Coexistence of long-ranged charge and orbital order and spin-glass state in single-layered manganites with weak quenched disorder

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dc.creatorMathieu, R.
dc.creatorHe, J. P.
dc.creatorYu, X. Z.
dc.creatorKaneko, Y.
dc.creatorUchida, M.
dc.creatorlee, Y. S.
dc.creatorArima, T.
dc.creatorAsamitsu, A.
dc.creatorTokura, Y.
dc.date2007-01-10
dc.date2007-09-10
dc.date.accessioned2026-07-07T08:34:50Z
dc.date.available2026-07-07T08:34:50Z
dc.descriptionThe relationship between orbital and spin degrees of freedom in the single-crystals of the hole-doped Pr$_{1-x}$Ca$_{1+x}$MnO$_4$, 0.3 $\leq$ $x$ $\leq$ 0.7, has been investigated by means of ac-magnetometry and charge transport. Even though there is no cation ordering on the $A$-site, the quenched disorder is extremely weak in this system due to the very similar ionic size of Pr$^{3+}$ and Ca$^{2+}$. A clear asymmetric response of the system to the under- (respective over-) hole doping was observed. The long-ranged charge-orbital order established for half doping ($x$=0.5) subsists in the over-doping case ($x$ $>$ 0.5), albeit rearranged to accommodate the extra holes introduced in the structure. The charge-orbital order is however destabilized by the presence of extra localized electrons (under-doping, $x$ $<$ 0.5), leading to its disappearance below $x$=0.35. We show that in an intermediate under-doped region, with 0.35 $\leq$ $x$ $<$ 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 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.
dc.descriptionEPL style; 6 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0701191
dc.identifierhttp://arxiv.org/abs/cond-mat/0701191
dc.identifierEurophys. Lett. 80, 37001 (2007).
dc.identifierdoi:10.1209/0295-5075/80/37001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/139571
dc.subjectMaterials Science
dc.titleCoexistence of long-ranged charge and orbital order and spin-glass state in single-layered manganites with weak quenched disorder
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