Physics – Condensed Matter – Superconductivity
Scientific paper
2002-07-31
Il Nuovo Cimento D - Cond. Matt. At., 15(1) (1993), p. 59
Physics
Condensed Matter
Superconductivity
7 pages, 4 figures, Enhanced and english corrected version of the 1993 published one
Scientific paper
A connection between creation of toroidal moments and breaking of the relativistic crystalline group associated to a given crystal, is presented in this paper. Indeed, if magnetoelectric effects exist, the interaction between electrons and elementary magnetic cells appears in such a way that the resulting local polarization and magnetization break the local relativistic crystalline symmetry. Therefore, Goldstone bosons, also associated to toroidal moments, are created and, as a consequence, corresponding toroidal phases in crystals. The list of the Shubnikov groups compatible with this kind of phases is given and possible consequences in superconductor theory in magnetoelectric crystals are examined.
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