Effect of molecular intercalation on the local structure of superconducting Nax(NH3)yMoSe2 system

L. Simonelli, E. Paris, T. Wakita, C. Marini, K. Terashima, X. Miao, W. Olszewski, N. Ramanan, D. Heinis, Y. Kubozono, T. Yokoya, N. L. Saini

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    1 Citation (Scopus)

    Abstract

    We have studied the local structure of layered Nax(NH3)yMoSe2 system by Mo K-edge extended X-ray absorption fine structure (EXAFS) measurements performed as a function of temperature. We find that molecular intercalation in MoSe2 largely affects the Mo-Se network while Mo-Mo seems to sustain small changes. The Einstein temperature (ΘE of Mo-Mo distance hardly changes (∼264 K) indicating that bond strength of this distance remains unaffected by intercalation. On the other hand, Mo-Se distance suffers a softening, revealed by the decrease of ΘE from ∼364 K to ∼350 K. The results indicate that Na+ ion transported by NH3 molecules may enter between the two MoSe-layers resulting reduced Se-Se coupling. Therefore, increased hybridization between Se 4p and Mo 4d orbitals due to inter-layer disorder is the likely reason of metallicity in intercalated MoSe2 and superconductivity at low temperature.

    Original languageEnglish
    Pages (from-to)70-74
    Number of pages5
    JournalJournal of Physics and Chemistry of Solids
    Volume111
    DOIs
    Publication statusPublished - Dec 2017

    Keywords

    • Dichalcogenides
    • Intercalation effect
    • Local disorder
    • Superconductivity

    ASJC Scopus subject areas

    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics

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