Incommensurate magnetism in the coupled spin tetrahedra system Cu₂Te₂O₅Cl₂

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 to a very comp...

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Дата:2005
Автори: Zaharko, O., Ronnow, H.M., Daoud-Aladine, A., Streule, S., Juranyi, F., Mesot, J., Berger, H., Brown, P.J.
Формат: Стаття
Мова:English
Опубліковано: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2005
Назва видання:Физика низких температур
Теми:
К семидесятилетию антиферромагнетизма
Онлайн доступ:http://dspace.nbuv.gov.ua/handle/123456789/121701
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Назва журналу:Digital Library of Periodicals of National Academy of Sciences of Ukraine
Цитувати: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
id irk-123456789-121701
record_format dspace
spelling irk-123456789-1217012017-06-16T03:03:26Z 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 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. 2005 Article 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 http://dspace.nbuv.gov.ua/handle/123456789/121701 en Физика низких температур Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
institution Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection DSpace DC
language English
topic К семидесятилетию антиферромагнетизма
К семидесятилетию антиферромагнетизма
spellingShingle К семидесятилетию антиферромагнетизма
К семидесятилетию антиферромагнетизма
Zaharko, O.
Ronnow, H.M.
Daoud-Aladine, A.
Streule, S.
Juranyi, F.
Mesot, J.
Berger, H.
Brown, P.J.
Incommensurate magnetism in the coupled spin tetrahedra system Cu₂Te₂O₅Cl₂
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.
format Article
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.
author_sort Zaharko, O.
title Incommensurate magnetism in the coupled spin tetrahedra system Cu₂Te₂O₅Cl₂
title_short 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_sort incommensurate magnetism in the coupled spin tetrahedra system cu₂te₂o₅cl₂
publisher Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
publishDate 2005
topic_facet К семидесятилетию антиферромагнетизма
url http://dspace.nbuv.gov.ua/handle/123456789/121701
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.
series Физика низких температур
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first_indexed 2023-10-18T20:40:06Z
last_indexed 2023-10-18T20:40:06Z
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