Effect of molecular intercalation on the local structure of superconducting Nax(NH3)yMoSe2system
| Autor: | Takanori Wakita, Eugenio Paris, Yoshihiro Kubozono, Carlo Marini, Xiao Miao, Nitya Ramanan, Wojciech Olszewski, Naurang L. Saini, Laura Simonelli, Kensei Terashima, Takayoshi Yokoya, D. Heinis |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Superconductivity
Extended X-ray absorption fine structure Bond strength Chemistry Intercalation (chemistry) Inorganic chemistry 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Ion symbols.namesake Chemical physics symbols Einstein solid Molecule General Materials Science Absorption (chemistry) 0210 nano-technology Dichalcogenides Intercalation effect Local disorder Chemistry (all) Materials Science (all) |
| Popis: | 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 ( Θ E ) 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 Θ E 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. |
| Databáze: | OpenAIRE |
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