Magnetic properties and magnetoresistance of the Ru-substitutedTl2Mn2−xRuxO7pyrochlore

Autor:	Josep Fontcuberta, R. Senis, Pierre Strobel, C. Bougerol-Chaillout, M. Pernet, W. Cheikh-Rouhou, Benjamín Martínez
Rok vydání:	2000
Předmět:	Physics Paramagnetism Magnetoresistance Magnetic moment Degree (graph theory) Condensed matter physics Ferromagnetism Transition temperature Pyrochlore engineering Antiferromagnetism Condensed Matter::Strongly Correlated Electrons engineering.material
Zdroj:	Physical Review B. 61:11637-11642
ISSN:	1095-3795 0163-1829
Popis:	We report on the magnetotransport properties of the ${\mathrm{Tl}}_{2}{\mathrm{Mn}}_{2\ensuremath{-}x}{\mathrm{Ru}}_{x}{\mathrm{O}}_{7}$ pyrochlore as a function of the substitution degree $0l~xl~2.$ The evolution of the paramagnetic moment as a function of x in this series of samples points to an itinerant character of the Ru $4d$ electrons for $xl~1.$ For larger values of x some localization of Ru $4d$ electrons sets in and its contribution to the paramagnetic moment is detected. The appearance of a magnetic moment in Ru atoms promotes a remarkable magnetic irreversibility, which is attributed to the reinforcement of nearest-neighbor antiferromagnetic interactions within the Mn/Ru-O sublattice and the concomitant magnetic frustration. In agreement with this hypothesis, the ferromagnetic transition temperature ${T}_{c}$ and the saturation magnetization ${M}_{s}$ both decrease with x. Noticeable magnetoresistance is only found for $xl0.3,$ being maximum around $x=0.05.$
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5044880e2d6fb27baac1894529e09aa2 https://doi.org/10.1103/physrevb.61.11637 Zobrazit plný text záznamu