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- W2002040854 abstract "The ground states of Klein-type spin models on the pyrochlore and checkerboard lattice are spanned by the set of singlet dimer coverings and thus possess an extensive ground-state degeneracy. Among the many exotic consequences is the presence of deconfined fractional excitations (spinons), which propagate through the entire system. While a realistic electronic model on the pyrochlore lattice is close to the Klein point, this point is, in fact, inherently unstable because any perturbation $ϵ$ restores spinon confinement at $T=0$. We demonstrate that deconfinement is recovered in the finite-temperature region $ϵ⪡T⪡J$, where the deconfined phase can be characterized as a dilute Coulomb gas of thermally excited spinons. We investigate the zero-temperature phase diagram away from the Klein point by means of a variational approach based on the singlet dimer coverings of the pyrochlore lattices and by taking into account their nonorthogonality. We find that in these systems, nearest-neighbor exchange interactions do not lead to Rokhsar-Kivelson-type processes." @default.
- W2002040854 created "2016-06-24" @default.
- W2002040854 creator A5023678780 @default.
- W2002040854 creator A5064974974 @default.
- W2002040854 creator A5068575160 @default.
- W2002040854 creator A5083751736 @default.
- W2002040854 date "2007-03-09" @default.
- W2002040854 modified "2023-10-11" @default.
- W2002040854 title "High-dimensional fractionalization and spinon deconfinement in pyrochlore antiferromagnets" @default.
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- W2002040854 doi "https://doi.org/10.1103/physrevb.75.094411" @default.
- W2002040854 hasPublicationYear "2007" @default.
- W2002040854 type Work @default.
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