“Soft” Anharmonic Vortex Glass in Ferromagnetic Superconductors
“Soft” Anharmonic Vortex Glass in Ferromagnetic Superconductors
Ferromagnetic order in superconductors can induce a spontaneous vortex (SV) state. For external field $\mathbf{H}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0$, rotational symmetry guarantees a vanishing tilt modulus of the SV solid, leading to drastically different behavior than that of a conventional, external-field-induced vortex solid. We show that quenched disorder and anharmoinc effects lead to elastic …