Magnetic Properties of the Charged Anderson-Brinkman-Morel State: Absence of Hc1
Magnetic properties of the charged Anderson-Brinkman-Morel (ABM) state are investigated theoretically as a special case of time-reversal-symmetry- breaking (T-symmetry breaking) superconductivity, the possibility of which is discussed in heavy-fermion and high T c superconductors [l]-. In the ABM state there are two sources of current: the one from the supercurrent j s(r) and that from the moment l(r) due to the internal motion of Cooper pairs. In zero external field, the field h m(r) from l(r) is screened almost completely by j s(r), as expected, with l(r) changing gradually towards the surface and j s(r) flowing over the bulk. This means that the system as a whole is a nonsingular vortex. As for the magnetization process, the lattice of nonsingular vortices grows from the infinitesimal external field without H c1, subsequently followed by the first-order transition to the lattice with singular cores. Finally, the transition to the normal state occurs at H c 2 which is enhanced over that of the conventional type-II superconductor due to the field l.
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- T. Kita, to appear in Phys. Rev. B42.Google Scholar