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Ultrasound studies of single crystal thulium in an applied magnetic field
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UNSPECIFIED (2001) Ultrasound studies of single crystal thulium in an applied magnetic field. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 234 (3). pp. 387-394. ISSN 0304-8853.
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Abstract
The paper reports the first measurements of the single crystal elastic constants of the heavy rare earth metal thulium as a function of temperature and magnetic field. The constants were obtained from ultrasonic velocity measurements over a temperature range of 4.2-296 K and in applied magnetic fields of up to 5 T. The elastic constants; C-11, C-33, C-44 and C-66 = (C-11-C-12)/2 were determined from the ultrasonic velocities. Anomalies in the elastic constants were observed at 58 K from the c-axis propagated shear wave measurements and at 55 K from the c-axis propagated longitudinal wave measurements. Significant softening of the elastic constants C-33 and C-44 was observed close to T-N. Application of a magnetic field (> 2T) along the c-axis direction induced further softening of the material. Electromagnetic acoustic transducers (EMATs) were also employed in addition to conventional piezoelectric quartz transducers. A marked increase in the EMATs acoustic coupling efficiency (generation and detection efficiency) occurred close to T-N. (C) 2001 Elsevier Science B.V. All rights reserved.
Item Type: | Journal Article | ||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) Q Science > QC Physics |
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Journal or Publication Title: | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | ||||
Publisher: | ELSEVIER SCIENCE BV | ||||
ISSN: | 0304-8853 | ||||
Official Date: | September 2001 | ||||
Dates: |
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Volume: | 234 | ||||
Number: | 3 | ||||
Number of Pages: | 8 | ||||
Page Range: | pp. 387-394 | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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