| Форма представления | Статьи в зарубежных журналах и сборниках |
| Год публикации | 2020 |
| Язык | английский |
|
Еремин Михаил Васильевич, автор
Еремина Рушана Михайловна, автор
|
| Библиографическое описание на языке оригинала |
Gunther A, Riegg S, Kraetschmer W, Electronic correlations and crystal-field effects in RCu3Ru4 O12 (R=La, Pr, Nd) ELECTRONIC CORRELATIONS and CRYSTAL-FIELD ... A. GUNTHER et al.//Physical Review B. - 2020. - Vol.102, Is.23. - Art. № 235136. |
| Аннотация |
Among the large class of A-site ordered perovskites of stoichiometry AC3B4O12, the rare-earth (R) ruthenates RCu3Ru4O12 (R = La, Pr, Nd) are interesting compounds due both to Ru-4d-derived electronic correlations and to unconventional crystal-electric-field effects of the R ions. Here we report on detailed investigations of these compounds utilizing x-ray diffraction, neutron scattering, magnetic susceptibility, and electrical resistivity measurements as well as heat capacity and nuclear resonance experiments. A broad range of external parameters is scanned and depending on the specific technique, temperatures range from 100 mK to 730 K in external magnetic fields up to 14 T. In this work LaCu3Ru4O12 serves as reference compound with a nonmagnetic A site, characterized in detail recently [S. Riegg et al., Phys. Rev. B 93, 115149 (2016)]. All compounds investigated reveal heavy-fermion behavior with a T 2 dependence of the low-temperature electrical resistivity
and significantly enhanced Sommerfeld coefficients. Toward low temperatures, the compounds with R = Pr and Nd are dominated by the magnetic moments of the R ions, which occupy crystallographic positions with point-group symmetry Th. The crystal-electric-field effects are clearly visible especially in heat capacity and inelastic neutron scattering data from which the crystal-electric-field parameters are derived. The ground state
of the Pr3+ ion is identified as a triplet , whereas for Nd3+ it is a quartet. Evidence for lowering of the Th symmetry is observed at the Pr site at temperatures below 10 K, suggesting the formation of orbital order.
Moreover, the spin-lattice relaxation derived from 63Cu nuclear quadrupole resonance indicates characteristic temperatures close to 7 K and 350 mK, probably related to orbital and magnetic order, respectively. |
| Ключевые слова |
RCu3Ru4 O12, crystal field, magnetic susceptibility |
| Название журнала |
PHYSICAL REVIEW B
|
| URL |
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85098120649&doi=10.1103%2fPhysRevB.102.235136&partnerID=40&md5=19cf0df7a58af21f60cc8e1953413754 |
| Пожалуйста, используйте этот идентификатор, чтобы цитировать или ссылаться на эту карточку |
https://repository.kpfu.ru/?p_id=247686 |
Полная запись метаданных  |
| Поле DC |
Значение |
Язык |
| dc.contributor.author |
Еремин Михаил Васильевич |
ru_RU |
| dc.contributor.author |
Еремина Рушана Михайловна |
ru_RU |
| dc.date.accessioned |
2020-01-01T00:00:00Z |
ru_RU |
| dc.date.available |
2020-01-01T00:00:00Z |
ru_RU |
| dc.date.issued |
2020 |
ru_RU |
| dc.identifier.citation |
Gunther A, Riegg S, Kraetschmer W, Electronic correlations and crystal-field effects in RCu3Ru4 O12 (R=La, Pr, Nd) ELECTRONIC CORRELATIONS and CRYSTAL-FIELD ... A. GUNTHER et al.//Physical Review B. - 2020. - Vol.102, Is.23. - Art. № 235136. |
ru_RU |
| dc.identifier.uri |
https://repository.kpfu.ru/?p_id=247686 |
ru_RU |
| dc.description.abstract |
PHYSICAL REVIEW B |
ru_RU |
| dc.description.abstract |
Among the large class of A-site ordered perovskites of stoichiometry AC3B4O12, the rare-earth (R) ruthenates RCu3Ru4O12 (R = La, Pr, Nd) are interesting compounds due both to Ru-4d-derived electronic correlations and to unconventional crystal-electric-field effects of the R ions. Here we report on detailed investigations of these compounds utilizing x-ray diffraction, neutron scattering, magnetic susceptibility, and electrical resistivity measurements as well as heat capacity and nuclear resonance experiments. A broad range of external parameters is scanned and depending on the specific technique, temperatures range from 100 mK to 730 K in external magnetic fields up to 14 T. In this work LaCu3Ru4O12 serves as reference compound with a nonmagnetic A site, characterized in detail recently [S. Riegg et al., Phys. Rev. B 93, 115149 (2016)]. All compounds investigated reveal heavy-fermion behavior with a T 2 dependence of the low-temperature electrical resistivity
and significantly enhanced Sommerfeld coefficients. Toward low temperatures, the compounds with R = Pr and Nd are dominated by the magnetic moments of the R ions, which occupy crystallographic positions with point-group symmetry Th. The crystal-electric-field effects are clearly visible especially in heat capacity and inelastic neutron scattering data from which the crystal-electric-field parameters are derived. The ground state
of the Pr3+ ion is identified as a triplet , whereas for Nd3+ it is a quartet. Evidence for lowering of the Th symmetry is observed at the Pr site at temperatures below 10 K, suggesting the formation of orbital order.
Moreover, the spin-lattice relaxation derived from 63Cu nuclear quadrupole resonance indicates characteristic temperatures close to 7 K and 350 mK, probably related to orbital and magnetic order, respectively. |
ru_RU |
| dc.language.iso |
ru |
ru_RU |
| dc.subject |
RCu3Ru4 O12 |
ru_RU |
| dc.subject |
crystal field |
ru_RU |
| dc.subject |
magnetic susceptibility |
ru_RU |
| dc.title |
Electronic correlations and crystal-field effects in RCu3Ru4 O12 (R=La, Pr, Nd) ELECTRONIC CORRELATIONS and CRYSTAL-FIELD ... A. G?NTHER et al. |
ru_RU |
| dc.type |
Статьи в зарубежных журналах и сборниках |
ru_RU |
|
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