ULTRASONIC MEASUREMENTS IN MnF2 NEAR THE NEEL TEMPERATURE,

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Abstract:

The ultrasonic velocity has been measured for both longitudinal and transverse waves in the 110 and 001 directions in MnF2 near the critical point. A sharp minimum was observed for longitudinal waves. This minimum coincided with an attenuation maximum and occurred at the Neel temperature. The velocity anomaly was frequency independent for the two frequencies used. No effect was observed for transverse waves. The attenuation was measured over a wide temperature range. The temperature dependence of both critical attenuation and velocity is given by T-T sub N to -0.33 power for T greater than T sub N, where T sub N is the Neel temperature of 67.34K. Author

Author(s):
Leisure, R. G. ; Moss, R. W.
Author Organization(s):
BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH
Pagination:
0026

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DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
D1-82-0902
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*MAGNETIC MATERIALS, PHASE STUDIES), (*MANGANESE COMPOUNDS, *ULTRASONIC RADIATION), FLUORIDES, ULTRASONIC PROPERTIES, ATTENUATION, PROPAGATION, TRANSITION TEMPERATURE, ANOMALIES, ANTIFERROMAGNETISM, MAGNETIC PROPERTIES, POLARIZATION, TEST METHODS, EXPERIMENTAL DATA
Field(s)/Group(s):
Solid State Physics
Keyword(s):
CRITICAL POINT, LONGITUDINAL WAVES, *MANGANESE FLUORIDE, NEEL TEMPERATURE, TETRAGONAL LATTICES, TRANSVERSE WAVES, ATTENUATION, ULTRASONICS
Report Date:
1969 Aug 01