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Your search keyword '"C. Hucho"' showing total 2 results
Start Over Author "C. Hucho" Journal 1995 ieee ultrasonics symposium. proceedings. an international symposium
2 results on '"C. Hucho"'

1. Surface acoustic wave investigation of mixed-state phases in YBa/sub 2/Cu/sub 3/O/sub 7

Author

C. Hucho, J. Feller, M. Levy, R. Gaffney, M. J. McKenna, and B.K. Sarma

Subjects
Materials science, Flux pinning, High-temperature superconductivity, Condensed matter physics, Surface acoustic wave, Acoustic wave, Yttrium barium copper oxide, Granular material, Piezoelectricity, law.invention, Vortex, Condensed Matter::Materials Science, chemistry.chemical_compound, chemistry, law, Condensed Matter::Superconductivity
Abstract

A technique was developed which allows for surface acoustic wave (SAW) experiments up to 500 MHz in YBCO single crystals and films on piezoelectric as well as non-piezoelectric substrates. Experimental data on a granular YBCO film show a field dependent attenuation peak below T/sub c/ which is indicative of temperature dependent changes of the coupling of the magnetic vortex system to the crystal lattice and might be related to melting or depinning of the vortex lattice.

Published
2002
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2. Ultrasonic studies of superconducting and magnetic transitions in a La/sub 2-x/Sr/sub x/CuO/sub 4/ single crystal

Author

Hong Zhang, K. Kitazawa, B.K. Sarma, C. Hucho, M. Levy, T. Kimura, M. J. McKenna, and K. Kishio

Subjects
Superconductivity, High-temperature superconductivity, Materials science, Condensed matter physics, law, Attenuation, Ultrasonic sensor, Crystal structure, Single crystal, Instability, Magnetic transitions, law.invention
Abstract

Ultrasonic attenuation and sound velocity were measured at frequencies ranging from 25 MHz to 305 MHz in a large single crystal of La/sub 2-x/Sr/sub x/CuO/sub 4/ with nominal x of about 0.15. The observed features in attenuation and velocity suggest a relaxation process of magnetic origin at about 27 K, and those at /spl sim/37.9 K originate in the superconducting transition and a possible structural instability slightly above it.

Published
2002
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