= Unconventional superconductor
An unconventional superconductor realizes <unconventional superconductivity>: its pairing cannot be described by the simple conventional isotropic spin-singlet model. The precise usage should be stated, since unconventional gap symmetry and an unconventional microscopic pairing mechanism are different claims.
A <d-wave superconductor> supplies a concrete example. Its <superconducting gap function> changes sign with momentum direction and can vanish at nodes, permitting low-energy <Bogoliubov quasiparticles>. <Nodal quasiparticle power laws> probe those excitations, while a <phase-sensitive test of d-wave pairing> probes the relative gap signs. An unusual <superconducting transition temperature> alone does not establish a particular pairing symmetry, and a real d-wave gap does not automatically imply broken <time reversal>.
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