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Unconventional superconductivity and strong electronic correlations in molybdenum cluster compounds

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Defense Thèse de doctorat : Univ. Genève, 2009 - Sc. 4116 - 2009/07/15
Abstract Ternary compounds based on molybdenum chalcogenide clusters Mo6X8 display a wide variety of physical properties, depending on both their composition and crystal structure. When assembled into a three-dimensional network, they form the well-known “Chevrel phase” materials MMo6X8, many of which become superconducting at low temperature. However, they may also condense into highly one-dimensional infinite-length chains with formula M2Mo6Se6. These materials either become superconducting or undergo a metal-insulator transition at low temperature, depending on the nature of the M atom. This thesis describes two powerful experimental techniques – sub-Kelvin scanning tunnelling microscopy (STM) and specific heat measurements – and their application to the study of the physical properties of various molybdenum cluster compounds. An explanation is provided for the behavioural trends seen across the M2Mo6Se6 family and a detailed analysis of the superconducting state performed for SnMo6S8 and PbMo6S8.
Stable URL http://archive-ouverte.unige.ch/unige:14928
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URN: urn:nbn:ch:unige-149281
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Deposited on : 2011-04-06

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