科研之友
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摘要
The physical properties of RuSr2GdCu2O8 have been investigated by ultrasonic measurements. The huge stiffening of the velocity and the sharp elastic energy loss peak with the asymmetric shape near 220 K both indicate a phase transformation in the sample, which is induced by the disorder to order transformation of the orientation of RuO6 octahedra. The softening of the velocity and the elastic energy loss peak near 132 K may give further evidence to the strong spin-phonon interaction in the compound, and suggest a complex interplay of spin and lattice degrees of freedom in RuSr2GdCu2O8. A velocity jump and a decrease of the elastic energy loss are observed around the onset of the superconducting transition temperature T-C,T-onset similar to 50 K.
