MAGNETORESISTIVITY PROPERTIES AND EFFECTIVE ACTIVATION ENERGY IN YBa2Cu3O7-ρ SUPERCONDUCTING THIN FILM

2006 ◽  
Vol 20 (29) ◽  
pp. 1847-1852
Author(s):  
ALI IHSAN DEMIREL ◽  
SALIM ORAK
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Activation Energy ◽  
Applied Field ◽  
Effective Activation Energy ◽  
Creep Process ◽  
Two Dimensional ◽  
Effective Activation ◽  
Exponential Behavior ◽  
Superconducting Thin Film

The resistive properties and activation energy of YBa 2 Cu 3 O 7-ρ ( YBCO ) superconducting materials change in magnetic field. It is explained that magnetoresistive behavior in terms of the presence of two-dimensional vortices being pinned effectively when they are perpendicular to the CuO 2 planes and an exponential behavior of the activation energy versus the applied field was obtained. The resulting activation energies ranging from 1 to 5 Tesla were attributed to inter-granular flux creep process.

MAGNETIC RESISTIVITY IN Bi2Sr2Ca(Cu1-xCox)2Od EPITAXIAL THIN FILMS

2007 ◽  
Vol 21 (01) ◽  
pp. 127-132
Author(s):  
T. R. YANG ◽  
G. ILONCA ◽  
V. TOMA ◽  
P. BALINT ◽  
M. BODEA
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Activation Energy ◽  
Glass Transition ◽  
Effective Activation Energy ◽  
Epitaxial Thin Films ◽  
Effective Activation ◽  
High Quality ◽  
Plastic Deformations ◽  
Magnetic Resistivity

The scaling behavior of the effective activation energy of high-quality epitaxial c-oriented Bi 2 Sr 2 Ca ( Cu 1-x Co x)2 O d thin films with 0≤x ≤0.025 has been studied as a function of temperature and magnetic field. For all samples, the effective activation energy scales as U(T, μoH)=Uo(1-T/T c )mHn with exponent m=1.25±0.03, n=-1/2 and the field scaling 1/μoH and -UμoH for thick films and ultra thin films, respectively. The results are discussed taking into account of the influence of the Co substitution with a model in which U(T, H) arises from plastic deformations of the viscous flux liquid above the vortex-glass transition temperature.

Temperature dependence effective activation energy in Tl2Ba2CaCu2O8 thin film

2006 ◽  
Vol 243 (6) ◽  
pp. 1314-1320 ◽  
Author(s):  
S. L. Liu ◽  
G. J. Wu ◽  
L. Shan ◽  
J. Wu ◽  
X. B. Xu ◽  
...  
Keyword(s):  
Thin Film ◽  
Activation Energy ◽  
Temperature Dependence ◽  
Effective Activation Energy ◽  
Effective Activation

ACTIVATION ENERGY OF Bi2Sr2Ca(Cu1-xFex)2O8+d THIN FILMS

2001 ◽  
Vol 15 (22) ◽  
pp. 959-964 ◽  
Author(s):  
G. ILONCA ◽  
A. V. POP ◽  
G. STIUFIUC ◽  
C. LUNG ◽  
R. STIUFIUC
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Activation Energy ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Temperature Dependence ◽  
Effective Activation Energy ◽  
Effective Activation ◽  
Plastic Deformations

The scaling behavior of the effective activation energy U(T,H) of epitaxial c-axis oriented Bi 2 Sr 2 Ca ( Cu 1-x Fe x)2 O 8+d thin films with 0 ≤ x ≤ 0.02 has been studied as a function of temperature and magnetic field. It has been found that the activation energy scales as U(H,T) = U0(1 - t)mHn with exponent m = 1.15 ± 0.03 and n = -1/2. The field and temperature dependence of the activation energy, as well as its overall magnitude is consistent with a model in which U(T,H) arises from plastic deformations of viscous flux liquid above the vortex-glass transition temperature.

Photocurrent analysis of In–Ga–Zn–O (IGZO) film

2014 ◽  
Vol 92 (7/8) ◽  
pp. 611-614 ◽  
Author(s):  
Ju-Yeon Kim ◽  
Kyeong-Min Yu ◽  
So-Hyeon Jeong ◽  
Eui-Jung Yun ◽  
Byung Seong Bae
Keyword(s):  
Thin Film ◽  
Activation Energy ◽  
Effective Activation Energy ◽  
Light Illumination ◽  
Effective Activation ◽  
State Distribution ◽  
Relaxation Energy ◽  
The Right ◽  
Relaxation Characteristics ◽  
Vacancy State

We investigated the electrical properties of the In–Ga–Zn–O (IGZO) film under light illumination. We measured the photoconductivity of a-IGZO thin film under light illumination with various intensities. We extracted the photoexcitation activation energy and dark relaxation activation energy through extended stretched exponential analysis. Dark relaxation characteristics, which are related to the recombination process, show longer time constant, τ, larger effective activation energy Eac, and lower stretching exponent, β, with wider activation energy bandwidth, Δac, than those corresponding to those of photoexcitation. These indicate that recombination takes place more slowly and through more deeply bound activation processes with the broader distribution of activation energies than those corresponding to photogeneration process. The wider distribution for the dark relaxation energy for the higher light intensity suggests that the metastable state distribution is related to the distribution of the oxygen vacancy state, Vo. We also concluded that the usage of the right value of the attempt-to-escape frequency is important to estimate the exact value of Eac.

MAGNETIC FIELD AND TEMPERATURE DEPENDENCE OF THERMALLY ACTIVATED DISSIPATION IN EPITAXIAL THIN FILMS OF YBa2 (Cu1-xZnx)3O7-d

2001 ◽  
Vol 15 (22) ◽  
pp. 949-957 ◽  
Author(s):  
G. ILONCA ◽  
A. V. POP ◽  
T. JURCUT ◽  
E. MOCOCEAN ◽  
C. BEIUSEANU ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Activation Energy ◽  
Ultrathin Films ◽  
Flux Pinning ◽  
Effective Activation Energy ◽  
Epitaxial Thin Films ◽  
Effective Activation ◽  
Thermally Activated ◽  
Zn Substitution

The scaling behavior of the effective activation energy of high-quality epitaxial c-oriented YBa 2( Cu 1-x Zn x)3 O 7-d thin films has been studied as a function of temperature and magnetic field. For all samples, the effective activation energy scales as U(T, μ0H) = U0(1 - T/T c )mHn with exponent m = 1.6 ± 0.02 - 1.3 ± 0.02 and the field scaling 1/μ0H and - ln μ0H for thick films and ultrathin films, respectively. The results are discussed taking account of the influence of the Zn substitution on the flux pinning in epitaxial YBa 2( Cu 1-x Zn x)3 O 7-d thin films.

scholarly journals Moving Pearl Vortices in Thin-Film Superconductors

2021 ◽  
Vol 6 (1) ◽  
pp. 4
Author(s):  
Vladimir Kogan ◽  
Norio Nakagawa
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Time Dependent ◽  
Superconducting Thin Film ◽  
Self Energy ◽  
London Equation ◽  
The Magnetic Field

The magnetic field hz of a moving Pearl vortex in a superconducting thin-film in (x,y) plane is studied with the help of the time-dependent London equation. It is found that for a vortex at the origin moving in +x direction, hz(x,y) is suppressed in front of the vortex, x>0, and enhanced behind (x<0). The distribution asymmetry is proportional to the velocity and to the conductivity of normal quasiparticles. The vortex self-energy and the interaction of two moving vortices are evaluated.

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