An investigation on the role of spin fluctuations in the superconductivity of the spinel oxide LiTi2O4
Among the over 300 known spinel compounds, only four exhibit superconducting properties with LiTi2O4 (LTO) being the only non-disordered transition metal oxide. Despite its superconductivity (SC) identified in 1973, understanding of its SC mechanism has seen slow progress due to sample reproducibility. A recent renewed interest concerning the role of spin correlations in LTO began with an investigation of applying a quantum site percolation model (QSPM) to the series Li1+xTi2-xO4. Disagreement between theory and laboratory measurements lead to the hypothesis that correlations play a significant role in the SC. This hypothesis was supported by extensive charge transport and tunneling measurements on LTO films, revealing anomalous magnetoresistance behaviour. Despite evidence provided for the crucial role of spin fluctuations for SC in LTO, neutron studies have been limited to diffraction. We propose to use the IN5 with the aim to measure the T-dependence of the (|Q|,E) spectrum of isotopically pure 7LTO powder with the objective of confirming both (i) that LTO is not a conventional BCS superconductor and (ii) the crucial role played by fluctuations in the SC mechanism in LTO.
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SARTE Paul; J. Paul Attfiel;d; BROWNE Alexander; FAK Bjorn; OLLIVIER Jacques and WIEBE Christopher. (2016). An investigation on the role of spin fluctuations in the superconductivity of the spinel oxide LiTi2O4. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-02-473
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