engleski

Magnetic resonance study of rare-earth titanates

Rare-earth titanates are a model system for investigations of interplay between spin, orbital and lattice degrees of freedom. Ground state magnetic order, through subtle lattice distortions, is easily manipulated by the size of the rare-earth ion. Peculiar deviations from Curie-Weiss law and anomalous magnetic behaviors have been detected well above ordering temperatures in the parent compound YTiO3. We utilized magnetic resonance (NMR, ESR) techniques to explore these discrepancies. All measurements were conducted on single-crystalline samples of (Y, La, Ca)TiO3 in a wide range of charge (Ca) doping and isovalent (La) substitution. NMR confirmed the existence of anomalies in the paramagnetic phase of these compounds. X-band ESR measurements were able to detect a small splitting of the lower t2g orbital which scales with the sample Tc and could explain the unusual properties. We also directly measured the crystalline anisotropies of YTO3 with ferromagnetic resonance.

NMR ; ESR ; rare-earth titanates ; magnetizm

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