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- W2054417557 abstract "In the present paper, lattice anharmonicity contribution to the temperature dependent ultrasonic longitudinal and shear velocities propagated in ErBa2Cu3O6·9, GdBaSrCu3O7– δ and TlSr2CaCu2O7– δ ceramics were evaluated using the Nava model to compute their longitudinal (γLeff) and shear (γSeff) Gruneisen parameters. Ultrasonic velocity for both longitudinal and shear modes for oxygen rich samples showed deviation from anharmonicity theoretical curves at higher temperatures. Reduction of oxygen content by quenching reduced the deviation significantly for all samples. The results also showed that for all oxygen rich and oxygen reduced samples, the value of γLeff is substantially larger than γSeff, indicating that the samples are dominated by longitudinal acoustic mode anharmonicity. However, the effect of oxygen reduction on the Gruneisen parameter is not consistent for all samples. For Er123 and TlSr1212, oxygen reduction caused γLeff to decrease and γSeff to increase but for Gd1113 it caused an increase in γ eff for both modes. The possible relationship between Gruneisen parameter and superconductivity is discussed." @default.
- W2054417557 created "2016-06-24" @default.
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- W2054417557 date "2009-09-01" @default.
- W2054417557 modified "2023-09-25" @default.
- W2054417557 title "Gruneisen parameter and anharmonic contribution to temperature dependent ultrasonic velocity in RE based and Tl based superconductors with different oxygen contents" @default.
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- W2054417557 doi "https://doi.org/10.1179/143307509x441522" @default.
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