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

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Title: Effect of molecular intercalation on the local structure of superconducting Nax(NH3)yMoSe2 system.
Authors: Simonelli, L.1, Paris, E.2, Wakita, T.3, Marini, C.1, Terashima, K.3, Miao, X.3, Olszewski, W.1,4, Ramanan, N.1, Heinis, D.1, Kubozono, Y.3, Yokoya, T.3, Saini, N.L.2 Naurang.saini@roma1.infn.it
Source: Journal of Physics & Chemistry of Solids. Dec2017, Vol. 111, p70-74. 5p.
Subjects: Desorption, X-ray absorption, Molecules, Ions, Superconductivity
Abstract: We have studied the local structure of layered Na x (NH 3 ) y MoSe 2 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 MoSe 2 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 NH 3 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 MoSe 2 and superconductivity at low temperature. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Physics & Chemistry of Solids is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 125178362
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Effect of molecular intercalation on the local structure of superconducting Nax(NH3)yMoSe2 system.
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  Data: <searchLink fieldCode="AR" term="%22Simonelli%2C+L%2E%22">Simonelli, L.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Paris%2C+E%2E%22">Paris, E.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Wakita%2C+T%2E%22">Wakita, T.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Marini%2C+C%2E%22">Marini, C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Terashima%2C+K%2E%22">Terashima, K.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Miao%2C+X%2E%22">Miao, X.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Olszewski%2C+W%2E%22">Olszewski, W.</searchLink><relatesTo>1,4</relatesTo><br /><searchLink fieldCode="AR" term="%22Ramanan%2C+N%2E%22">Ramanan, N.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Heinis%2C+D%2E%22">Heinis, D.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kubozono%2C+Y%2E%22">Kubozono, Y.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Yokoya%2C+T%2E%22">Yokoya, T.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Saini%2C+N%2EL%2E%22">Saini, N.L.</searchLink><relatesTo>2</relatesTo><i> Naurang.saini@roma1.infn.it</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Physics+%26+Chemistry+of+Solids%22">Journal of Physics & Chemistry of Solids</searchLink>. Dec2017, Vol. 111, p70-74. 5p.
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  Data: <searchLink fieldCode="DE" term="%22Desorption%22">Desorption</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+absorption%22">X-ray absorption</searchLink><br /><searchLink fieldCode="DE" term="%22Molecules%22">Molecules</searchLink><br /><searchLink fieldCode="DE" term="%22Ions%22">Ions</searchLink><br /><searchLink fieldCode="DE" term="%22Superconductivity%22">Superconductivity</searchLink>
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  Data: We have studied the local structure of layered Na x (NH 3 ) y MoSe 2 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 MoSe 2 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 NH 3 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 MoSe 2 and superconductivity at low temperature. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Physics & Chemistry of Solids is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.jpcs.2017.07.011
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      – Code: eng
        Text: English
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        PageCount: 5
        StartPage: 70
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      – SubjectFull: Desorption
        Type: general
      – SubjectFull: X-ray absorption
        Type: general
      – SubjectFull: Molecules
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      – SubjectFull: Ions
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      – SubjectFull: Superconductivity
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      – TitleFull: Effect of molecular intercalation on the local structure of superconducting Nax(NH3)yMoSe2 system.
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              Text: Dec2017
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