Mean-field RVB ground states of lattice models of CuNCN
Vernadsky National Library of Ukraine
Переглянути архів Інформація| Поле | Співвідношення | |
| Title |
Mean-field RVB ground states of lattice models of CuNCN
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| Creator |
Tchougréeff, A.L.
Dronskowski, R. |
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| Subject |
К восьмидесятилетию антиферромагнетизма I. Теория
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| Description |
Recently we proposed to describe the fascinating physics of copper carbodiimide, CuNCN, with help of the anisotropic trangular antiferromagnetic Heisenberg model with the parameters Ja and Jab extending along the a, and a ± b lattice directions and a new frustrated Heisenberg antiferromagnetic model with exchange parameters Jc, Ja, and Jac, extending along the c, a, and a ± c (c-a-ca model) directions assuming the resonating valence bond (RVB) type of the corresponding phases. Here we discuss possible RVB ground states of these models in the mean-field approximation and show that in either case it is a two-dimensional RVB state. The difference between the models is that in the ground state of the triangular model the quasiparticle spectrum features a finite (although exponentially small) energy gap for arbitrary weak Jab whereas that of the c-a-ca model shows two pseudogaps and a linear dependence of the quasiparticle density of states in the low-energy range.
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| Date |
2017-06-06T18:33:11Z
2017-06-06T18:33:11Z 2014 |
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| Type |
Article
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| Identifier |
Mean-field RVB ground states of lattice models of CuNCN / A.L. Tchougréeff, R. Dronskowski // Физика низких температур. — 2014. — Т. 40, № 1. — С. 92-104 — Бібліогр.: 21 назв. — англ.
0132-6414 75.10.Jm, 75.10.Kt, 75.50.Ee http://dspace.nbuv.gov.ua/handle/123456789/119404 |
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| Language |
en
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| Relation |
Физика низких температур
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| Publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
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