TY - JOUR
T1 - Temperature and Magnetic Field Effects on Microwave Intermodulation in YBCO Films
AU - Abu Bakar, M
AU - Velichko, Anton
AU - Lancaster, Michael
AU - Xiong, Xuming
AU - Porch, A
PY - 2003/6/1
Y1 - 2003/6/1
N2 - The effects of temperature and dc field on third order microwave intermodulation distortion (IMD) measurements of three YBa2Cu3O7-delta (YBCO) thin films grown on LaAlO3 substrates are discussed. These films were patterned into coplanar resonators with a fundamental. resonant frequency of around 5 GHz. The measurements were performed at temperatures of 15 K and 60 K, in zero dc magnetic field and also in an applied de field of similar to 10 mT. Good quality films exhibit 3:1 IMD scalings at low temperatures and low powers, decreasing to a 2:1 scaling at higher powers and temperatures. A dc magnetic field applied perpendicularly to good quality samples results in a 2:1 scaling across the whole range of power and temperature, though without any significant change in the IMD output power within the 2:1 scaling regime; this differs for poor quality. samples, where the IMD output power can be increased by up to 20 dB by the application of a dc field.
AB - The effects of temperature and dc field on third order microwave intermodulation distortion (IMD) measurements of three YBa2Cu3O7-delta (YBCO) thin films grown on LaAlO3 substrates are discussed. These films were patterned into coplanar resonators with a fundamental. resonant frequency of around 5 GHz. The measurements were performed at temperatures of 15 K and 60 K, in zero dc magnetic field and also in an applied de field of similar to 10 mT. Good quality films exhibit 3:1 IMD scalings at low temperatures and low powers, decreasing to a 2:1 scaling at higher powers and temperatures. A dc magnetic field applied perpendicularly to good quality samples results in a 2:1 scaling across the whole range of power and temperature, though without any significant change in the IMD output power within the 2:1 scaling regime; this differs for poor quality. samples, where the IMD output power can be increased by up to 20 dB by the application of a dc field.
KW - third order intermodulation distortion
KW - high temperature superconductor
KW - microwave nonlineaiity
UR - http://www.scopus.com/inward/record.url?scp=0042967637&partnerID=8YFLogxK
U2 - 10.1109/TASC.2003.812403
DO - 10.1109/TASC.2003.812403
M3 - Article
SN - 1051-8223
VL - 13
SP - 3581
EP - 3584
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 2
ER -