Josephson-vortex states at higher magnetic fields in Bi2Sr2CaCu2O8+y

2006 ◽  
Vol 437-438 ◽  
pp. 100-103
Author(s):  
Kazuto Hirata ◽  
Shuuichi Ooi ◽  
Shan Yu ◽  
Takashi Mochiku
Keyword(s):  
Magnetic Fields ◽  
Josephson Vortex ◽  
Vortex States

IN-PLANE CURRENT DRIVEN JOSEPHSON-VORTEX LATTICE IN HIGH-Tc CUPRATES

2005 ◽  
Vol 19 (01n03) ◽  
pp. 439-441
Author(s):  
QING-HU CHEN ◽  
XIAO HU
Keyword(s):  
Magnetic Fields ◽  
Lorentz Force ◽  
Vortex Lattice ◽  
Melting Transition ◽  
Josephson Vortex ◽  
Small Current ◽  
High Tc ◽  
Current Regime ◽  
Vortex Systems ◽  
High Tc Cuprates

We performed simulations on in-plane current driven Josephson vortex systems in high- T c cuprates at weak parallel magnetic fields and /or low anisotropies. It is found that the in-plane resistivity is Lorentz-force dependent at small current regime below the melting transition. As the current increases, the Josephson vortex lattice melts dynamically, the Lorentz-force independence of resistivity reappears. These results are possibly related to the experiments on YBCO.

Vortex states in mesoscopic single crystals Bi2Sr2CaCu2O8+δ in high magnetic fields

2009 ◽  
Vol 469 (15-20) ◽  
pp. 1119-1121 ◽  
Author(s):  
J. Mirkovic ◽  
Y. Kubo ◽  
T. Saitou ◽  
I. Kakeya ◽  
T. Yamamoto ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Single Crystals ◽  
High Magnetic Fields ◽  
Vortex States

Josephson plasma resonance in Josephson vortex states

2001 ◽  
Vol 357-360 ◽  
pp. 611-613
Author(s):  
T. Wada ◽  
I. Kakeya ◽  
K. Kadowaki
Keyword(s):  
Plasma Resonance ◽  
Josephson Vortex ◽  
Vortex States ◽  
Josephson Plasma

VORTEX PHASE DIAGRAM OF UNDERDOPED YBa2Cu3Oy IN PARALLEL MAGNETIC FIELDS

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3364-3366
Author(s):  
TERUKAZU NISHIZAKI ◽  
YUKI TAKAHASHI ◽  
NORIO KOBAYASHI
Keyword(s):  
Phase Diagram ◽  
Magnetic Fields ◽  
Order Transition ◽  
Transition Line ◽  
Josephson Vortex ◽  
Two Phase ◽  
Vortex Phase Diagram ◽  
Vortex Phase ◽  
Second Order Transition ◽  
First Order Transition

In order to study the Josephson vortex phase diagram in high-Tc superconductors, we have prepared untwinned single crystals of underdoped YBa 2 Cu 3 O y and measured the c-axis resistivity ρc(T) in magnetic fields H parallel to the ab plane. In YBa 2 Cu 3 O y (Tc ~ 60 K ), the vortex liquid phase freezes into the Josephson vortex glass through two-stage processes with decreasing temperature in the high-H region above 5 T. Since the two phase transition lines consist of the first-order transition line T L (H) and the second-order transition line T g (H), the intermediated phase in the region of T g (H) < T < T L (H) is considered to be the vortex slush phase. We find that the oscillatory field dependence of T L (H) corresponds to the commensurability between the vortex spacing and the period of the CuO 2 planes. The lower critical point μ0H lcp ~ 5 T of T L (H) and the vortex slush phase result from the moderate disorder due to the oxygen vacancy in the CuO chain.

A KT Phase of Interlayer Josephson Vortex Systems in High-Tc Superconductors

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3430-3432
Author(s):  
Xiao Hu ◽  
Masashi Tachiki
Keyword(s):  
Phase Diagram ◽  
Magnetic Fields ◽  
Josephson Vortex ◽  
High Tc Superconductors ◽  
Multicritical Point ◽  
Layered Superconductors ◽  
High Tc ◽  
Continuous Melting ◽  
Melting Transitions ◽  
Vortex Systems

A novel Kosterlitz–Thouless phase and continuous melting transitions are proposed for Josephson vortex systems induced in layered superconductors by strong parallel magnetic fields. The mechanism of the phenomenon is revealed and the phase diagram with a multicritical point is presented.

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