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Abstract:
We discuss how an unconventional superconductor, in zero applied magnetic field, can be subject to
a ``magnetic'' instability if the parameters in the Ginzburg-Landau functional are in the appropriate
range. In the instability, the order parameter distorts and generates a supercurrent; this supercurrent
generates a magnetic field, which then lowers the free energy through its interaction with the order
parameter. We discuss the compatibility of this instability with the fundamental constraints on the
parameters in the free-energy functional.
Paper: [PDF]
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