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Raman Spectra of Unconventional Superconductors

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Materials Synthesis and Characterization

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Abstract

The aim of this article is to provide a short survey of recent Raman data collected on new oxides superconductors and organic superconductors. Contributions to this field have increased dramatically in the past years mainly because single crystals and thin films of excellent quality have become available and partly because the experimental spectra were greatly improved by the use of charge-coupled-device detectors. This chapter is restricted to vibrational studies and to variations of phonons with temperature and oxygen doping; our main concern is to show how the Raman lines are affected by these factors. The next section gives a brief description of the cuprate structures where the role of oxygen ordering for the physical properties in the model compound YBa2Cu3O7 is particularly emphasized. Section 3 is devoted to some fundamental aspects of Raman spectroscopy and to their application to high-Tc superconductors. Emphasis is on low-temperature vibrational spectra, rather than electronic contributions. Studies of oxygen isotope labeled materials and intercalation compounds are also included. Section 4 is more concerned with applied topics and focuses on the spectral study of the morphology of thin films: oxygen-disorder and oxygen underdoping are current issues in the field. The last section is a concise review of spectroscopic studies for another very fascinating class of materials: the organic superconductors (BEDT-TTF)2X and the MxC60 fullerides which are at present well documented in the literature.

Unité Mixte de Recherche nol 10 CNRS-Université de Nantes. Work partly presented at the 207th American Chemical Society Meeting, San Diego, March 94. The Raman spectra reproduced in this chapter were all recorded by the author at Laboratoire de Physique Cristalline, Nantes, France, except for two of them taken from the literature (Burns et al.). A commercial Jobin-Yvon T64000 micro-Raman spectrometer was used.

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  1. Laboratoire de Physique Cristalline, Institut des Matériaux de Nantes, 2 rue de la Houssinière, F-44072, Nantes Cedex, France

    Eric Faulques

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  1. Lawrence Berkeley National Laboratory, Berkeley, California, USA

    Dale L. Perry

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Faulques, E. (1997). Raman Spectra of Unconventional Superconductors. In: Perry, D.L. (eds) Materials Synthesis and Characterization. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-0145-3_3

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