Effect of Gap Distortion on the Field Splitting of Collective Modes in Superfluid <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">He</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>3</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span>-<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>B</mi></math></span>

N. Schopohl; M. Warnke; L. Tewordt

doi:10.1103/PhysRevLett.50.1066

Effect of Gap Distortion on the Field Splitting of Collective Modes in Superfluid ${}^{3}{He}$ - $B$

N. Schopohl, M. Warnke, and L. Tewordt

Phys. Rev. Lett. 50, 1066 – Published 4 April 1983

Abstract

The field splitting of the real squashing, $J = 2$ , mode in ${}^{3}{He}$ - $B$ is shown to become highly nonlinear at large fields as a result of the ellipsoidal deformation of the energy gap. This leads to crossings of the $J_{z} = + 1$ and $J_{z} = 0$ levels with the $J_{z} = + 2$ level. The crossing points depend sensitively on the couplings between the $J = 2, 1, and 0$ modes. The theory is in good agreement with the observed field evolution and level crossing as measured recently by Shivaram et al.