Chemical doping and improved flux pinning in Hg-based superconductors
- Univ. of Tokyo (Japan); and others
Chemical doping of a small amount (0.02{approximately}0.3) of rhenium (Re) ion into HgBa{sub 2}Ca{sub n{minus}1}Cu{sub n}O{sub y}(n=1{approximately}4) has been studied. The flux pinning strength in these Hg-based superconductors is significantly enhanced compared to the undoped parent materials. Neutron diffraction analysis of representative samples (n=3) revealed that Re partially substitutes the Hg-site with octahedrally fully coordinated oxygen atoms, giving rise to the stabilization of Hg(Re)O layer and reduction of this blocking layer thickness. Associated with the expected hybridization of Re-5d and O-2p orbitals and possible metallization of the Hg(Re)O layer, the improved flux pinning behavior is considered to be caused by the decrease of the electromagnetic anisotropy and the enhanced interlayer superconducting coupling strength.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 443670
- Report Number(s):
- CONF-960808--
- Journal Information:
- Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 5-6 Vol. 105; ISSN 0022-2291; ISSN JLTPAC
- Country of Publication:
- United States
- Language:
- English
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