OXYGEN-CONTENT, CRYSTAL-STRUCTURE, AND SUPERCONDUCTIVITY IN YSR2CU2.75MO0.25O7+DELTA

Authors
CAO GH QIAN YT WEI QQ CHEN ZY LU B MAO ZQ SHI L ZHANG YH
Citation
Gh. Cao et al., OXYGEN-CONTENT, CRYSTAL-STRUCTURE, AND SUPERCONDUCTIVITY IN YSR2CU2.75MO0.25O7+DELTA, Physica status solidi. b, Basic research, 189(1), 1995, pp. 171-175
Citations number
10
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physica status solidi. b, Basic research → ACNP
ISSN journal
03701972
Volume
189
Issue
1
Year of publication
1995
Pages
171 - 175
Database
ISI
SICI code
0370-1972(1995)189:1<171:OCASIY>2.0.ZU;2-X
Abstract
Polycrystalline samples of YSr2Cu2.75Mo0.25O7+delta with different oxy gen contents are investigated by powder X-ray diffraction and selected area electron diffraction. The temperature dependence of resistivity and the oxygen content are determined. The air-sintered sample is tetr agonal and semiconductive, while the O-2-sintered sample is orthorhomb ic and superconducting at 26 K. It is suggested that the structural va riation originates from the (Cu(1), Mo)O-1+delta layers and the superc onductivity is induced by the excess oxygen rather than charge redistr ibution between Cu(1) and Cu(2).