Cooper pair transport and macroscopic quantum dynamics in Josephson junctions through ferromagnetic insulators

2008 ◽  
Vol 468 (7-10) ◽  
pp. 701-704 ◽  
Author(s):  
Shiro Kawabata ◽  
Yasuhiro Asano ◽  
Yukio Tanaka ◽  
Satoshi Kashiwaya ◽  
Alexander A. Golubov
Keyword(s):  
Josephson Junctions ◽  
Quantum Dynamics ◽  
Cooper Pair ◽  
Macroscopic Quantum

scholarly journals TWO-DIMENSIONAL MACROSCOPIC QUANTUM DYNAMICS IN YBCO JOSEPHSON JUNCTIONS

2009 ◽  
Vol 23 (20n21) ◽  
pp. 4329-4337 ◽  
Author(s):  
SHIRO KAWABATA ◽  
TAKEO KATO ◽  
FLORIANA LOMBARDI ◽  
THILO BAUCH
Keyword(s):  
Josephson Junctions ◽  
Quantum Dynamics ◽  
Thermal Activation ◽  
Escape Rate ◽  
Slight Reduction ◽  
Two Dimensional ◽  
Macroscopic Quantum ◽  
Phase Dynamics ◽  
Lc Circuit ◽  
Macroscopic Quantum Tunneling

We theoretically study classical thermal activation (TA) and macroscopic quantum tunneling (MQT) for a YBa 2 Cu 3 O 7-δ( YBCO ) Josephson junction coupled with an LC circuit. The TA and MQT escape rate are calculated by taking into account the two-dimensional nature of the classical and quantum phase dynamics. We find that the MQT escape rate is largely suppressed by the coupling to the LC circuit. On the other hand, this coupling leads to the slight reduction of the TA escape rate. These results are relevant for the interpretation of a recent experiment on the MQT and TA phenomena in YBCO bi-epitaxial Josephson junctions.

Theory of macroscopic quantum tunneling in Nb/Au/YBCO Josephson junctions

2007 ◽  
Vol 463-465 ◽  
pp. 80-83 ◽  
Author(s):  
S. Kawabata ◽  
A.A. Golubov ◽  
Ariando ◽  
C.J.M. Verwijs ◽  
H. Hilgenkamp
Keyword(s):  
Quantum Tunneling ◽  
Josephson Junctions ◽  
Macroscopic Quantum ◽  
Macroscopic Quantum Tunneling

scholarly journals Observation of macroscopic quantum tunneling in La2-xSrxCuO4intrinsic Josephson Junctions

2009 ◽  
Vol 150 (5) ◽  
pp. 052132 ◽  
Author(s):  
Yuimaru Kubo ◽  
Takayoshi Tanaka ◽  
Shinya Ueda ◽  
Satoshi Ishii ◽  
Shunsuke Tsuda ◽  
...  
Keyword(s):  
Quantum Tunneling ◽  
Josephson Junctions ◽  
Macroscopic Quantum ◽  
Macroscopic Quantum Tunneling
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