Spin dynamics in cuprate perovskites
Vernadsky National Library of Ukraine
Переглянути архів Інформація| Поле | Співвідношення | |
| Title |
Spin dynamics in cuprate perovskites
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| Creator |
Sherman, A.
Schreiber, M. |
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| Subject |
Spin Models
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| Description |
Results obtained with the use of the t–J model of Cu–O planes and Mori’s projection operator formalism are compared with data of neutron scattering experiments in lanthanum and yttrium cuprates. This comparison allows us to interpret the intensive peak at the antiferromagnetic wave vector observed in yttrium cuprates as a manifestation of excitations of localized Cu spins. The high-frequency incommensurability detected both in lanthanum and yttrium cuprates is connected with the dispersion of these excitations, while the low-frequency incommensurability arises due to a dip in the spin-excitation damping at the antiferromagnetic wave vector. For moderate doping the dip stems from the weakness of the interaction between the spin excitations and holes near hot spots. It is conjectured that the dissimilarity of the susceptibility frequency dependencies in yttrium and lanthanum cuprates may be connected with different values of the hole bandwidth and damping in these crystals. |
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| Date |
2017-06-11T12:11:21Z
2017-06-11T12:11:21Z 2006 |
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| Type |
Article
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| Identifier |
Spin dynamics in cuprate perovskites / A. Sherman, M. Schreiber // Физика низких температур. — 2006. — Т. 32, № 4-5. — С. 499–504. — Бібліогр.: 23 назв. — англ.
0132-6414 PACS: 71.10.Fd, 74.25.Ha, 74.72.–h http://dspace.nbuv.gov.ua/handle/123456789/120191 |
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| Language |
en
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| Relation |
Физика низких температур
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| Publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
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