2O_7的自旋1/2准一维反铁磁体中的电子自旋共振。

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We have investigated the electron spin resonance (ESR) on single crystals of BaCu_2Ge_2O_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) [Phys. Rev. Lett. 82, 5136 (1999)], which describes the ESR in a spin-1/2 Heisenberg chain with the Dzyaloshinskii-Moriya interaction. We find, in particular, that the ESR linewidth, ΔH, displays a rich temperature behavior. As the temperature decreases from T_(max)/2 ≈ 170 to 50 K, ΔH shows a rapid and linear decrease, ΔH ~ T. At low temperatures, below 50 K, ΔH acquires a strong dependence on the magnetic field orientation and for H || c it shows a (h/T)~2 behavior which is due to an induced staggered field h, according to OA's prediction.
机译:为了检验由Oshikawa和Affleck提出的最新理论的预测,我们研究了BaCu_2Ge_2O_7单晶在300至2 K之间的温度以及9.6-134 GHz的大频带中的电子自旋共振(ESR)。 (OA)[物理牧师82,5136(1999)],它描述了自旋1/2海森堡链中具有Dzyaloshinskii-Moriya相互作用的ESR。我们特别发现,ESR线宽ΔH显示出丰富的温度行为。当温度从T_(max)/ 2≈170降低到50 K时,ΔH显示出快速且线性的降低,ΔH〜T。在低温下,低于50 K时,ΔH对磁场方向有很强的依赖性,对于H || c根据OA的预测,它显示了(h / T)〜2行为,这是由于感应的交错场h引起的。

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