Two-Fluid Behaviour at the Origin of the Resistivity Peak in Doped Manganites

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dc.creatorGolosov, D. I.
dc.creatorOssi, N.
dc.creatorFrydman, A.
dc.creatorFelner, I.
dc.creatorNowik, I.
dc.creatorTsindlekht, M. I.
dc.creatorMukovskii, Y. M.
dc.date2008-02-12
dc.date2008-11-04
dc.date.accessioned2026-07-07T11:33:03Z
dc.date.available2026-07-07T11:33:03Z
dc.descriptionWe report a series of magnetic and transport measurements on high-quality single crystal samples of colossal magnetoresistive manganites, La_{0.7} Ca_{0.3} Mn O_3 and Pr_{0.7} Sr_{0.3} Mn O_3. 1 % Fe doping allows a Moessbauer spectroscopy study, which shows (i) unusual line broadening within the ferromagnetic phase and (ii) a coexistence of ferro- and paramagnetic contributions in a region, T_1<T<T_2, around the Curie point T_C. In the case of Pr_{0.7} Sr_{0.3} Mn O_3, the resistivity peak occurs at a considerably higher temperature, T_{MI}>T_2. This shows that phase separation into metallic (ferromagnetic) and insulating (paramagnetic) phases cannot be generally responsible for the resistivity peak (and hence for the associated colossal magnetoresistance). Our results can be understood phenomenologically within the two-fluid approach, which also allows for a difference between T_C and T_{MI}. Our data indeed imply that while magnetic and transport properties of the manganites are closely interrelated, the two transitions at T_C and T_{MI} can be viewed as distinct phenomena.
dc.description6 pages, including 3 figures; revised version; Europhys. Lett. (http://epljournal.edpsciences.org/), in press
dc.identifierhttps://arxiv.org/abs/0802.1664
dc.identifierhttp://arxiv.org/abs/0802.1664
dc.identifierEurophys. Lett. vol. 84, 47006 (2008).
dc.identifierdoi:10.1209/0295-5075/84/47006
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/197765
dc.subjectStrongly Correlated Electrons
dc.subjectMaterials Science
dc.titleTwo-Fluid Behaviour at the Origin of the Resistivity Peak in Doped Manganites
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