Structural behavior of the kagome antiferromagnet TmBaCo4O7: Neutron diffraction study and group-theoretical consideration
The first-order structural phase transition at TS ∼240 K in the extended kagome antiferromagnet TmBaCo4O7 has been studied by neutron powder diffraction. In order to comprehend the microscopic origin of the transition, a detailed symmetry analysis is performed, based on crystallographic parameters o...
| Glavni autori: | , , , , |
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| Format: | Journal article |
| Jezik: | English |
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2009
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| _version_ | 1826277569987608576 |
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| author | Khalyavin, D Chapon, L Radaelli, P Zheng, H Mitchell, J |
| author_facet | Khalyavin, D Chapon, L Radaelli, P Zheng, H Mitchell, J |
| author_sort | Khalyavin, D |
| collection | OXFORD |
| description | The first-order structural phase transition at TS ∼240 K in the extended kagome antiferromagnet TmBaCo4O7 has been studied by neutron powder diffraction. In order to comprehend the microscopic origin of the transition, a detailed symmetry analysis is performed, based on crystallographic parameters obtained by Rietveld analysis of the neutron data. The results are consistent with the P31c→Pna 21 symmetry lowering and support a displacive nature of the phase transition. The complex tilting pattern of CoO4 tetrahedra in both triangular and kagome sublattices is described based on symmetry-adapted pseudovector distortion modes of the parent P 63mc hexagonal structure. Our analysis reveals that the unusual topology of the crystal structure does not allow CoO4 tetrahedra to rotate as rigid units, resulting in their inevitable distortions, whatever the combination of rotational modes considered. A possible analogy between polyhedral distortions and spin frustration in this system is discussed. © 2009 The American Physical Society. |
| first_indexed | 2024-03-06T23:30:53Z |
| format | Journal article |
| id | oxford-uuid:6bfbcafb-2d04-4763-952a-f9f281f8746f |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T23:30:53Z |
| publishDate | 2009 |
| record_format | dspace |
| spelling | oxford-uuid:6bfbcafb-2d04-4763-952a-f9f281f8746f2022-03-26T19:07:48ZStructural behavior of the kagome antiferromagnet TmBaCo4O7: Neutron diffraction study and group-theoretical considerationJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:6bfbcafb-2d04-4763-952a-f9f281f8746fEnglishSymplectic Elements at Oxford2009Khalyavin, DChapon, LRadaelli, PZheng, HMitchell, JThe first-order structural phase transition at TS ∼240 K in the extended kagome antiferromagnet TmBaCo4O7 has been studied by neutron powder diffraction. In order to comprehend the microscopic origin of the transition, a detailed symmetry analysis is performed, based on crystallographic parameters obtained by Rietveld analysis of the neutron data. The results are consistent with the P31c→Pna 21 symmetry lowering and support a displacive nature of the phase transition. The complex tilting pattern of CoO4 tetrahedra in both triangular and kagome sublattices is described based on symmetry-adapted pseudovector distortion modes of the parent P 63mc hexagonal structure. Our analysis reveals that the unusual topology of the crystal structure does not allow CoO4 tetrahedra to rotate as rigid units, resulting in their inevitable distortions, whatever the combination of rotational modes considered. A possible analogy between polyhedral distortions and spin frustration in this system is discussed. © 2009 The American Physical Society. |
| spellingShingle | Khalyavin, D Chapon, L Radaelli, P Zheng, H Mitchell, J Structural behavior of the kagome antiferromagnet TmBaCo4O7: Neutron diffraction study and group-theoretical consideration |
| title | Structural behavior of the kagome antiferromagnet TmBaCo4O7: Neutron diffraction study and group-theoretical consideration |
| title_full | Structural behavior of the kagome antiferromagnet TmBaCo4O7: Neutron diffraction study and group-theoretical consideration |
| title_fullStr | Structural behavior of the kagome antiferromagnet TmBaCo4O7: Neutron diffraction study and group-theoretical consideration |
| title_full_unstemmed | Structural behavior of the kagome antiferromagnet TmBaCo4O7: Neutron diffraction study and group-theoretical consideration |
| title_short | Structural behavior of the kagome antiferromagnet TmBaCo4O7: Neutron diffraction study and group-theoretical consideration |
| title_sort | structural behavior of the kagome antiferromagnet tmbaco4o7 neutron diffraction study and group theoretical consideration |
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