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Coexistence of long-ranged charge and orbital order and spin-glass state in single-layered manganites with weak quenched disorder
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
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2007 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 80, no 3, 37001- p.Article in journal (Refereed) Published
Abstract [en]

The relationship between orbital and spin degrees of freedom in the single crystals of the hole-doped Pr1-xCa1+xMnO4, 0.3 <= x <= 0.7 has been investigated by means of ac-magnetometry and charge transport. We show that in an intermediate underdoped region, with 0.35 <= x < 0.5, the "orbital-master spin-slave" relationship commonly observed in half-doped manganites does not take place. The long-ranged charge-orbital order is not accompanied by an antiferromagnetic transition at low temperatures, but by a frustrated short-ranged magnetic state bringing forth a spin-glass phase. We discuss in detail the nature and origin of this true spin-glass state, which, as in the half-doped manganites with large quenched disorder, is not related to the macroscopic phase separation observed in crystals with minor defects or impurities.

Place, publisher, year, edition, pages
2007. Vol. 80, no 3, 37001- p.
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-37077DOI: 10.1209/0295-5075/80/37001ISI: 000250409800014ScopusID: 2-s2.0-79051469132OAI: diva2:432009
Available from: 2011-07-28 Created: 2011-07-28 Last updated: 2011-07-28Bibliographically approved

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