Raman signatures of novel electronic states in BCT lattice

Abstract : We propose an effective model to describe the Raman scattering experiments in crystalline materials with body-centered tetragonal (BCT) lattice. Our model takes into account different emerging spin liquid states. The states display the breaking of lattice translation symmetry from a body-centered tetragonal (BCT) to simple tetragonal (ST). The breaking of lattice translation symmetry results in a folding of the Brillouin zone, which translates itself into either a gap or a pseudogap. This (pseudo) gap can be observed in the Raman spectra for each of the irreducible symmetries that we investigate. We introduce an alternative approach to the effective mass approximation to treat the A$_{2g}$ symmetry based on resonant process. The results for the A$_{2g}$ symmetry show that there is a Raman response associated with a particular spin liquid phase which also produces a gap if we include modulation effects linked to a specific local staggered order. We also discuss the relevance of this result for the problem of hidden order in URu$_{2}$Si$_{2}$ and to the A$_{2g}$ results referred by recent experiments. Complementing these analysis, we use the standard effective mass approximation to analyze the responses associated with each state for the A$_{1g}$, B$_{1g}$ and B$_{2g}$ irreducible symmetries.
Type de document :
Pré-publication, Document de travail
2017
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https://hal.archives-ouvertes.fr/hal-01630370
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Dernière modification le : jeudi 11 janvier 2018 - 06:23:22
Document(s) archivé(s) le : jeudi 8 février 2018 - 13:56:25

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• HAL Id : hal-01630370, version 1
• ARXIV : 1710.08942

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Carlene Silva de Farias, Sebastien Burdin, Alvaro Ferraz. Raman signatures of novel electronic states in BCT lattice. 2017. 〈hal-01630370〉

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