Казанский (Приволжский) федеральный университет, КФУ
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ELECTRONIC CORRELATIONS AND CRYSTAL-FIELD EFFECTS IN RCU3RU4 O12 (R=LA, PR, ND) ELECTRONIC CORRELATIONS AND CRYSTAL-FIELD ... A. G?NTHER ET AL.
Форма представленияСтатьи в зарубежных журналах и сборниках
Год публикации2020
Языканглийский
  • 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
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