151Eu Mössbauer effect study of Pb2Sr2Eu.3Ca.7Cu3O8+z superconductor
Work supported by the Center of Fundamental Materials Research, Michigan State University, East Lansing. MI 48224, U.S.A.
151-Eu Mössbauer Effect measurements have been performed on the title superconductor at 78 K. The quadrupole coupling constant ( −168 ± 14 MHz) is found to be small and negative. The isomer shift ( 0.78 ± .03 mm/s relative to EuF3) implies that Eu is trivalent in the compound.