| HAL : hal-00003942, version 2 |
| arXiv : cond-mat/0501485 |
| DOI : 10.1103/PhysRevLett.92.057203 |
| Fiche détaillée | Récupérer au format |
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| Physical Review Letters 92 (2004) 057203 |
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| Versions disponibles : | v1 (20-01-2005) | v2 (20-01-2005) |
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| Electron spin resonance in the $S$=1/2 quasi-one-dimensional antiferromagnet with Dzyaloshinskii-Moriya interaction BaCu$_2$Ge$_2$O$_7$ |
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| Sylvain Bertaina 1V. A. Pashchenko 2 |
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| (2004) |
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| 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 $H \| c$ it shows a $(h/T)^2$ behavior which is due to an induced staggered field $h$, according to OA's prediction. |
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| 1 : | Laboratoire matériaux et microélectronique de Provence (L2MP) |
| CNRS : UMR6137 – Université Paul Cézanne - Aix-Marseille III – Université de Provence - Aix-Marseille I – Université Sud Toulon Var | |
| 2 : | Physikalisches Institut |
| Johann Wolfgang Goethe Universität Frankfurt | |
| 3 : | Department of Advanced Materials Science |
| University of Tokyo | |
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| Domaine | : | Physique/Matière Condensée/Electrons fortement corrélés |
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| EPR theory – low-dimensional – magnetic – spin dynamic – dzyaloshinskii:moriya – chain – heisenberg |
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| Liste des fichiers attachés à ce document : | ||||||||||
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| hal-00003942, version 2 | |
| http://hal.archives-ouvertes.fr/hal-00003942 | |
| oai:hal.archives-ouvertes.fr:hal-00003942 | |
| Contributeur : Sylvain Bertaina | |
| Soumis le : Jeudi 20 Janvier 2005, 10:34:33 | |
| Dernière modification le : Jeudi 20 Janvier 2005, 10:35:52 | |