Electronic Conductivity

This chapter focuses on electronic conductivity in perovskites. The electrons in perovskites are believed to be strongly correlated; that is, they do not behave as a classical electron gas, but are the subject to electron‐electron interactions. This leads to considerable modification of the collecti...

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Bibliographic Details
Published inPerovskites pp. 247 - 276
Format Book Chapter
LanguageEnglish
Published Chichester, UK John Wiley & Sons, Ltd 06.05.2016
Subjects
collosal magnetoresistance
electronic conductivity
metal‐insulator transitions
perovskite band structure
perovskite superconductors
semiconductivity
spin polarisation
surface conductivity
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ISBN9781118935668
1118935667
DOI10.1002/9781118935651.ch8

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Summary:This chapter focuses on electronic conductivity in perovskites. The electrons in perovskites are believed to be strongly correlated; that is, they do not behave as a classical electron gas, but are the subject to electron‐electron interactions. This leads to considerable modification of the collective electron behaviour of the conduction electrons, resulting in metal‐insulator transitions (MIT), high‐temperature superconductivity, half‐metals and colossal magnetoresistance (CMR). The effects of strong correlation are important for the 3d, 4d and 4f elements. The structural features that prevent the formation of an expected metallic perovskite are rather finely balanced, and a number of phases which lie on the cusp of metallic/non‐metallic behaviour are known. Because of the ease with which A‐, Band X‐site substitutions can be made in perovskites, the spin states and electronic conductivity of phases can be juggled between metallic and semiconducting/insulating, allowing these MIT to be investigated.
ISBN:9781118935668
1118935667
DOI:10.1002/9781118935651.ch8