Incommensurate magnetism in the coupled spin tetrahedra system Cu₂Te₂O₅Cl₂
Neutron scattering studies on powder and single crystals have provided new evidences for unconventional
 magnetism in Cu₂Te₂O₅Cl₂. The compound is built from tetrahedral clusters of S = 1/2
 Cu²⁺ spins located on a tetragonal lattice. Magnetic ordering, emerging at TN = 18.2 K, leads...
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| Veröffentlicht in: | Физика низких температур |
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| Datum: | 2005 |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2005
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Incommensurate magnetism in the coupled spin tetrahedra system Cu₂Te₂O₅Cl₂ / O. Zaharko, H.M. Ronnow, A. Daoud-Aladine, S. Streule, F. Juranyi,
 J. Mesot, H. Berger, P.J. Brown // Физика низких температур. — 2005. — Т. 31, № 8-9. — С. 1068-1072. — Бібліогр.: 17 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862533753845317632 |
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| author | Zaharko, O. Ronnow, H.M. Daoud-Aladine, A. Streule, S. Juranyi, F. Mesot, J. Berger, H. Brown, P.J. |
| author_facet | Zaharko, O. Ronnow, H.M. Daoud-Aladine, A. Streule, S. Juranyi, F. Mesot, J. Berger, H. Brown, P.J. |
| citation_txt | Incommensurate magnetism in the coupled spin tetrahedra system Cu₂Te₂O₅Cl₂ / O. Zaharko, H.M. Ronnow, A. Daoud-Aladine, S. Streule, F. Juranyi,
 J. Mesot, H. Berger, P.J. Brown // Физика низких температур. — 2005. — Т. 31, № 8-9. — С. 1068-1072. — Бібліогр.: 17 назв. — англ. |
| collection | DSpace DC |
| container_title | Физика низких температур |
| description | Neutron scattering studies on powder and single crystals have provided new evidences for unconventional
magnetism in Cu₂Te₂O₅Cl₂. The compound is built from tetrahedral clusters of S = 1/2
Cu²⁺ spins located on a tetragonal lattice. Magnetic ordering, emerging at TN = 18.2 K, leads to a
very complex multi-domain, most likely degenerate, ground state, which is characterized by an incommensurate
(ICM) wave vector k ~ [0.15, 0.42, 1/2]. The Cu²⁺ ions carry a magnetic moment
of 0.67(1) μB/Cu²⁺ at 1.5 K and form a four helices spin arrangement with two canted pairs
within the tetrahedra. A domain redistribution is observed when a magnetic field is applied in the
tetragonal plane (Hc ≈ 0.5 T), but not for H||c up to 4 T. The excitation spectrum is characterized
by two well-defined modes, one completely dispersionless at 6 meV, the other strongly dispersing
to a gap of 2 meV. The reason for such complex ground state and spin excitations may be geometrical
frustration of the Cu²⁺ spins within the tetrahedra, intra- and inter-tetrahedral couplings having
similar strengths and strong Dzyaloshinski–Moriya anisotropy. Candidates for the dominant
intra- and inter-tetrahedral interactions are proposed.
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| first_indexed | 2025-11-24T06:16:40Z |
| format | Article |
| fulltext | |
| id | nasplib_isofts_kiev_ua-123456789-121701 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-11-24T06:16:40Z |
| publishDate | 2005 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | Zaharko, O. Ronnow, H.M. Daoud-Aladine, A. Streule, S. Juranyi, F. Mesot, J. Berger, H. Brown, P.J. 2017-06-15T13:32:51Z 2017-06-15T13:32:51Z 2005 Incommensurate magnetism in the coupled spin tetrahedra system Cu₂Te₂O₅Cl₂ / O. Zaharko, H.M. Ronnow, A. Daoud-Aladine, S. Streule, F. Juranyi,
 J. Mesot, H. Berger, P.J. Brown // Физика низких температур. — 2005. — Т. 31, № 8-9. — С. 1068-1072. — Бібліогр.: 17 назв. — англ. 0132-6414 PACS: 75.30.–m, 61.12.Ld, 75.10.Jm https://nasplib.isofts.kiev.ua/handle/123456789/121701 Neutron scattering studies on powder and single crystals have provided new evidences for unconventional
 magnetism in Cu₂Te₂O₅Cl₂. The compound is built from tetrahedral clusters of S = 1/2
 Cu²⁺ spins located on a tetragonal lattice. Magnetic ordering, emerging at TN = 18.2 K, leads to a
 very complex multi-domain, most likely degenerate, ground state, which is characterized by an incommensurate
 (ICM) wave vector k ~ [0.15, 0.42, 1/2]. The Cu²⁺ ions carry a magnetic moment
 of 0.67(1) μB/Cu²⁺ at 1.5 K and form a four helices spin arrangement with two canted pairs
 within the tetrahedra. A domain redistribution is observed when a magnetic field is applied in the
 tetragonal plane (Hc ≈ 0.5 T), but not for H||c up to 4 T. The excitation spectrum is characterized
 by two well-defined modes, one completely dispersionless at 6 meV, the other strongly dispersing
 to a gap of 2 meV. The reason for such complex ground state and spin excitations may be geometrical
 frustration of the Cu²⁺ spins within the tetrahedra, intra- and inter-tetrahedral couplings having
 similar strengths and strong Dzyaloshinski–Moriya anisotropy. Candidates for the dominant
 intra- and inter-tetrahedral interactions are proposed. The work was performed at SINQ, Paul Scherrer Institute,
 Villigen, Switzerland, at ILL reactor, Grenoble,
 France. We thank Prof. F. Mila, Dr. M. Prester, and
 Prof. A. Furrer for fruitful discussions and Swiss
 NCCR research pool MANEP of the Swiss NSF for
 financial support. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур К семидесятилетию антиферромагнетизма Incommensurate magnetism in the coupled spin tetrahedra system Cu₂Te₂O₅Cl₂ Article published earlier |
| spellingShingle | Incommensurate magnetism in the coupled spin tetrahedra system Cu₂Te₂O₅Cl₂ Zaharko, O. Ronnow, H.M. Daoud-Aladine, A. Streule, S. Juranyi, F. Mesot, J. Berger, H. Brown, P.J. К семидесятилетию антиферромагнетизма |
| title | Incommensurate magnetism in the coupled spin tetrahedra system Cu₂Te₂O₅Cl₂ |
| title_full | Incommensurate magnetism in the coupled spin tetrahedra system Cu₂Te₂O₅Cl₂ |
| title_fullStr | Incommensurate magnetism in the coupled spin tetrahedra system Cu₂Te₂O₅Cl₂ |
| title_full_unstemmed | Incommensurate magnetism in the coupled spin tetrahedra system Cu₂Te₂O₅Cl₂ |
| title_short | Incommensurate magnetism in the coupled spin tetrahedra system Cu₂Te₂O₅Cl₂ |
| title_sort | incommensurate magnetism in the coupled spin tetrahedra system cu₂te₂o₅cl₂ |
| topic | К семидесятилетию антиферромагнетизма |
| topic_facet | К семидесятилетию антиферромагнетизма |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/121701 |
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