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Electrodynamic Properties of Single-Crystal and Thin-Film Strontium Titanate, and Thin-Film Barium Strontium Titanate

Published online by Cambridge University Press:  10 February 2011

A.T. Findikoglu ,
Q.X. Jia ,
C. Kwon ,
B.J. Gibbons ,
K.Ø. Rasmussen ,
Y. Fan ,
D.W. Reagor  and
A.R. Bishop
A.T. Findikoglu
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, findik@lanl.gov
Q.X. Jia
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, findik@lanl.gov
C. Kwon
Affiliation:
Physics Department, California State University, Long Beach, CA 90840
B.J. Gibbons
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, findik@lanl.gov
K.Ø. Rasmussen
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, findik@lanl.gov
Y. Fan
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, findik@lanl.gov
D.W. Reagor
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, findik@lanl.gov
A.R. Bishop
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, findik@lanl.gov
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Abstract

We have used a coplanar waveguide structure to study broadband electrodynamic properties of single-crystal and thin-film strontium titanate (STO), and thin-film barium strontium titanate (BSTO). We have implemented low-frequency capacitance (100 Hz - 1 MHz), swept-frequency transmittance (45 MHz - 4 GHz), and time-domain transmittance (dc - several GHz) measurements to determine effective refractive index (or, dielectric constant), and dissipation factor (or, loss tangent) as a function of dc bias (up to 4×106 V/m) and temperature (20 - 300 K). The STO samples used superconducting electrodes and were designed to operate at cryogenic temperatures, whereas BSTO samples used normal conducting electrodes and exhibited optimal performance around room temperature. By using nearly identical electrode geometries for all devices, we were able to conduct a direct comparative study among them, and investigate not only single-crystal vs thin-film, but also cryogenic vs room-temperature applications.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 603: Symposium KK – Materials Issues for Tunable RF & Microwave Devices , 1999 , 27
Copyright
Copyright © Materials Research Society 2000

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