Sound velocity and attenuation in nuclear-ordered U2D2 solid 3He
Abstract
We studied sound properties of nuclear-ordered U2D2 solid 3He crystal with a single magnetic domain along the melting curve. We measured temperature dependences of sound velocities and attenuations for a longitudinal and two transverse sounds between the sound frequency f, 3 and 50 MHz below the nuclear-ordered transition temperature TN. The sound velocity v changes as Δ v/ v= a( T/ TN) 4 and the attenuation α approximately as Δ α= cf3( T/ TN) 9. The coefficients a and c depend on crystal orientations and sound modes. Assuming the tetragonal symmetry of U2D2 crystal, we determined six independent elastic constants of nuclear spin system from Δ v/ v.
- Publication:
-
Physica B Condensed Matter
- Pub Date:
- May 2003
- DOI:
- 10.1016/S0921-4526(02)02122-1
- Bibcode:
- 2003PhyB..329..375Y
- Keywords:
-
- Solid 3He;
- Ultrasound;
- Nuclear magnetism;
- U2D2 solid