A NEW 1212-TYPE PHASE: Cr-SUBSTITUTED TlSr2CaCu2O7 WITH Tc UP TO ABOUT 110 K

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Abstract
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 Tc 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.