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Title: Large Ca isotope effect in the CaC{sub 6} superconductor.

Abstract

We have measured the Ca isotope effect coefficient, {alpha}(Ca), in the newly discovered superconductor CaC{sub 6} and find a value of 0.53(2). This result shows that the superconductivity is dominated by coupling of the electrons by Ca phonon modes. The C phonons contribute very little, assuming that this material is a conventional electron-phonon coupled superconductor. Thus, in contrast to another layered material MgB{sub 2}, where high-energy phonons in the B layers are responsible for the superconductivity, in layered CaC{sub 6} the phonons responsible for superconductivity are primarily low-energy modes of the intercalated Ca.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
957384
Report Number(s):
ANL/MSD/JA-56361
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US1000690
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Rev. Lett.; Journal Volume: 75; Journal Issue: 014509 ; 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ELECTRONS; ISOTOPE EFFECTS; PHONONS; SUPERCONDUCTIVITY; SUPERCONDUCTORS

Citation Formats

Hinks, D. G., Rosenmann, D., Claus, H., Bailey, M. S., Jorgensen, J. D., and Materials Science Division. Large Ca isotope effect in the CaC{sub 6} superconductor.. United States: N. p., 2007. Web. doi:10.1103/PhysRevB.75.014509.
Hinks, D. G., Rosenmann, D., Claus, H., Bailey, M. S., Jorgensen, J. D., & Materials Science Division. Large Ca isotope effect in the CaC{sub 6} superconductor.. United States. doi:10.1103/PhysRevB.75.014509.
Hinks, D. G., Rosenmann, D., Claus, H., Bailey, M. S., Jorgensen, J. D., and Materials Science Division. Mon . "Large Ca isotope effect in the CaC{sub 6} superconductor.". United States. doi:10.1103/PhysRevB.75.014509.
@article{osti_957384,
title = {Large Ca isotope effect in the CaC{sub 6} superconductor.},
author = {Hinks, D. G. and Rosenmann, D. and Claus, H. and Bailey, M. S. and Jorgensen, J. D. and Materials Science Division},
abstractNote = {We have measured the Ca isotope effect coefficient, {alpha}(Ca), in the newly discovered superconductor CaC{sub 6} and find a value of 0.53(2). This result shows that the superconductivity is dominated by coupling of the electrons by Ca phonon modes. The C phonons contribute very little, assuming that this material is a conventional electron-phonon coupled superconductor. Thus, in contrast to another layered material MgB{sub 2}, where high-energy phonons in the B layers are responsible for the superconductivity, in layered CaC{sub 6} the phonons responsible for superconductivity are primarily low-energy modes of the intercalated Ca.},
doi = {10.1103/PhysRevB.75.014509},
journal = {Phys. Rev. Lett.},
number = 014509 ; 2007,
volume = 75,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}