TY - JOUR
T1 - Parallel upper critical field of niobium/graphite bilayers
AU - Kubo, Toshiharu
AU - Ohashi, Yoshiko F.
AU - Kinoshita, Takeshi
N1 - Funding Information:
We are grateful to Prof. Y. Kaburagi of Musashi Institute of Technology for kindly supplying a precious KG crystal. We would thank Prof. E. Ohta for valuable discussions. A part of this work was supported by Keio Gijuku Academic Development Funds.
PY - 2005/4/1
Y1 - 2005/4/1
N2 - The influence of the superconducting proximity effect to the upper critical field (HC) in niobium/graphite bilayers was studied and related to the ratio T*C/TCS: T*C and TcCS are the transition temperature of Nb/KG film and that of Nb film respectively. The thickness of niobium (Nb) film was controlled about 40 nm, and that of graphite (kish graphite: KG) film ranged from 120 nm to 140 nm. For making a specimen, Nb was deposited on a KG film and a quartz glass substrate simultaneously, and magnetic field was applied parallel to the Nb/KG interface. HC of Nb/KG film (H*C) lowered from that of Nb film (HCS) at all temperatures within this work, and the value of ΔH C defined as HCS-H*C showed different temperature dependence among samples, depending on whether T*C/TCS1.00 < or ≧ 1.00. This behavior of HC suggests the additional existence of the interference of electrons in the clean KG film.
AB - The influence of the superconducting proximity effect to the upper critical field (HC) in niobium/graphite bilayers was studied and related to the ratio T*C/TCS: T*C and TcCS are the transition temperature of Nb/KG film and that of Nb film respectively. The thickness of niobium (Nb) film was controlled about 40 nm, and that of graphite (kish graphite: KG) film ranged from 120 nm to 140 nm. For making a specimen, Nb was deposited on a KG film and a quartz glass substrate simultaneously, and magnetic field was applied parallel to the Nb/KG interface. HC of Nb/KG film (H*C) lowered from that of Nb film (HCS) at all temperatures within this work, and the value of ΔH C defined as HCS-H*C showed different temperature dependence among samples, depending on whether T*C/TCS1.00 < or ≧ 1.00. This behavior of HC suggests the additional existence of the interference of electrons in the clean KG film.
KW - Graphite
KW - Niobium
KW - Proximity effect
KW - Superconductor
KW - Upper critical field
UR - http://www.scopus.com/inward/record.url?scp=14944369941&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=14944369941&partnerID=8YFLogxK
U2 - 10.1016/j.physc.2005.01.010
DO - 10.1016/j.physc.2005.01.010
M3 - Article
AN - SCOPUS:14944369941
SN - 0921-4534
VL - 420
SP - 78
EP - 82
JO - Physica C: Superconductivity and its applications
JF - Physica C: Superconductivity and its applications
IS - 3-4
ER -