Frustrated Heisenberg antiferromagnet on the pyrochlore lattice
Copyright policy )Frustrated Heisenberg antiferromagnet on the pyrochlore lattice
We investigate quantum phase transitions for the $s=1/2$ antiferromagnetic Heisenberg model on a pyrochlore lattice. By means of a series expansion starting from isolated tetrahedra, the ground-state phase diagram is determined. When the ratio of the two competing exchange couplings is varied, the first-order (second-order) quantum phase transition occurs between the two spin gap phases (the spin-gap and the antiferromagnetic phases). We also discuss some properties expected for the s=1 pyrochlore spin system.
4 pages, 4 figures
- Institute of Science Tokyo Japan
- Osaka University Japan
Condensed Matter - Strongly Correlated Electrons, Strongly Correlated Electrons (cond-mat.str-el), 500, FOS: Physical sciences, 530
Condensed Matter - Strongly Correlated Electrons, Strongly Correlated Electrons (cond-mat.str-el), 500, FOS: Physical sciences, 530
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