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Shear-modulus change below Tc in YBa2Cu3O7−x
Published online by Cambridge University Press: 31 January 2011
Abstract
The ultrasonic transverse-wave velocity in the high-Tc metal-oxide superconductor YBa2Cu3O7−x between 275 and 4 K was measured. Above Tc the velocity shows normal behavior: during cooling, it displays a monotonic increase with decreasing slope. During cooling below Tc the shear modulus departs from normal behavior, increasing as ΔG /G = b [1 − (T/Tc)n, where n = 3. These results depart dramatically from those expected for a simple second-order normal-superconducting phase transition.
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