Mossbauer Study of GdBa2Cu3O7－δ

CHEN Zhi-Qian; ZHENG Ren-Rong; YIN Chuan-Zong

Chinese Physics C> 1992, Vol. 16> Issue(5) : 385-389

Mossbauer Study of GdBa₂Cu₃O_7－δ

Department of Physics,Southwest China Normal University.Chongqing 630715

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Abstract：
⁵⁷Fe-Mossbauer spectra of GdBa₂ (Cu_1－xFe_x)O_7－δ (x=0.005) are studied at a wide temperature range (1.4K－700K),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 (1) sites with different O-coordinations.Fe(D) is attributed to a Cu(2) site with only one defined O-surrounding.The Fe cations are identified as high spin 4+ at site B and 3+ at site D.Alignment of powder absorber in a magnetic field leads to small texture effects.

References

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CHEN Zhi-Qian, ZHENG Ren-Rong and YIN Chuan-Zong. Mossbauer Study of GdBa₂Cu₃O_7－δ[J]. Chinese Physics C, 1992, 16(5): 385-389.

CHEN Zhi-Qian, ZHENG Ren-Rong and YIN Chuan-Zong. Mossbauer Study of GdBa₂Cu₃O_7－δ[J]. Chinese Physics C, 1992, 16(5): 385-389. shu

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Received: 1900-01-01
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Mossbauer Study of GdBa₂Cu₃O_7－δ

Corresponding author: CHEN Zhi-Qian,

Department of Physics,Southwest China Normal University.Chongqing 630715

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 1992-05-05

Abstract: ⁵⁷Fe-Mossbauer spectra of GdBa₂ (Cu_1－xFe_x)O_7－δ (x=0.005) are studied at a wide temperature range (1.4K－700K),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 (1) sites with different O-coordinations.Fe(D) is attributed to a Cu(2) site with only one defined O-surrounding.The Fe cations are identified as high spin 4+ at site B and 3+ at site D.Alignment of powder absorber in a magnetic field leads to small texture effects.