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- W2530932607 abstract "The zero-temp. phase transitions of a spin-half Heisenberg system on the square lattice were evaluated using the coupled cluster method (CCM). Quantum fluctuations along with competition without frustration destroyed Neel long-range order by local singlet format, indicating pure quantum effect and have no classical counterpart. The control parameter is the strength of the competition and the breakdown of Neel ordering is accompanied by the opening of a spin gap. in which CCM described both the order parameter and the gap satisfactorily. Competition due to frustration was found to give more complex magnetic properties. The CCM provides a consistent description of collinear, noncollinear and disordered phases of the quantum spin-half model. A strong impact of quantum fluctuations on the nature of the collinear-noncollinear transition was obsd., and quantum fluctuations may change the second-order classical transition to a first-order quantum transition. [on SciFinder (R)]" @default.
- W2530932607 created "2016-10-21" @default.
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- W2530932607 date "2003-01-01" @default.
- W2530932607 modified "2023-09-25" @default.
- W2530932607 title "Quantum phase transitions in spin-lattice systems with and without frustration." @default.
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