The measurements of intensity of ultrasonic resonances below the transition to the superconducting state in a tetragonal metal cannot distinguish between the magnetic and nonmagnetic superconducting states with two-component order parameters.
- Pub Date:
- September 2020
- Condensed Matter - Superconductivity
- 1 page The piezo-magnetic term Eq.(4) is not invariant in respect of group D_4(E) Eq.(3). So, piezo-magnetic energy does not exist and play no role in the interpretation of ultrasound experiments