Dimensional Crossover in the Vortex System of Untwinned YBa2Cu3Oy Single Crystals with Highly Oxygen Deficiency

2006 ◽  
Author(s):  
Hiromi Fujita ◽  
Terukazu Nishizaki ◽  
Kuniaki Kasuga ◽  
Norio Kobayashi
Keyword(s):  
Single Crystals ◽  
Oxygen Deficiency ◽  
Dimensional Crossover ◽  
Vortex System

Dimensional crossover and oxygen deficiency in YBa2Cu3Oχ single crystals

1994 ◽  
Vol 229 (3-4) ◽  
pp. 273-279 ◽  
Author(s):  
T.R. Chien ◽  
W.R. Datars ◽  
B.W. Veal ◽  
A.P. Paulikas ◽  
P. Kostic ◽  
...  
Keyword(s):  
Single Crystals ◽  
Oxygen Deficiency ◽  
Dimensional Crossover

Flux Lattice Melting and Dimensional Crossover in Bi-2212 Single Crystals

1996 ◽  
Vol 6 (12) ◽  
pp. 2327-2354 ◽  
Author(s):  
P. H. Kes ◽  
H. Pastoriza ◽  
T. W. Li ◽  
R. Cubitt ◽  
E. M. Forgan ◽  
...  
Keyword(s):  
Single Crystals ◽  
Dimensional Crossover ◽  
Flux Lattice

scholarly journals Dimensional crossover of charge density wave and thermoelectric properties in CeTe2−xSbx single crystals

2012 ◽  
Vol 101 (14) ◽  
pp. 143901 ◽  
Author(s):  
Kyung Eun Lee ◽  
Byeong Hun Min ◽  
Jong-Soo Rhyee ◽  
Jae Nyeong Kim ◽  
Ji Hoon Shim ◽  
...  
Keyword(s):  
Charge Density ◽  
Single Crystals ◽  
Thermoelectric Properties ◽  
Charge Density Wave ◽  
Density Wave ◽  
Dimensional Crossover

scholarly journals Composition variation and electron irradiation effects on the fluctuation conductivity in Y1–zPrzBa2Cu3O7−δ single crystals

2020 ◽  
Vol 31 (21) ◽  
pp. 19429-19436
Author(s):  
A. Chroneos ◽  
D. D. Kolesnikov ◽  
I. A. Taranova ◽  
A. V. Matsepulin ◽  
R. V. Vovk
Keyword(s):  
Single Crystals ◽  
Oxygen Deficiency ◽  
High Energy ◽  
Superconducting Transition ◽  
Crossover Point ◽  
Fluctuation Conductivity ◽  
High Energy Electrons ◽  
Composition Variation ◽  
Temperature Dependences ◽  
Different Temperatures

AbstractA comparative analysis of the changes in the fluctuation conductivity and characteristics of the superconducting state of YBa2Cu3O7–δ single crystals caused by various types of defects is carried out. These defects appeared due to irradiation with high-energy electrons (radiation doses from 1.4 to 8.8 1018 cm–2), changes in oxygen deficiency (0.08 ≤ δ ≤ 0.23) due to annealing at different temperatures, or doping with praseodymium (Y1–zPrzBa2Cu3O7−δ, 0 ≤ z ≤ 0.5 at optimal oxygen concentration). It is shown that the introduction of such defects leads to a significant expansion of the temperature range of the existence of excess conductivity, and upon doping with praseodymium, it also leads to the appearance of a thermally activated deflection on the temperature dependence of the electrical resistance. The effect of such defects on the superconducting transition temperature, Tc, and the coherence length along the c axis, ξc(0), is studied. In particular, ξc(0) more than quadruples (at z = 0.43), while the 2D-3D crossover point shifts towards higher temperatures. Possible reasons for the suppression of superconductivity in YBa2Cu3O7–δ upon irradiation with fast electrons and the qualitatively different temperature dependences of its resistivity in the basal plane, ρab (T), are discussed.

Influence of oxygen deficiency on anisotropy and -axis critical current densities in single crystals

1999 ◽  
Vol 12 (3) ◽  
pp. 135-141 ◽  
Author(s):  
J V Thomas ◽  
G K Perkins ◽  
D E Lacey ◽  
J T Totty ◽  
L F Cohen ◽  
...  
Keyword(s):  
Single Crystals ◽  
Critical Current ◽  
Oxygen Deficiency ◽  
Current Densities

Effects of oxygen deficiency on the acoustic anomalies and phase transition behaviors of barium titanate single crystals

2018 ◽  
Vol 18 (1) ◽  
pp. 44-49
Author(s):  
Jae-Hyeon Ko ◽  
Seonhyeop Shin ◽  
Moongyu Jang ◽  
Choong Jae Won ◽  
Namjung Hur
Keyword(s):  
Phase Transition ◽  
Barium Titanate ◽  
Single Crystals ◽  
Oxygen Deficiency

Effect of small oxygen deficiency on the para-coherent transition and 2D–3D crossover in untwinned YBa2СuзО7−δ single crystals

2011 ◽  
Vol 509 (13) ◽  
pp. 4553-4556 ◽  
Author(s):  
R.V. Vovk ◽  
Z.F. Nazyrov ◽  
M.A. Obolenskii ◽  
I.L. Goulatis ◽  
A. Chroneos ◽  
...  
Keyword(s):  
Single Crystals ◽  
Oxygen Deficiency

scholarly journals Second magnetization peak, rhombic-to-square Bragg vortex glass transition, and intersecting magnetic hysteresis curves in overdoped BaFe2(As1−xPx)2 single crystals

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
L. Miu ◽  
A. M. Ionescu ◽  
D. Miu ◽  
M. Burdusel ◽  
P. Badica ◽  
...  
Keyword(s):  
Single Crystals ◽  
Essential Role ◽  
Magnetic Hysteresis ◽  
Iron Pnictides ◽  
Vortex System ◽  
Magnetization Relaxation ◽  
Hysteresis Curves ◽  
Vortex Glass ◽  
Second Magnetization Peak

Abstract The second magnetization peak (SMP) in the fourfold symmetric superconducting single crystals (such as iron pnictides and tetragonal cuprates) has been attributed to the rhombic-to-square transition (RST) of the quasi-ordered vortex solid (the Bragg vortex glass, BVG). This represents an alternative to the pinning-induced BVG disordering as the actual SMP mechanism. The analysis of the magnetic response of BaFe2(As1−xPx)2 specimens presented here shows that the SMP is not generated by the RST. However, the latter can affect the pinning-dependent SMP onset field if this is close to the (intrinsic) RST line, through the occurrence of a “shoulder” on the magnetic hysteresis curves m(H), and a maximum in the temperature variation of the DC critical current density. These features disappear in AC conditions, where the vortex system is dynamically ordered in the RST domain, emphasizing the essential role of vortex dislocations for an efficient accommodation of the vortex system to the pinning landscape and the SMP development. The m(H) shoulder is associated with a precipitous pinning-induced proliferation of dislocations at the RST, where the BVG elastic “squash” modulus softens. The DC magnetization relaxation indicates that the pinning-induced vortex system disordering continues above the RST domain, as the basic SMP mechanism.

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