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Signature of twin planes in Mössbauer spectroscopy of cuprate superconductors (1990)

Boolchand, P. ; Blue, C. ; Elgaid, K. ; [weitere]

Springer

Hyperfine interactions 62 (1990), S. 73-88

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ISSN: 1572-9540

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract One of the four quadrupole doublets (A, B, C, and D) observed in Mössbauer spectra of orthorhombic (Y or RE)1Ba2(Cu1-xFex)307-δ(δ≈0) samples is identified with Fe dopant replacing a Cu site in twin planes. The site in question, labelled as D, is characterized by a quadrupole splitting ΔD in the range 1.6±0.1 mm/s. The D-site intensity is found to approach zero when the 1-2-3, material is driven tetragonal, either upon oxygen desorption, upon oxygen loading, or upon increasing the Fe-dopant concentration.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02407664

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Digitale Medien

Fe-site assignments in Y1Ba2Cu3O7 revisited (1992)

Boolchand, P. ; McDaniel, D. ; Blue, C. ; [weitere]

Springer

Hyperfine interactions 68 (1992), S. 15-25

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ISSN: 1572-9540

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract A new symmetric Fe3+ site (labelled E) (δ=0.28(2) mm/s and Δ=0.15 mm/s) is observed in the R1Ba2Cu3O7 family of superconductors for R=Y and Eu. The decay and growth of site E are established in two seemingly unrelated experiments, one as a function of room temperature aging for R=Y, and the other as a function of oxygen loading at elevated temperatures and pressures for R=Eu. In each experiment, the results show that site E is genetically related to the well documented chainsites A(Δ=1.9 mm/s), C(Δ=1.1 mm/s) and D(Δ=1.6 mm/s). We propose that site E represents a quasi-octahedral chain-site having pairs of O(1), O(4) and O(5) nearestneighbor oxygen sites. The two remaining doublets, B(Δ≈0.4 mm/s) and B′(Δ=0.78 mm/s) represent Fe3+ dopant sites present in the all-important CuO2 planes, possessing coordination numbers of 6 and 5, respectively.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02396448

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