Elastic properties of polycrystalline La2-xSrxCuO4

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Abstract

We report on the temperature dependence of the shear (G) and Young's (E) moduli of polycrystalline La1.85Sr0.15CuO4 and La2CuO4. We find that E∼3G, implying that the single crystal shear moduli are small, so that the polycrystalline E and G are determined by the single crystal shear moduli only. Contrary to expectations, there are large, but sample dependent, drops in moduli at Tc for the superconducting Sr-alloy. The large shear softening associated with the tetragonal-orthorhombic transition at 180K is also very sample dependent, and does not appear simply related to the superconducting transition. The polycrystalline elastic moduli are very hysteretic below the structural transition, presumably due to the distortion driven variation in crystalline dimensions with temperature.

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