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Accueil du site > Publications > Publications 2009 > Supersolid phases of a doped valence-bond quantum antiferromagnet : Evidence for a coexisting superconducting order parameter

Supersolid phases of a doped valence-bond quantum antiferromagnet : Evidence for a coexisting superconducting order parameter

Marcin Raczkowski and Didier Poilblanc

par Didier Poilblanc - 7 octobre 2008

A renormalized mean-field theory of a doped quantum antiferromagnet on the frustrated checkerboard lattice, a two-dimensional analog of the pyrochlore lattice, reveals the existence of novel fermionic supersolid phases originating from the parent valence bond crystal (VBC) Mott insulator that breaks lattice translation symmetry. Remarkably such phases of matter are characterized by a finite pairing amplitude (possibly in different orbital symmetry channels) and hence by a superconducting order parameter which coexists with the underlying VBC. The resemblance with modulated superconducting patterns in high-Tc cuprates is discussed as well as possible relevance to frustrated noncuprate superconductors such as spinels and pyrochlores.