Mössbauer Study of High Tc GdBa2Cu3O7-δ

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Chen Zhiqian, Zheng Renrong and Yin Chuanzong. Mössbauer Study of High Tc GdBa2Cu3O7-δ[J]. Chinese Physics C, 1992, 16(S2): 117-122.
Chen Zhiqian, Zheng Renrong and Yin Chuanzong. Mössbauer Study of High Tc GdBa2Cu3O7-δ[J]. Chinese Physics C, 1992, 16(S2): 117-122. shu
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Received: 1991-07-08
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    Partly supported by Chongqing Doctorate Foundation.

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Mössbauer Study of High Tc GdBa2Cu3O7-δ

  • Department of Physics, Southwest Normal University, Chongqing, Sichuan. China
Fund Project:  Partly supported by Chongqing Doctorate Foundation.

Abstract: 57Fe-Mössbauer spectra of GdBa2(Cu1-xFex)3O7-δ(x=0.005) are studied in a wide temperature range (1.4-700 K), and the valence states and surroundings of iron cations are analyzed. There are four sites for Fe:A,B, C and D. Fe(A), Fe(B) and Fe(C) occupy Cu(l) sites with different O-coordinations. Fe(D) is attributed to a Cu(2) site with only one definite O-surrounding. The Fe cations are identified as high spin 4+ at site B and 3+ at site D. Alignment of polycrystalline powder absorber in a magnetic field leads to small texture effects.

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