Dielectric nonlinearity and stochastic effects in strontium titanate


Applied Physics Letters 803391 (2001)

Alp Findikoglu

Materials Science and Technology, Los Alamos National Laboratory
New Mexico 87545, USA.

Roberto Camassa

T7, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
and
Department of Mathematics, University of North Carolina at Chapell Hill, NC 27599

Grant Lythe

T7, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
and
GISC, Departamento de Matemáticas, Universidad Carlos III de Madrid
28911 Leganés, Spain.

Q.X. Jia

Materials Science and Technology, Los Alamos National Laboratory
New Mexico 87545, USA.

Abstract

We report on experiments using compact coplanar waveguide devices, incorporating thin-film superconducting YBa$_2$Cu$_3$O$_7$ electrodes. The substrate is strontium titanate, whose nonlinear dielectric properties are dependent on temperature and applied electric field. Close to zero DC bias, the frequency-doubled microwave power output increases by several orders of magnitude with modest broadband noise input. Experimental results are supported by analytical and numerical calculations based on a nonlinear wave equation.

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