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Spin-liquid states in a copper-based material: the mysterious quantum phase CuNCNстатья
- Авторы: Tchougréeff A.L., Dronskowski R.
- Журнал: Quantum Matter
- Том: 4
- Номер: 1
- Год издания: 2015
- Первая страница: 63
- Последняя страница: 68
- DOI: 10.1166/qm.2014.1172
- Аннотация: We review the many-body nature of the quantum material copper carbodiimide, CuNCN, which exhibits seemingly contradictive physical properties such as a local Cu(II)–N coordination conforming to a 1 st order Jahn–Teller effect, the total absence of magnetic neutron scattering and a fairly complex temperature de- pendence of its magnetic susceptibility indicating both Pauli- and Arrhenius-like regimes. It is shown that a many-body spin-liquid (or resonating valence bond, RVB) approach for modelling the frustrated antiferro- magnetic interactions in CuNCN not only allows for a vivid physicochemical picture of the compound but also predicts three RVB states differing in their dimensionalities as a function of the temperature. In addi- tion, RVB theory semi-quantitatively describes subtle (and even paradoxical) structural effects in the lattice parameters close to absolute zero temperature. The alternative spin-Peierls model of CuNCN, however, is in conflict with the physical nature of the material.
- Добавил в систему: Чугреев Андрей Львович