Abstract
Four samples of YBa2Cu3O7−x with different values of x were prepared and characterized, and their elastic properties from 80 K to room temperature were investigated. It was found that an anomalous softening of the elastic moduli G, K, and E temperatures slightly higher than T c appeared only on the specimens with the superconducting orthorhombic phase. As the value of x became small and the transition width ΔT c became narrower, the softening became remarkable. The elastic constants also showed a thermal hysteresis at low temperatures. Relationships between this behaviour and proposed structural and domain changes are discussed.
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On leave from University of Mar del Plata, Argentina.
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Galliano, P.G., Soga, N. & Hirao, K. Elastic anomaly of YBa2Cu3O7−x superconductors containing different oxygen contents. J Mater Sci 27, 2623–2626 (1992). https://doi.org/10.1007/BF00540679
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DOI: https://doi.org/10.1007/BF00540679