Anomalous shear ultrasonic attenuation peak at 95.5°K in holmium2 |
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Authors: | MC Lee RA Treder M Levy |
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Institution: | Department of Physics, University of Wisconsin-Milwaukee, Milwaukee, WI53201, U.S.A. |
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Abstract: | An anomalous attenuation peak at 95.5°K has been observed for shear ultrasonic waves transmitted along the c-axis of two holmium single crystals. The velocity change across this temperature is on the order of 10?4. In the presence of an external magnetic field, the peak moves toward high temperatures for both H∥a and H∥c. A rotation of the field in the basal plane produces a two-fold symmetry pattern in the attenuation. A double peak structure centered at the c-plane has also been observed when the field is rotated away from the a-axis. A considerable fraction of the attenuation peak appears to go as sin2 θ where θ is the angle between the shear wave polarization and the external field. |
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