Anomalous vertebral arteries should be included in the differential diagnosis of the upper cervical lesion of unknown origin. The microsurgical decompression with presented technique has relieved the symptoms for over 6(1/2) years.
A new BaSnO3 buffer layer is proposed for controlling the in-plane orientation of YBa2Cu3O7-δ films grown on MgO substrates.
BaSnO3 buffer layers and YBa2Cu3O7-δ films are grown by pulsed laser deposition. 45° grain boundaries in YBa2Cu3O7-δ films grown on MgO (001) substrates, which are fatal defects for microwave device applications, are eliminated using the BaSnO3 buffer layer.
YBa2Cu3O7-δ films grown at an optimum growth temperature of 710°C on BaSnO3 buffer layers on MgO (001) substrates show lower surface resistance
(R
S
) than those on MgO (001) substrates without BaSnO3 buffer layers.
45° grain boundaries, which drastically increase surface resistance (RS) in superconducting YBa2Cu3O7- films for microwave devices on MgO substrates, are eliminated using a new buffer layer of BaSnO3.BaSnO3 buffer layers and YBa2Cu3O7- films are grown by ArF pulsed laser deposition. Epitaxial relationships among BaSnO3, YBa2Cu3O7- and MgO are confirmed by x-ray -scanning. The RS values of the YBa2Cu3O7- films are measured using a dielectric resonator with 22 GHz TE011 mode. The epitaxial YBa2Cu3O7- films grown on BaSnO3 buffered MgO substrates show lower RS than YBa2Cu3O7- films directly grown on MgO substrates. The BaSnO3 buffer layer which enables YBa2Cu3O7- films to grow without 45° grain boundaries at a optimum film growth condition is attractive for microwave applications.
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