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Inhomogeneous transport in heteroepitaxial La0.7Ca0.3MnO3/SrTiO3 multilayers (1999)

Jo, Moon-Ho ; Mathur, Neil D. ; Evetts, Jan E. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 75 (1999), S. 3689-3691

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: We have investigated the electrical transport properties of heteroepitaxial La0.7Ca0.3MnO3(LCMO)/SrTiO3 multilayers; as the LCMO layer thickness was varied from 25 to 2.5 nm, the metallic transition was suppressed and enhanced magnetoresistance extended over low temperatures. The results of transport and magnetic measurements imply a vertically inhomogeneous magnetic structure in the LCMO layers, with magnetically disordered interfaces. Although strain is clearly implicated in this surface disorder, we show that intrinsic magnetic disorder must also be associated with the interfaces. © 1999 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.125430

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Characteristic Spherulitic Microstructure in Partial-Melt-Processed YBa2Cu3Ox/HfO2 (2000)

Yan, Yong ; Evetts, Jan E. ; Zhang, Jin-li ; [et al.]

Westerville, Ohio : American Ceramics Society

Journal of the American Ceramic Society 83 (2000), S. 0

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ISSN: 1551-2916

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: The microstructure of partial-melt-processed YBa2Cu3Ox/HfO2 has been studied by transmission electron microscopy. A characteristic spherulitic microstructure is formed in the system. A model for the growth mechanism has been proposed. The critical heterogeneous nucleation of the YBa2Cu3Ox phase appears to occur from the melt in an epitaxially controlled manner on CuO particles. Subsequent growth of YBa2Cu3Ox platelets from the nucleus region is repeatedly interrupted by the nucleation of hafnium-rich phases in the liquid at the solid/liquid interface in a manner that again appears to be epitaxially controlled and that promotes the splay of the c orientation of the YBaCuO grain.