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| HAL: hal-00122070, version 1 |
| arXiv: cond-mat/0206236 |
| Detailed view |  Export this paper |
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| European Physical Journal B 29 (2002) 385-398 |
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| Dynamics of modulated and composite aperiodic crystals: the signature of the inner polarization in the neutron coherent inelastic scattering |
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| Ovidiu Radulescu 1T. Janssen |
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| (2002) |
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| We compare within an unifying formalism the dynamical properties of modulated and composite aperiodic (incommensurate) crystals. We discuss the concept of inner polarization and we define an inner polarization parameter beta that distinguishes between different acoustic modes of aperiodic crystals. Although this concept has its limitations, we show that it can be used to extract valuable information from neutron coherent inelastic scattering experiments. Within certain conditions, the ratio between the dynamic and the static structure factors at various Bragg peaks depends on beta. We show how the knowledge of beta for modes of an unknown structure can be used to decide whether the structure is composite or modulated. Furthermore, the same information can be used to predict scattered intensity within unexplored regions of the reciprocal space, being thus a guide for experiments |
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| 1: | Institut de Recherche Mathématique de Rennes (IRMAR) |
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CNRS : UMR6625 – Université de Rennes 1 – École normale supérieure de Cachan - ENS Cachan – Institut National des Sciences Appliquées (INSA) : - RENNES – Université de Rennes II - Haute Bretagne |
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| 2: | Groupe matière condensée et matériaux (GMCM) |
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CNRS : UMR6626 – Université de Rennes 1 |
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| 3: | Laboratoire Léon Brillouin (LLB) |
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CNRS : UMR12 – CEA : DSM/IRAMIS |
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| Subject | : | Physics/Condensed Matter/Materials Science |
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| Fulltext link: |
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| http://fr.arXiv.org/abs/cond-mat/0206236 |
| hal-00122070, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00122070 | |
| oai:hal.archives-ouvertes.fr:hal-00122070 | |
| From: Import Arxiv | |
| Submitted on: Tuesday, 26 December 2006 09:51:52 | |
| Updated on: Wednesday, 24 March 2010 09:44:08 | |
