Mössbauer, crystal-structure, magnetic, and Raman studies of the (Y,Ce)2Sr2CuFeO8 compound isomorphic to superconductors with the T* structure

M. Pissas; C. Mitros; D. Niarchos; A. Kostikas; A. Simopoulos; M. Abrashev; V. Hadjimitov; M. Iliev

doi:10.1103/PhysRevB.50.10157

← Back to search

Mössbauer, crystal-structure, magnetic, and Raman studies of the (Y,Ce)2Sr2CuFeO8 compound isomorphic to superconductors with the T* structure

M. Pissas, C. Mitros, D. Niarchos, A. Kostikas, A. Simopoulos, M. Abrashev, V. Hadjimitov, M. Iliev

DOI 10.1103/PhysRevB.50.10157 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

The crystal structure, the magnetic and transport properties, and the lattice vibrations of the (Y,Ce)2Sr2CuFeO8 compound were studied by Rietveld refinement, Mössbauer spectroscopy, dc magnetic susceptibility, electrical-resistivity measurements, and Raman spectroscopy. The Rietveld-refinement results and Raman spectra show that the space group which describes the structure is P4mm. Mössbauer spectra can be fitted with one component with hyperfine parameters which correspond to Fe+3 in a high-spin state coordinated by five oxygen atoms arranged in a square pyramid. Most of the observed phonon lines can be assigned to definite atomic vibrations. Magnetic measurements show an antiferromagnetic transition at 30 K. Fitting of dc-susceptibility data in the paramagnetic region gives an effective magnetic moment of (3.6±0.1)μB per ion. The resistivity data show insulating behavior.