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 language | English |
|---|---|
| Pages (from-to) | 70-74 |
| Number of pages | 5 |
| Journal | Journal of Physics and Chemistry of Solids |
| Volume | 111 |
| DOIs | |
| Publication status | Published - Dec 1 2017 |
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Keywords
- Dichalcogenides
- Intercalation effect
- Local disorder
- Superconductivity
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics
Cite this
Effect of molecular intercalation on the local structure of superconducting Nax(NH3)yMoSe2 system. / Simonelli, L.; Paris, E.; Wakita, Takanori; Marini, C.; Terashima, Kensei; Miao, X.; Olszewski, W.; Ramanan, N.; Heinis, D.; Kubozono, Yoshihiro; Yokoya, Takayoshi; Saini, N. L.
In: Journal of Physics and Chemistry of Solids, Vol. 111, 01.12.2017, p. 70-74.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of molecular intercalation on the local structure of superconducting Nax(NH3)yMoSe2 system
AU - Simonelli, L.
AU - Paris, E.
AU - Wakita, Takanori
AU - Marini, C.
AU - Terashima, Kensei
AU - Miao, X.
AU - Olszewski, W.
AU - Ramanan, N.
AU - Heinis, D.
AU - Kubozono, Yoshihiro
AU - Yokoya, Takayoshi
AU - Saini, N. L.
PY - 2017/12/1
Y1 - 2017/12/1
N2 - 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.
AB - 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.
KW - Dichalcogenides
KW - Intercalation effect
KW - Local disorder
KW - Superconductivity
UR - http://www.scopus.com/inward/record.url?scp=85024923069&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85024923069&partnerID=8YFLogxK
U2 - 10.1016/j.jpcs.2017.07.011
DO - 10.1016/j.jpcs.2017.07.011
M3 - Article
AN - SCOPUS:85024923069
VL - 111
SP - 70
EP - 74
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
SN - 0022-3697
ER -