| Автор | A M Gennaro |
| Автор | R Calvo |
| Дата выпуска | 1989-10-02 |
| dc.description | Single crystal ESR measurements at 33.6 GHz (Q band) in the layered copper-amino acid complex bis (L-Phenylalaninato) copper (II), Cu (L-Phe)<sub>2</sub>, are reported and compared with earlier results at 9.7 GHz (X band). Strong frequency-dependent effects were observed in the linewidth which were isolated by subtracting the Q-band data from the X-band ones. The difference data were least-squares fitted to a theoretical expression including non-secular contributions of the different interactions present in this exchange-coupled system, plus a secular contribution ('residual Zeeman') due to the existence of two copper sites with different orientations. The weight of non-secular contributions allowed us to estimate an exchange frequency omega e/2 pi =(10+or-2) GHz in Cu(L-Phe)<sub>2</sub>, which involves the interaction with the six copper neighbours. The frequency related with the exchange interaction between non-equivalent copper neighbours only, omega e<sub>AB</sub>/2 pi =(10.7+or-0.6)GHz, was calculated from the secular residual Zeeman contribution. These values indicate that the spin dynamics in Cu(L-Phe)<sub>2</sub> is mainly determined by the exchange interaction between non-equivalent copper neighbours. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Non-secular ESR broadening in a copper-amino acid complex |
| Тип | paper |
| DOI | 10.1088/0953-8984/1/39/018 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 1 |
| Первая страница | 7061 |
| Последняя страница | 7068 |
| Аффилиация | A M Gennaro; INTEC, CONICET-UNL, Santa Fe, Argentina |
| Аффилиация | R Calvo; INTEC, CONICET-UNL, Santa Fe, Argentina |
| Выпуск | 39 |
