Journal
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
Volume 22, Issue 3, Pages 295-298Publisher
SPRINGER
DOI: 10.1007/s10948-008-0428-7
Keywords
Cobaltate superconductor; Charge density wave order; Two electron bands
Categories
Funding
- US Department of Energy [DE-AC02-05CH11231]
- NSF [DMR-0213706]
- DOE-BES [DE-FG02-98-ER45706]
- DAAD
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Three samples of Na(0.3)CoO(2)a <...1.3H(2)O that differed in sample age showed different ordering: after three and five days, superconductivity with T (c)similar to 4.5 K but different superconducting condensates; after 40 days, no superconductivity but charge-density wave order at T (CDW)similar to 7 K. A pair-breaking action that progresses with sample age and acts preferentially in one of two electron bands produces the changes in the superconducting condensate, and ultimately destroys the superconductivity. Theoretical calculations predicted the charge-density wave transition.
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