Výsledky vyhledávání - "DeLeon, M. A."

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Optical Evidence for Mixed Phase Behavior in Manganites

Autor: Gao, P., Tyson, T. A., Liu, Z., DeLeon, M. A., Dubourdieu, C.

Synchrotron infrared measurements were conducted over the range 100 to 8000 cm-1 on a self-doped LaxMnO3-d (x~~0.8) film. From these measurements we determined the conductivity, the effective number of free carriers, and the specific phonon modes as

Externí odkaz: http://arxiv.org/abs/0803.3182

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Depressed Surface Magnetization in Thin La0.8MnO3 Films

Autor: DeLeon, M. A., Tyson, T. A., Dubourdieu, C., Bossak, A., Dvorak, J., Bonfait, G.

A systematic study the magnetization in La0.8.MnO3 films of thickness varying from ultra-thin to bulk-like has been conducted. The study reveals suppression of the bulk magnetization for films up to at least 1600 A. In addition, the surface (top 50 A

Externí odkaz: http://arxiv.org/abs/0710.3793

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Local Structure of Multiferroic TbMn2O5: Evidence for an Anomalous Terbium Oxygen Distribution

Autor: Tyson, T. A., Deleon, M., Yoong, S., Cheong, S. -W.

The temperature dependent local structure of TbMn2O5 was determined by x-ray absorption spectroscopy. An anomalous Tb-O distribution is found. At high temperature it is broad but resolves into two distinct peaks below approximately 180 K. The distrib

Externí odkaz: http://arxiv.org/abs/cond-mat/0702621

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Magnetic Field Melting of the Charge-Ordered State of La0.5Ca0.5MnO3: A Local Structure Perspective

Autor: Tyson, T. A., Deleon, M., Crof, M., Harris, V. G., Kao, C. -C., Kirkland, J., Cheong, S. -W.

The local structure about the Mn site in the half doped system La0.5Ca0.5MnO3 was measured in magnetic fields up 10 T to probe the melting of the charge ordered state. Examination of the Mn-O and Mn-Mn correlations reveal three distinct regions in th

Externí odkaz: http://arxiv.org/abs/cond-mat/0306229

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