ULTRASONIC ATTENUATION FROM DISLOCATIONS IN A MAGNETIC FIELD

The phase propagation in superconducting aluminum has been studied by measuring the time rate of change of ultrasonic attenuation. The time taken for the destruction of the superconducting phase in a cylindrical specimen, by means of a magnetic field, H, greater than the critical field, Hc, is approximately proportional to{H/(H–Hc)} in agreement with eddy-current theory. In the converse case, where the superconducting phase is restored by switching off the magnetic field H (>Hc), the total time taken is nearly independent of the temperature (or Hc) as well as H. The superconducting phase grows at a non-uniform volume rate which is considerably less than the uniform rate of collapse.

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Dependence of Ultrasonic Attenuation in Ferromagnetic Metals on Temperature and Magnetic Field Intensity

IEEE Transactions on Sonics and Ultrasonics ◽

10.1109/t-su.1967.29402 ◽

1967 ◽

Vol 14 (1) ◽

pp. 1-3 ◽

Cited By ~ 6

Author(s):

V.F. Taborov ◽

V.F. Tarasov

Keyword(s):

Magnetic Field ◽

Field Intensity ◽

Magnetic Field Intensity ◽

Ultrasonic Attenuation ◽

Ferromagnetic Metals

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Effect of magnetic field on ultrasonic attenuation in nickel single crystals

Journal of Magnetism and Magnetic Materials ◽

10.1016/0304-8853(89)90059-0 ◽

1989 ◽

Vol 82 (1) ◽

pp. 33-42

Author(s):

A. Zielinski ◽

G. Dietz ◽

C. Becker ◽

D. Lenz ◽

K. Lücke

Keyword(s):

Magnetic Field ◽

Single Crystals ◽

Ultrasonic Attenuation

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Ultrasonic attenuation in lead

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1963.0006 ◽

1963 ◽

Vol 271 (1344) ◽

pp. 88-104 ◽

Cited By ~ 10

Keyword(s):

Magnetic Field ◽

Ultrasonic Attenuation ◽

Absolute Magnitude ◽

Transverse Magnetic ◽

Ultrasonic Waves ◽

Acoustic Oscillations ◽

Connected Surface ◽

Sample Orientation ◽

Longitudinal Ultrasonic Waves

The absorption of longitudinal ultrasonic waves has been studied as a function of transverse magnetic field in pure single crystals of lead at 1.2 °K. The results were found to be generally consistent with the Fermi surface of lead suggested by Gold. In particular a detailed study of the magneto-acoustic oscillations, as a function of sample orientation and field direction, allowed the determination of some of the dimensions of the hole surface in the second Brillouin zone and revealed a number of new electronic orbits on the multiply-connected surface in the third zone. The absolute magnitude of the attenuation and its dependence on propagation direction and on magnetic field was studied and the results interpreted in terms of the general theory of ultrasonic absorption.

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