Abstract
We study the phase diagram of heavy fermion superconductor UPt3 within a phenomenological model with two nearly degenerate order parameters corresponding to theA 1 andE 1 irreducible representations. A weak effect on superconductivity from the crystal lattice is assumed. This assumption explains a closeness of two critical temperatures and yields parameters of the Ginzburg-Landau functional which lead to a single superconducting transition at pressures above critical: TheH-T diagram with a tetracritical point is recovered in theAE model. Experimental consequences which can distinguish this model from others are also discussed.
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Zhitomirsky, M.E., Ueda, K. Phase diagram of unconventional superconductor UPt3 in weak crystal field model. Czech J Phys 46 (Suppl 2), 555–556 (1996). https://doi.org/10.1007/BF02583585
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DOI: https://doi.org/10.1007/BF02583585