Binding Strength and Oxygen Coordination of the Fe Sites in High TC GdBa2 Cu3O7—δ

CHEN Zhiqian

Chinese Physics C> 1993, Vol. 17> Issue(11) : 971-975

Binding Strength and Oxygen Coordination of the Fe Sites in High T_C GdBa₂ Cu₃O_7—δ

CHEN Zhiqian ^,

Depar tment of Physics,Southwest China Normal University,Chongqing 630715

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Abstract：
The GdBa₂(Cu_1－xFe_x)₃O_7—δ system with x=0.005－0.001 and various oxygen concentrations was investigated by ⁵⁷Fe-Mossbauer spectroscopy in temperature range 20K to 300K.The spectra of the orthorhombic phase were analyzed with four quadrupole doublets.Three of them were attributed to substitutional Cu(1) sites and one (with the smallest quadrupole splitting)to the substitutional Cu(2) site.From an analysis of temperature dependence of the relative site intensities,different local Debye temperature for the Cu(1) sites were derived.Highly texturized absorbers were investigated to study the polarization dependence of the four quadrupole doublets.Measurements at the magic angle gave evidence for a vibrational anisotropy (Goldanskii-Karyagineffect) of the Cu(1) sites.The Cu(1) site with the largest quadrupole splitting exhibited the lowest Debye temperature and the largest vibrational anisotropy.

References

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see,e.g. :Proc.ICAME'89:Hyperfine Interactions55(1990).[2]H. ]. Bornemann et. al. ,J. Phys. ,F15(1987),L337.[3]G. Wortmann et. al. ,Phys. Lett,A126(1988),434.[4]I. Nowik et. al. ,Phys. Rev. ,B33(1988),6677.[5]V. M. Cherepanov et. al. ,JETP Letter,47(1988),425.[6]G. Wortmann et. al. ,Hyperfine Interactions,50(1989),555.[7]P. Hettkamp et. al. ,"MiSssbauer Effect of High Tc 1-2-3 Systems", to be Published.[8]陈志谦等，高能物理与核物理，16(1992),385.

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CHEN Zhiqian. Binding Strength and Oxygen Coordination of the Fe Sites in High T_C GdBa₂ Cu₃O_7—δ[J]. Chinese Physics C, 1993, 17(11): 971-975.

CHEN Zhiqian. Binding Strength and Oxygen Coordination of the Fe Sites in High T_C GdBa₂ Cu₃O_7—δ[J]. Chinese Physics C, 1993, 17(11): 971-975. shu

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

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Binding Strength and Oxygen Coordination of the Fe Sites in High T_C GdBa₂ Cu₃O_7—δ

CHEN Zhiqian ^,

Corresponding author: CHEN Zhiqian,

Depar tment of Physics,Southwest China Normal University,Chongqing 630715

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 1993-11-05

Abstract: The GdBa₂(Cu_1－xFe_x)₃O_7—δ system with x=0.005－0.001 and various oxygen concentrations was investigated by ⁵⁷Fe-Mossbauer spectroscopy in temperature range 20K to 300K.The spectra of the orthorhombic phase were analyzed with four quadrupole doublets.Three of them were attributed to substitutional Cu(1) sites and one (with the smallest quadrupole splitting)to the substitutional Cu(2) site.From an analysis of temperature dependence of the relative site intensities,different local Debye temperature for the Cu(1) sites were derived.Highly texturized absorbers were investigated to study the polarization dependence of the four quadrupole doublets.Measurements at the magic angle gave evidence for a vibrational anisotropy (Goldanskii-Karyagineffect) of the Cu(1) sites.The Cu(1) site with the largest quadrupole splitting exhibited the lowest Debye temperature and the largest vibrational anisotropy.