Magnetic heterogeneity in electron doped La1-xCa xMnO3 manganites studied by means of electron spin resonance

Likodimos, V; Pissas, M

dc.contributor.author	Likodimos, V	en
dc.contributor.author	Pissas, M	en
dc.date.accessioned	2014-03-01T01:22:37Z
dc.date.available	2014-03-01T01:22:37Z
dc.date.issued	2005	en
dc.identifier.issn	0953-8984	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16624
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	Antiferromagnetism	en
dc.subject.other	Colossal magnetoresistance	en
dc.subject.other	Doping (additives)	en
dc.subject.other	Ferromagnetic materials	en
dc.subject.other	Ferromagnetic resonance	en
dc.subject.other	Neutron diffraction	en
dc.subject.other	Paramagnetic resonance	en
dc.subject.other	Perturbation techniques	en
dc.subject.other	Relaxation processes	en
dc.subject.other	Stoichiometry	en
dc.subject.other	Doped manganites	en
dc.subject.other	Electron doping	en
dc.subject.other	Magnetic heterogeneity	en
dc.subject.other	Neutron powder diffraction	en
dc.subject.other	Lanthanum compounds	en
dc.title	Magnetic heterogeneity in electron doped La1-xCa xMnO3 manganites studied by means of electron spin resonance	en
heal.type	journalArticle	en
heal.identifier.primary	10.1088/0953-8984/17/25/017	en
heal.identifier.secondary	http://dx.doi.org/10.1088/0953-8984/17/25/017	en
heal.language	English	en
heal.publicationDate	2005	en
heal.abstract	Electron spin resonance (ESR) has been applied to investigate the magnetic heterogeneity in electron doped La1-xCaxMnO3 (0.80≤x≤0.95). A low field ferromagnetic resonance (FMR) mode is observed for lightly doped compounds (x = 0.90,0.95), signifying the formation of ferromagnetic (FM) spin clusters within the antiferromagnetic G-type AFM phase. The anomalous temperature variations of the resonance field, linewidth and FMR intensity, as well as the observation of thermal cycling effects below TC, emphasize the non-trivial dynamics of the FM phase, which is attributed to the temperature dependent size evolution of the underlying spin clusters towards canted AFM and FM domains. For heavier electron doping (x = 0.80,0.85), distinct AFM behaviour is evinced in the vicinity of TN in the monoclinic C-type AFM phase, characterized by the absence of critical relaxation. Additional weak FMR lines are observed for x = 0.80 and 0.85, whereas a narrow superparamagnetic-like signal is detected for x = 0.95. © 2005 IOP Publishing Ltd.	en
heal.publisher	IOP PUBLISHING LTD	en
heal.journalName	Journal of Physics Condensed Matter	en
dc.identifier.doi	10.1088/0953-8984/17/25/017	en
dc.identifier.isi	ISI:000230632400023	en
dc.identifier.volume	17	en
dc.identifier.issue	25	en
dc.identifier.spage	3903	en
dc.identifier.epage	3914	en