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We have measured the quadrupole interaction parameter and the asymmetry coefficient at the 151Eu Mössbauer nucleus for EuBa2Cu3O7-δ, δ ≈ 0 and δ ≈ 1. The measurements have been extended up to 420 K and 600 K respectively. From the temperature dependence of the electric field gradient parameter VEuzz and the isomer shift we deduce that the contribution of the excited electronic state of EU3+ to the measured parameters is stronger in the superconducting than in the semiconducting oxide

STUDY OF THE ELECTRIC FIELD GRADIENT IN EuBa2Cu3O7-δ (δ ≈ 0 AND δ ≈ 1) BY 151Eu MÖSSBAUER SPECTROSCOPY

STUDY OF THE ELECTRIC FIELD GRADIENT IN EuBa₂Cu₃O_7-δ (δ ≈ 0 AND δ ≈ 1) BY ¹⁵¹Eu MÖSSBAUER SPECTROSCOPY