Increased terahertz conductivity with magnetic disorder in the 5d-oxide double perovskite family Sr<sub>2-x</sub>Ca<sub>x</sub>CoOsO<sub>6</sub>
ORAL
Abstract
We present the results of the terahertz (THz) conductivity studies in the double perovskite family of 5d-oxides Sr2-xCaxCoOsO6. As a function of composition x, this family of double perovskites undergoes a transformation from robust antiferromagnetic order at x=0, to spin glasses at x=1, and then eventually to a ferrimagnetic state at x=2. We find that concomitant with these changes is the steady increase of the THz conductivity that cannot be explained with the expected changes to the optical phonon frequency with composition. We discuss the possibility of these changes being associated with the increase of magnetic disorder as a function of composition, particularly around x=1.
*Support for this work was provided by the Center for Emergent Materials, an NSF MRSEC, under grant 1420451.
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Presenters
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Rolando Valdes Aguilar
- Department of Physics, Ohio State Univ - Columbus
- Center for Emergent Materials. Department of Physics, The Ohio State University
- Physics, Ohio State University - Columbus
- Ohio State Univ - Columbus
- Department of Physics , The Ohio State University