"Intermediate Mixed" State of TypeII Superconductors
Abstract
For magnetic fields in the range (1D)H_{c1}<H<H_{t}, magnetization curves of lowκ typeII PbIn and InBi alloys with nonzero demagnetization coefficients D exhibit a linear dependence of the magnetic moment on applied field. H_{c1} is the lower critical field and H_{t} is the field at which this linear dependence terminates. For finite D, H_{t}<H_{c1}. This behavior can be explained by a model of alternate regions of superconducting and mixed states. This array may be metastable. The mixedstate regions are all presumed to have the same temperaturedependent fluxoidlattice spacing characteristic of H_{c1} when D=0. Thus, as the magnetic field is increased isothermally, the mixedstate regions grow until the whole sample has been converted into the mixed state. This model implies the existence of an attractive interaction between flux lines in lowκ materials.
 Publication:

Physical Review B
 Pub Date:
 April 1971
 DOI:
 10.1103/PhysRevB.3.2231
 Bibcode:
 1971PhRvB...3.2231A