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Abstract
Polycrystalline samples of four intermetallic compounds: MV2Al20 (M=Sc, Y, La, and Lu) were synthesized using an arc-melting technique. The crystal structures were analyzed by means of powder x-ray diffraction and Rietveld analysis, and the physical properties were studied by means of heat capacity, electrical resistivity, and magnetic susceptibility measurements down to 0.4 K. For ScV2Al20, LuV2Al20, and YV2Al20, superconductivity was observed with critical temperatures Tc=1.00, 0.57, and 0.60 K, respectively. Superconductivity for the Lu compound is reported. Theoretical calculations of the electronic and phonon structures were conducted in order to analyze the superconductivity and dynamics in ScV2Al20, YV2Al20, and LuV2Al20 and to explain the lack of a superconducting transition in LaV2Al20 down to 0.4 K. The results of the experimental and theoretical studies show that all the compounds are weakly coupled type-II BCS superconductors, and reveal the importance of the M-atom anharmonic “rattling” modes for the superconductivity in these materials, which seem to enhance Tc, especially for ScV2Al20.
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Authors (7)
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B. Wiendlocha
- AGH University of Science and Technology Faculty of Physics and Applied Computer Science
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Małgorzata Sternik dr hab.
- Institute of Nuclear Physics, Polish Academy of Sciences -
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Piotr Wiśniewski
- Institute for Low Temperature and Structure Research, Polish Academy of Sciences -
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Jim O'Brien
- Off Grid Research -
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Dariusz Kaczorowski
- Institute for Low Temperature and Structure Research, Polish Academy of Sciences -
Cite as
Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1103/PhysRevB.93.134507
- License
- Copyright (2016 American Physical Society)
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Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
PHYSICAL REVIEW B
no. 93,
pages 1 - 17,
ISSN: 2469-9950 - Language:
- English
- Publication year:
- 2016
- Bibliographic description:
- Winiarski M., Wiendlocha B., Sternik M., Wiśniewski P., O'brien J., Kaczorowski D., Klimczuk T.: Rattling-enhanced superconductivity in MV2Al20 (M = Sc, Lu, Y) intermetallic cage compounds// PHYSICAL REVIEW B. -Vol. 93, nr. 134507 (2016), s.1-17
- DOI:
- Digital Object Identifier (open in new tab) 10.1103/physrevb.93.134507
- Verified by:
- Gdańsk University of Technology
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