Mean-field RVB ground states of lattice models of CuNCN
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...
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| Veröffentlicht in: | Физика низких температур |
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| Datum: | 2014 |
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| Format: | Artikel |
| Sprache: | Englisch |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2014
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| Online Zugang: | https://nasplib.isofts.kiev.ua/handle/123456789/119404 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | 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. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862730786261696512 |
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| author | Tchougréeff, A.L. Dronskowski, R. |
| author_facet | Tchougréeff, A.L. Dronskowski, R. |
| citation_txt | 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. |
| collection | DSpace DC |
| container_title | Физика низких температур |
| 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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| first_indexed | 2025-12-07T19:22:16Z |
| format | Article |
| fulltext | |
| id | nasplib_isofts_kiev_ua-123456789-119404 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-12-07T19:22:16Z |
| publishDate | 2014 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | Tchougréeff, A.L. Dronskowski, R. 2017-06-06T18:33:11Z 2017-06-06T18:33:11Z 2014 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 https://nasplib.isofts.kiev.ua/handle/123456789/119404 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. This work has been performed with the support of DFG. Discussion with Prof. V.Ya. Krivnov and Dr. D. Dmitriev is acknowledged. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур К восьмидесятилетию антиферромагнетизма I. Теория Mean-field RVB ground states of lattice models of CuNCN Article published earlier |
| spellingShingle | Mean-field RVB ground states of lattice models of CuNCN Tchougréeff, A.L. Dronskowski, R. К восьмидесятилетию антиферромагнетизма I. Теория |
| title | Mean-field RVB ground states of lattice models of CuNCN |
| title_full | Mean-field RVB ground states of lattice models of CuNCN |
| title_fullStr | Mean-field RVB ground states of lattice models of CuNCN |
| title_full_unstemmed | Mean-field RVB ground states of lattice models of CuNCN |
| title_short | Mean-field RVB ground states of lattice models of CuNCN |
| title_sort | mean-field rvb ground states of lattice models of cuncn |
| topic | К восьмидесятилетию антиферромагнетизма I. Теория |
| topic_facet | К восьмидесятилетию антиферромагнетизма I. Теория |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/119404 |
| work_keys_str_mv | AT tchougreeffal meanfieldrvbgroundstatesoflatticemodelsofcuncn AT dronskowskir meanfieldrvbgroundstatesoflatticemodelsofcuncn |