EXPERIMENTAL STUDY OF THE RESISTIVITY TENSOR IN Bi2Sr2CaCu2O8+x CRYSTALS BY MEANS OF MULTI-TERMINAL MEASUREMENTS

2000 ◽  
Vol 14 (25n27) ◽  
pp. 2884-2889
Author(s):  
S. SARTI ◽  
M. ESPOSITO ◽  
R. FASTAMPA ◽  
M. GIURA ◽  
E. SILVA
Keyword(s):  
Magnetic Field ◽  
Experimental Study ◽  
Applied Magnetic Field ◽  
Wide Temperature Range ◽  
Normal State ◽  
Resistivity Tensor ◽  
Out Of Plane ◽  
Temperature Ranges ◽  
Non Local ◽  
Probe Measurements

We present measurements of the in-plane (ρab) and out-of-plane (ρc) resistivity in BSCCO single crystals. The resistivities are measured simultaneously on the same sample by means of a multi-terminal technique. Results are presented in the normal state and in the superconducting state, both in presence and in absence of an applied magnetic field. We underline the main differences with standard four probe measurements, showing in which cases the new method is strictly needed to avoid erroneous results. The technique is also able to test the locality of the dynamic: we present an accurate experimental analysis of the temperature and magnetic field ranges where the dynamic is local or non local. We finally show that above Tc this method gives results reliable enough to allow for a detailed study of the excess conductivity. We find that the data do not follow simple Aslamazov-Larkin laws in temperature ranges wider 1K, and that an accurate description of the data over a wide temperature range must include the effects of a short-wavelength cutoff in the fluctuational spectrum.

Out-of-Plane and in-Plane Conduction in Insulating and Strongly Underdoped Cuprates

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3203-3206
Author(s):  
C. C. Almasan ◽  
G. A. Levin ◽  
E. Cimpoiasu ◽  
T. Stein ◽  
D. A. Gajewski ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Normal State ◽  
Low Temperatures ◽  
Elementary Step ◽  
Charge Carriers ◽  
Two Dimensional ◽  
Out Of Plane ◽  
Underdoped Cuprates

We report measurements of out-of-plane (ρ c ) and in-plane (ρab) normal-state resistivities of single crystals of insulating PrBa2Cu3O 7-δ and strongly underdoped oxygen deficient YBa2Cu3O 6.41 using a flux transformer method. In the superconducting specimens, the onset of superconductivity was suppressed by a magnetic field of 9 T. We have found that the anisotropy ρc/ρab of these samples increases monotonically at low temperatures with no signs of saturation. The temperature dependence of ρc/ρab for YBa2Cu3O6.41 is well described by ρc/ρab=a +bT-2/3, but over a smaller temperature range than for insulating PrBa2Cu3O 7-δ. Both the absence of saturation of ρc/ρab and its T-2/3 dependence indicate two-dimensional conduction. This means that the average in-plane hopping distance of the localized charge carriers increases with decreasing T according to Mott's [Formula: see text] law, while the elementary step in the c-direction remains T independent, equal to the spacing between the bilayers.

scholarly journals Experimental study on the effect of applied magnetic field on plane wave attenuation by microwave plasma plume

2009 ◽  
Vol 58 (7) ◽  
pp. 4793
Author(s):  
Yang Juan ◽  
Long Chun-Wei ◽  
Chen Mao-Lin ◽  
Xu Ying-Qiao ◽  
Tan Xiao-Qun
Keyword(s):  
Magnetic Field ◽  
Experimental Study ◽  
Plane Wave ◽  
Applied Magnetic Field ◽  
Plasma Plume ◽  
Microwave Plasma ◽  
Wave Attenuation

Weak Pinning Centers in Proton Irradiated YBCO Single Crystals

1991 ◽  
Vol 235 ◽  
Author(s):  
Y. J. Zhao ◽  
J. R. Liu ◽  
Y. K. Tao ◽  
P. H. Hor ◽  
W. K. Chu
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Normal State ◽  
Flux Line ◽  
Pinning Centers ◽  
Weak Center ◽  
Radiation Induced ◽  
Strong Pinning ◽  
Weak Pinning ◽  
Ybco Single Crystal

ABSTRACTObserved magnetic Jc enhancement in a 3.4 MeV proton-irradiated Y1Ba2Cu3O7-δ (YBCO) single crystal are shown to be intimately linked with a kind of weak pinning centers. Applied magnetic field transforms weak centers into the normal state or pinning centers, which then cause pinning enhancement. Strong pinning anisotropy of the radiation induced weak center can be explained very well by the size anisotropy of a superconducting unit cell and a flux line, or the coherence length.

Fluctuation and Anisotropy in the Resistivity of Bi2Sr2CaCu2O8+x Single Crystal

1999 ◽  
Vol 13 (09n10) ◽  
pp. 1131-1136
Author(s):  
R. Fastampa ◽  
M. Giura ◽  
S. Sarti ◽  
R. Marcon ◽  
D. Neri ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Single Crystal ◽  
Applied Magnetic Field ◽  
Coherence Length ◽  
Out Of Plane ◽  
Experimental Findings ◽  
Scaling Arguments

We report a study of the resistive transitions in Bi2Sr2CaCu2O8+x in presence of an applied magnetic field (up to 12 tesla) at various field orientations. We focus our attention on the results obtained with orientations parallel and perpendicular to the (a,b) planes. We show that scaling arguments, typical of dissipative regimes independent of oriented defects, can explain the experimental findings, provided a 3D-2D crossover is assumed as the temperature is lowered, due to the variation of the out of plane coherence length.

scholarly journals Резонансные ступени тока в джозефсоновских структурах с прослойкой из материала, обладающего сильным спин-орбитальным взаимодействием

2020 ◽  
Vol 62 (9) ◽  
pp. 1385
Author(s):  
К.И. Константинян ◽  
Г.А. Овсянников ◽  
А.М. Петржик ◽  
А.В. Шадрин ◽  
Ю.В. Кислинский ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Experimental Study ◽  
Microwave Irradiation ◽  
Interaction Energy ◽  
High Spin ◽  
Barrier Layer ◽  
Applied Magnetic Field ◽  
Orbit Interaction ◽  
Spin Orbit ◽  
Shapiro Steps

We report on results of experimental study of mesa heterostructures Nb/Au/Sr2IrO4/YBa2Cu3Ox with the barrier layer of Sr2IrO4, a material known as Mott antiferromagnetic insulator with high spin-orbit interaction energy, ESO ~ 0.4 eV. Under the influence of magnetic field H<15 Oe the resonant steps were registered at voltages Vn  1/L, inversely proportional to the width of the structures L. In contrast to the equidistant Fiske steps, changing the polarity of biasing current I, an asymmetry in Vn has been observed with a difference of voltage spacing between the steps. A change of applied magnetic field H has no effect of the voltages positions Vn , but the amplitudes of steps oscillate. Under microwave irradiation the Shapiro steps were observed demonstrating an oscillating behavior with power of applied microwaves.

Sign in / Sign up

Export Citation Format

Share Document