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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T. Siegrist, S. Sunshine et al., Physical Review, 13(1987), 7137.[2] M. A. Meno, L. Soderholm et al., Appl, Phys. Lett., 51(1) (1987), 57.[3] J. D. Jorgensen, M. A. Meno et al., Physical Review, 7(1987), 3608.[4] J. Fontcuberta, X. Obradors et al., Condensed Matter, 73(1988), 143.[5] A. Nath, S. Nagy et al., Solid State Communications 2(1988), 181.[6] A. Simopoulos and D. Niarchos, Physical Review, 13(1988), 8931.[7] 杨应昌等，物理学报，1(1990)，111,[8] H. Tang, Z. Q. Qiu et al., Physical Rewiew, 7(1987), 4018.[9] Z. Q. Qiu, Y. W. Du ct al., J. Magnetism and Magnetic Material, 78(1989), 359[10] 都有为等，物理学报，3(1990)，472,[11] E. Baggio-Saitovich et al., Physical Review, 13(1988), 7967.[12] R. A. Brand et al., Physica, C156(1988), 539.[13] K. Donnelly et al., Physica, C156(1988), 579.[14] P. Boolchand et al., Physical Review, 16(1988), 11313.[15] Brcmert, C. Michaelsen et al., J. Applied Physics, 65(3) (1989), 1018.[16] 孟建等，低温与超导，1(1990)，54.

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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.