Spin-triplet superconducting pairing due to local (Hund's rule, Dirac) exchange

We discuss general implications of the local spin-triplet pairing among fermions induced by local ferromagnetic exchange, example of which is the Hund's rule coupling. The quasiparticle energy and their wave function are determined for the three principal phases with the gap, which is momentum independent. We utilize the Bogolyubov-Nambu-De Gennes approach, which in the case of triplet pairing in the two-band case leads to the four-components wave function. Both gapless modes and those with an isotropic gap appear in the quasiparticle spectrum. A striking analogy with the Dirac equation is briefly explored. This type of pairing is relevant to relativistic fermions as well, since it reflects the fundamental discrete symmetry-particle interchange. A comparison with the local interband spin-singlet pairing is also made.Comment: 16 pages, LaTex, submitted to Phys. Rev.

Research Review: Family Centres: a review of the literature

This paper provides a review of the literature about family centres and other examples of centre-based practice. The literature reflects a period of some 25 years in which practice has sought to integrate protection, support for families and local development in local centres. The literature shows great descriptive activity in the 1980s, and some Children Act (1989) sponsored studies, particularly of the voluntary sector, in the early 1990s, followed by inactivity before a new and more sophisticated literature emerges in the late 1990s and early 2000. While lacking experimental design, the strengths of the contemporary picture show in the appreciative voice of the user, including those at the very margins; studies of support programmes nurtured by centres; lessons about socially inclusive practice and the melding of formality and informality; theorization about centre-based practice as a containing space; and attempts to understand complexity and synergy and to develop a theory of change. This domain of practice appears to have much to offer the new UK child care strategy and inter-professional context if the opportunity is taken