Colossal magnetoresistance without phase separation: Disorder-induced spin glass state and nanometer scale orbital-charge correlation in half doped manganites

Abstract

The magnetic and electrical properties of high quality single crystals of $A$-site disordered (solid solution) Ln${}_{0.5}$Ba${}_{0.5}$MnO${}_3$ are investigated near the phase boundary between the spin glass insulator and colossal-magnetoresistive ferromagnetic metal, locating near Ln = Sm. The temperature dependence of the ac-susceptibility and the x-ray diffuse scattering of Eu${}_{0.5}$Ba${}_{0.5}$MnO${}_3$ are analyzed in detail. The uniformity of the random potential perturbation in Ln${}_{0.5}$Ba${}_{0.5}$MnO${}_3$ crystals with small bandwidth yields, rather than the phase separation, an homogeneous short ranged charge/orbital order which gives rise to a nearly-atomic spin glass state. Remarkably, this microscopically disordered ``CE-glass'' state alone is able to bring forth the colossal magnetoresistance.

REVTeX 4 style; 4 pages, 4 figures; revised 4/9 and accepted for publication

References in corpus (4)

• Competing Orders and Disorder-induced Insulator to Metal Transition in Manganites
• Theoretical Study of Half-Doped Models for Manganites: Fragility of the CE Phase with Disorder, Two Types of Colossal Magnetoresistances, and Charge-Ordered States for Electron-Doped Materials
• Spin Glasses: A Ghost Story
• Pressure induced transition from a spin glass to an itinerant ferromagnet in half doped manganite Ln0.5Ba0.5MnO3 (Ln=Sm and Nd) with quenched disorder

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