Abstract

Magnetic Mössbauer spectra have been observed at low temperature for samples of YBa 2(Cu 1− x Fe x ) 3O 6.5+ p with Fe levels x = 0.01, 0.02, 0.04, 0.10 and 0.20. Fits to these complex magnetic spectra were constrained by simultaneous fitting of low temperature magnetic and high temperature nonmagnetic spectra of the same sample. The fits revealed two magnetic components, an Fe 3+ magnetic sextet most prominent at x = 0.20 and, for smaller values of x, a complex component whose fitting required a distribution of magnetic hyperfine fields. The temperature dependence of the hyperfine fields of this latter component gave values of T hf where the magnetic hyperfine field appears.

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