Crystal structure and valence transition temperature of YbInCu4 single crystals

Abstract We performed X-ray crystal structure analysis of YbInCu 4 single crystals grown by the flux and Bridgman methods. It turns out that the crystal structure is generally expressed by the formula of Yb(In 1− p Cu p )Cu 4 . The valence transition temperature is T v ≈42 K for the stoichiometric YbInCu 4 while T v =63 K for Yb(In 0.89 Cu 0.11 )Cu 4 . We conclude that T v generally becomes large with increasing p .