Vortex slush regime in the Josephson vortex phase diagram of 60-KYBa2Cu3O7−δsingle crystals

2003 ◽  
Vol 68 (22) ◽  
Author(s):  
Tomoyuki Naito ◽  
Hideo Iwasaki ◽  
Terukazu Nishizaki ◽  
Seiya Haraguchi ◽  
Yuuya Kawabata ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Josephson Vortex ◽  
Vortex Phase Diagram ◽  
Vortex Phase

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.

Vortex phase diagram in heavy ion irradiated untwinned YBa2Cu3Oy single crystals

2007 ◽  
Vol 460-462 ◽  
pp. 1204-1205 ◽  
Author(s):  
Norio Kobayashi ◽  
Terukazu Nishizaki ◽  
Kuniaki Kasuga ◽  
Satoru Okayasu
Keyword(s):  
Phase Diagram ◽  
Single Crystals ◽  
Heavy Ion ◽  
Vortex Phase Diagram ◽  
Vortex Phase

Vortex Phase Diagram in Bi2Sr2CaCu2O y , Probed by ac-Susceptibility Measurements

1999 ◽  
pp. 621-624
Author(s):  
Takao Sasagawa ◽  
Toshiya Fujita ◽  
Hisashi Kobayashi ◽  
Jun-Ichi Shimoyama ◽  
Koichi Kitazawa ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Ac Susceptibility ◽  
Vortex Phase Diagram ◽  
Vortex Phase

Resistivity measurements and the vortex phase diagram of Bi2Sr2CaCu2O y

1996 ◽  
Vol 105 (5-6) ◽  
pp. 1189-1194 ◽  
Author(s):  
H. Ikuta ◽  
S. Watauchi ◽  
J. Shimoyama ◽  
K. Kitazawa ◽  
K. Kishio
Keyword(s):  
Phase Diagram ◽  
Resistivity Measurements ◽  
Vortex Phase Diagram ◽  
Vortex Phase

Thermodynamic study of the melting transition in the vortex phase diagram of high purity YBa2Cu3O7−δ single crystals

2000 ◽  
Vol 341-348 ◽  
pp. 1329-1330 ◽  
Author(s):  
K. Deligiannis ◽  
M. Charalambous ◽  
J. Chaussy ◽  
R. Liang ◽  
D. Bonn ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Single Crystals ◽  
High Purity ◽  
Thermodynamic Study ◽  
Melting Transition ◽  
Vortex Phase Diagram ◽  
Vortex Phase
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