Abstract
Ultrasound velocity measurements based on a phase comparison method for four different modes have been done on a copper-free layered perovskite superconductor Sr 2 RuO 4 with T c = 1.2 K. Anomalous softening is observed in the longitudinal C 11 and C 33 modes below 108 K, which is attributed to the coupling of the electronic states to the strain with Γ 1 representation in the tetragonal point group D 4h . The discontinuous change of the slope in C 11 and C 33 at T c is basically explained by the second-order strain dependence of T c , ∂ 2 T c /∂e 2 uk . From the initial slope of the upper critical field H c2 , the anisotropy ratio in the coherence length is found to be 28, in agreement with previous ac susceptibility measurements. Acoustic de Haas-van Alphen oscillations for the cylindrical α-Fermi surface with 3.2 m 0 are observed in C 33 as a function of the magnetic field applied perpendicular to the Q2D conducting plane. The area coefficient is evaluated to be ∣Λ zz ∣ = 20±5 from the Kataoka-Goto mode...
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