Experimental and theoretical demonstration of negative magnetization induced by particle size reduction in nano-form Gd${}_{1-x}$Ca${}_x$MnO${}_3$

Abstract

We report a pervasive phenomenon of gradual emergence of negative magnetization in typical $R_{1-x}{D}_x$MnO${}_3$ orthorhombic perovskite manganites in nano form (with $R^{3+}$ being a trivalent high-magnetic-moment ion from the heavier rare-earth elements Gd, Tb, Dy and $D^{2+}$ refers to divalent alkaline elements Sr, Ca, etc.), while the bulk form manifests no negative magnetization. Extensive magnetization studies have been carried out in Gd${}_{1-x}$Ca${}_x$MnO${}_3$ manganites around half doping. We demonstrate experimentally that particle size reduction in nano-form manganites enhances the propensity of the system to exhibit negative magnetization and provide a theoretical explanation for the phenomenon. To test the universality of our findings, we have extended the measurement to Dy${}_{0.6}$Ca${}_{0.4}$MnO${}_3$ and obtained similar results.

arXiv comment12 pages and 12 figures

References in corpus (8)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Magnetic inversion symmetry breaking and ferroelectricity in TbMnO3
• Distorted Perovskite with e_g^1 Configuration as a Frustrated Spin System
• Orbital ordering phenomena in $d$- and $f$-electron systems
• Role of Orbitals in the Physics of Correlated Electron Systems
• Many-Polaron Effects in the Holstein Model
• Observation of magnetization reversal in epitaxial Gd0.67Ca0.33MnO3 thin films
• Giant magnetoelectric effect in pure manganite-manganite heterostructures

Cited by in corpus (1)

• Magnetic and Electrical Properties of high-entropy rare-earth manganites