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  Electronic properties of the yttriumdicarbide superconductors YC2, Y1-xThxC2, Y1-xCaxC2 (0<x<~0.3)

Gulden, T., Henn, R. W., Jepsen, O., Kremer, R. K., Schnelle, W., Simon, A., et al. (1997). Electronic properties of the yttriumdicarbide superconductors YC2, Y1-xThxC2, Y1-xCaxC2 (0<x<~0.3). Physical Review B, 56(14), 9021-9029. doi:10.1103/PhysRevB.56.9021.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-607B-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-6089-9
Genre: Journal Article

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Gulden, Th.1, Author
Henn, R. W.1, Author
Jepsen, O.1, Author
Kremer, R. K.1, Author
Schnelle, W.1, Author
Simon, A.1, Author
Felser, C.2, Author              
Affiliations:
1external, ou_persistent22              
2External Organizations, ou_persistent22              

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 Abstract: We characterize the superconducting state of the carbides YC2, Y1-xThxC2, and Y1-xCaxC2 (0<x less than or equal to 0.3) by means of magnetization and specific-heat measurements. YC2 is-a superconductor with T-c=4.02(5) K. Partial substitution with Ca and Th, as well as doping with the strongly pair breaking Gd, reduces the critical temperature. Isothermal magnetization measurements on YC2 indicate a superconducting behavior close to the type-I limit with B-c2(0)=59(2) mT. Specific-heat data of YC2, Y0.8Th0.2C2, and Y0.9Ca0.1C2 are analysed in terms of weak-coupling BCS theory and the ct model. The comparison with the model predictions as well as the C-12/C-13-isotope effect on T-c indicate excellent agreement with weak-coupling BCS theory for YC2. A strong dependence of the superconducting properties on the carbon deficiency is observed. We describe high-temperature annealing procedures to optimize the superconducting properties of the samples. Ab initio calculations of the electronic band structure using the tight-binding linear muffin-tin orbital atomic-sphere approximation method are presented and the density of states at the Fermi energy is discussed in view of the experimental Pauli susceptibilities and heat-capacity results.

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 Dates: 1997-10-01
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: A1997YC73100073
DOI: 10.1103/PhysRevB.56.9021
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Title: Physical Review B
  Other : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 56 (14) Sequence Number: - Start / End Page: 9021 - 9029 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008