Kagome antiferromagnet : a Schwinger-boson mean-field theory study
The Heisenberg antiferromagnet on the kagome lattice is studied in the framework of Schwinger-boson mean-field theory. Two solutions with different symmetries are presented. One solution gives a conventional quantum state with q=0 order f...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2011
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| Online Access: | https://hdl.handle.net/10356/91718 http://hdl.handle.net/10220/6908 |
| _version_ | 1826128561138827264 |
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| author | Li, Peng Su, Haibin Shen, Shun-Qing |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Li, Peng Su, Haibin Shen, Shun-Qing |
| author_sort | Li, Peng |
| collection | NTU |
| description | The Heisenberg antiferromagnet on the kagome lattice is studied in the framework of Schwinger-boson
mean-field theory. Two solutions with different symmetries are presented. One solution gives a conventional
quantum state with q=0 order for all spin values. Another gives a gapped spin liquid state for spin S= 1/2 and a
mixed state with both q=0 and √3 × √3 orders for spin S > 1/2 . We emphasize that the mixed state exhibits two
sets of peaks in the static spin structure factor. For the case of spin S= 1/2 , the gap value we obtained is
consistent with the previous numerical calculations by other means. We also discuss the thermodynamic
quantities such as the specific heat and magnetic susceptibility at low temperatures and show that our result is
in a good agreement with the Mermin-Wagner theorem. |
| first_indexed | 2024-10-01T07:26:36Z |
| format | Journal Article |
| id | ntu-10356/91718 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:26:36Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | ntu-10356/917182023-07-14T15:44:48Z Kagome antiferromagnet : a Schwinger-boson mean-field theory study Li, Peng Su, Haibin Shen, Shun-Qing School of Materials Science & Engineering DRNTU::Science::Physics::Atomic physics::Solid state physics The Heisenberg antiferromagnet on the kagome lattice is studied in the framework of Schwinger-boson mean-field theory. Two solutions with different symmetries are presented. One solution gives a conventional quantum state with q=0 order for all spin values. Another gives a gapped spin liquid state for spin S= 1/2 and a mixed state with both q=0 and √3 × √3 orders for spin S > 1/2 . We emphasize that the mixed state exhibits two sets of peaks in the static spin structure factor. For the case of spin S= 1/2 , the gap value we obtained is consistent with the previous numerical calculations by other means. We also discuss the thermodynamic quantities such as the specific heat and magnetic susceptibility at low temperatures and show that our result is in a good agreement with the Mermin-Wagner theorem. Published version 2011-07-14T07:12:05Z 2019-12-06T18:10:43Z 2011-07-14T07:12:05Z 2019-12-06T18:10:43Z 2007 2007 Journal Article Li, P., Su, H. & Shen, S.-Q. (2007). Kagome antiferromagnet : a Schwinger-boson mean-field theory study. Physical review B, 76. https://hdl.handle.net/10356/91718 http://hdl.handle.net/10220/6908 10.1103/PhysRevB.76.174406 en Physical review B © 2007 American Physical Society. This paper was published in Physical Review B and is made available as an electronic reprint (preprint) with permission of American Physical Society. The paper can be found at: [DOI: http://dx.doi.org/10.1103/PhysRevB.76.174406]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. 7 p. application/pdf |
| spellingShingle | DRNTU::Science::Physics::Atomic physics::Solid state physics Li, Peng Su, Haibin Shen, Shun-Qing Kagome antiferromagnet : a Schwinger-boson mean-field theory study |
| title | Kagome antiferromagnet : a Schwinger-boson mean-field theory study |
| title_full | Kagome antiferromagnet : a Schwinger-boson mean-field theory study |
| title_fullStr | Kagome antiferromagnet : a Schwinger-boson mean-field theory study |
| title_full_unstemmed | Kagome antiferromagnet : a Schwinger-boson mean-field theory study |
| title_short | Kagome antiferromagnet : a Schwinger-boson mean-field theory study |
| title_sort | kagome antiferromagnet a schwinger boson mean field theory study |
| topic | DRNTU::Science::Physics::Atomic physics::Solid state physics |
| url | https://hdl.handle.net/10356/91718 http://hdl.handle.net/10220/6908 |
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