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A NEW 1212-TYPE PHASE: <font>Cr</font>-SUBSTITUTED <font>TlSr</font><sub>2</sub><font>CaCu</font><sub>2</sub><font>O</font><sub>7</sub> WITH T<sub>c</sub> UP TO ABOUT 110 K
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1991
Year
Materials ScienceTlsr 2Superconducting MaterialHigh-tc SuperconductivityEngineeringHigh-temperature SuperconductivityCryogenicsSuperconductivityCondensed Matter PhysicsApplied PhysicsHigh Tc SuperconductorsCrtlsrcacuo SystemObserved SuperconductivityChemistryNew 1212-Type PhaseLow-temperature Superconductivity
Superconductivity up to about 110 K in the CrTlSrCaCuO system was observed by resistance and ac susceptibility measurements. Powder X-ray diffraction analyses showed that a 1212-type phase, Cr -substituted TlSr 2 CaCu 2 O 7 , is responsible for the observed superconductivity. This is the first time that single-element substitution for TlSr 2 CaCu 2 O 7 increases T c of the 1212 phase to above 100 K. The Cr -substituted TlSr 2 CaCu 2 O 7 is easily prepared and has very good quality suitable for practical applications.