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APS » Journals » Phys. Rev. Lett. » Volume 95 » Issue 7
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Phys. Rev. Lett. 95, 075301 (2005) [4 pages]

Observation of Surface Andreev Bound States of Superfluid 3He by Transverse Acoustic Impedance Measurements

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Y. Aoki, Y. Wada, M. Saitoh, R. Nomura, and Y. Okuda
Department of Condensed Matter Physics, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro, Tokyo 152-8551, Japan

Y. Nagato1, M. Yamamoto2, S. Higashitani2, and K. Nagai2
1Information Media Center, Hiroshima University, 1-7-1 Kagamiyama, Higashi-hiroshima 739-8521, Japan
2Faculty of Integrated Arts and Sciences, Hiroshima University, 1-7-1 Kagamiyama, Higashi-hiroshima 739-8521, Japan

Received 12 January 2005; published 8 August 2005

Complex transverse acoustic impedance of the superfluid 3He-B was measured at the frequencies of 10 to 80 MHz at 17.0 bar by a cw bridge method. The observed temperature dependence was well explained by the quasiclassical theory with random S-matrix model for a diffusive surface. The temperature dependence was influenced by pair breaking and by quasiparticle density of states at the surface, which was drastically modified from the bulk one by the presence of surface Andreev bound states.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.075301
DOI:
10.1103/PhysRevLett.95.075301
PACS:
67.57.Np, 43.58.+z, 74.45.+c
 
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