Ultrasonic measurements in superconducting UPt3 | Zendy

S. Adenwalla | Zendy; S.-W. Lin | Zendy; Zhibo Zhao | Zendy; J. B. Ketterson | Zendy; M. Levy | Zendy; Bimal K. Sarma | Zendy

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Ultrasonic measurements in superconducting UPt3

Author(s) -

S. Adenwalla,

S.-W. Lin,

Zhibo Zhao,

J. B. Ketterson,

M. Levy,

Bimal K. Sarma

Publication year - 1992

Publication title -

the journal of the acoustical society of america

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.619

H-Index - 187

eISSN - 1520-8524

pISSN - 0001-4966

DOI - 10.1121/1.404810

Subject(s) - superconductivity , condensed matter physics , ultrasonic sensor , work (physics) , jump , phase (matter) , materials science , physics , ultrasonic attenuation , thermodynamics , quantum mechanics , acoustics

Ultrasonic measurements on the heavy fermion superconductors have proved a useful tool in elucidating the nature of the superconducting state. Earlier measurements of sound attenuation in superconducting UPt3 showed power‐law temperature dependences (rather than an exponential temperature dependence as expected for a BCS type superconductor), indicating the presence of nodes in the gap. Subsequent ultrasonic measurements have shown indications of phase transitions within the superconducting state. In particular, these ultrasonic velocity measurements show the presence of three superconducting phases in the mixed state. The size of the velocity jump can be related to the heat capacity jump. Further, using a thermodynamic analysis it is possible to deduce the order of the phase transition lines. [Work at NU supported by NSF, and the work at UWM supported by ONR.]

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