M&#246;ssbauer Study of High Tc GdBa2Cu3O7-δ

Chen Zhiqian; Zheng Renrong; Yin Chuanzong

Chinese Physics C> 1992, Vol. 16> Issue(S2) : 117-122

Mössbauer Study of High T_c GdBa₂Cu₃O_7-δ

Department of Physics, Southwest Normal University, Chongqing, Sichuan. China

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Abstract：
⁵⁷Fe-Mössbauer spectra of GdBa₂(Cu_1-xFe_x)₃O_7-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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Chen Zhiqian, Zheng Renrong and Yin Chuanzong. Mössbauer Study of High T_c GdBa₂Cu₃O_7-δ[J]. Chinese Physics C, 1992, 16(S2): 117-122.

Chen Zhiqian, Zheng Renrong and Yin Chuanzong. Mössbauer Study of High T_c GdBa₂Cu₃O_7-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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沈阳化工大学材料科学与工程学院沈阳 110142

Mössbauer Study of High T_c GdBa₂Cu₃O_7-δ

Department of Physics, Southwest Normal University, Chongqing, Sichuan. China

Received Date: 1991-07-08

Fund Project: Partly supported by Chongqing Doctorate Foundation.

Abstract: ⁵⁷Fe-Mössbauer spectra of GdBa₂(Cu_1-xFe_x)₃O_7-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.