title: Spin-dependent acoustic response in the nonunitary A1 and A2 phases of superfluid 3He under high magnetic fields.
abstract: The transverse acoustic impedance of superfluid ^{3}He was measured in the A1 and A2 phases up to 13 T to investigate the surface states in nonunitary superfluids. The temperature dependence of the impedance was much larger in the A1 phase than in the A2 phase. This nonsymmetric behavior indicates that momentum exchange with walls for spin-down surface states is quite different from that for spin-up surface states. The spin-dependent response might be a reflection of an essential feature of the nonunitary states where gap amplitudes depend on spin states. Weak-coupling theories ignore any spin-dependent processes and do not account for the nonsymmetric behavior.
authors: Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan.
authors: S
authors: S
authors: Murakawa
authors: Institute for Solid State Physics, University of Tokyo, Chiba 277-8581, Japan.
authors: A
authors: A
authors: Yamaguchi
authors: Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan.
authors: M
authors: M
authors: Arai
authors: Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan.
authors: M
authors: M
authors: Wasai
authors: Institute for Solid State Physics, University of Tokyo, Chiba 277-8581, Japan.
authors: Y
authors: Y
authors: Aoki
authors: Institute for Solid State Physics, University of Tokyo, Chiba 277-8581, Japan.
authors: H
authors: H
authors: Ishimoto
authors: Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan.
authors: R
authors: R
authors: Nomura
authors: Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan.
authors: Y
authors: Y
authors: Okuda
authors: Graduate School of Integrated Arts and Sciences, Hiroshima University, Hiroshima 739-8521, Japan.
authors: Y
authors: Y
authors: Nagato
authors: Graduate School of Integrated Arts and Sciences, Hiroshima University, Hiroshima 739-8521, Japan.
authors: S
authors: S
authors: Higashitani
authors: Graduate School of Integrated Arts and Sciences, Hiroshima University, Hiroshima 739-8521, Japan.
authors: K
authors: K
authors: Nagai