KFU. Card publication. Electronic correlations and crystal-field effects in RCu3Ru4 O12 (R=La, Pr, Nd) ELECTRONIC CORRELATIONS and CRYSTAL-FIELD ... A. G?NTHER et al.

- RUS
- 中文
- ES

ELECTRONIC CORRELATIONS AND CRYSTAL-FIELD EFFECTS IN RCU3RU4 O12 (R=LA, PR, ND) ELECTRONIC CORRELATIONS AND CRYSTAL-FIELD ... A. G?NTHER ET AL.

Form of presentation

Articles in international journals and collections

Year of publication

2020

��

��

Authors, employees of KFU

Eremin Mikhail Vasilevich, author

Eremina Rushana Mikhaylovna, author

Bibliographic description in the original language

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.

Annotation

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.

Keywords

RCu3Ru4 O12, crystal field, magnetic susceptibility

The name of the journal

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

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=247686&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Eremin Mikhail Vasilevich	ru_RU
dc.contributor.author	Eremina Rushana Mikhaylovna	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/eng/?p_id=247686&p_lang=2	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	Articles in international journals and collections	ru_RU