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- W1968610405 abstract "Isotropic powders and magnetically aligned crystallites of ${mathrm{EuBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$ (1:2:3) and europium-doped ${mathrm{Bi}}_{2}$${mathrm{Sr}}_{2}$${mathrm{CaCu}}_{2}$${mathrm{O}}_{8}$ (2:2:1:2) were studied by means of x-ray diffraction and $^{151}mathrm{Eu}$ Mossbauer spectroscopy. The degree of crystallite orientation of the samples and the values of the lattice constants were determined by x-ray diffraction. The Mossbauer spectra were analyzed considering the full hyperfine Hamiltonian of the nuclear states of the 21.5-keV ensuremath{gamma} transition. The Mossbauer hyperfine parameters obtained from the superconducting and semiconducting phases are presented. A small change is seen in the $^{151}mathrm{Eu}$ isomer shift when the oxygen deficiency ensuremath{delta} of the 1:2:3 compound is varied. The shift can be explained by a decrease in the s-electron density due to lattice expansion. The changes in the oxidation state of the copper atoms with varying ensuremath{delta} were determined from the Mossbauer data: The Cu(2) atoms retain their oxidation state, whereas the Cu(1) atoms adjust their valence according to the value of ensuremath{delta}. In the 2:2:1:2 samples, the Eu concentration clearly affected the value of the electric-field gradient at the Eu nucleus. Using a standard procedure, magnetically aligned 2:2:1:2 samples were prepared. The preferred direction of the crystal c axis changed from parallel to perpendicular alignment with the external magnetic field, when the Eu concentration exceeded 20% of the Ca atoms." @default.
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- W1968610405 date "1992-10-01" @default.
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- W1968610405 title "Europium-based high-temperature superconductors studied by x-ray diffraction and<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant=normal>Eu</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>151</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>Mössbauer spectroscopy" @default.
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- W1968610405 doi "https://doi.org/10.1103/physrevb.46.8534" @default.
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