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VOLUME 58 (1993) | ISSUE 3 | PAGE 220
Collective order-parameter modes in superconducting UPt3
The spectrum of collective modes in the limit q = 0 in superconducting UPt3 is calculated in the model of />-wave pairing proposed by Machida and Ozaki [Phys. Rev. Lett. 66, 3293 (1991)]. A Lagrangian formulation of the Ginzburg-Landau theory is used. In a zero field the spectrum consists of (1) four modes at temperatures T<Tc2 and (2) two doublets and one singlet at Tci>T> Tc2■