The current filament model of the microwave induced zero-resistance state

2007 ◽  
Author(s):  
J. Oswald
Keyword(s):  
Current Filament ◽  
Zero Resistance ◽  
Resistance State

Zero-resistance state of two-dimensional electrons in a quantizing magnetic field

1982 ◽  
Vol 25 (2) ◽  
pp. 1405-1407 ◽  
Author(s):  
D. C. Tsui ◽  
H. L. Störmer ◽  
A. C. Gossard
Keyword(s):  
Magnetic Field ◽  
Two Dimensional ◽  
Zero Resistance ◽  
Resistance State ◽  
Quantizing Magnetic Field

FLUCTUATION-INDUCED CONDUCTIVITY OF POLYCRYSTALLINE Er1-xCexBa2Cu3O7-δ SUPERCONDUCTOR

2011 ◽  
Vol 25 (20) ◽  
pp. 1671-1681 ◽  
Author(s):  
YURI APARECIDO OPATA ◽  
ANDERSON ROSA KURELO ◽  
LINCOLN BRUM DE LEITE ◽  
GUSMÃO PINHEIRO ◽  
PEDRO RODRIGUES ◽  
...  
Keyword(s):  
Phase Transition ◽  
Power Law ◽  
Partial Substitution ◽  
Temperature Derivative ◽  
Electrical Measurements ◽  
Fluctuation Conductivity ◽  
Structural Distortions ◽  
Zero Resistance ◽  
Resistance State ◽  
Fluctuation Induced Conductivity

A detailed study of the effect caused by the partial substitution of Er by Ce on fluctuation conductivity of the Er 1-x Ce x Ba 2 Cu 3 O 7-δ; 0 ≤ x ≤ 0.10; is presented. The combined experimental results of structural and electrical measurements indicate that Ce substitutes Er for x ≤ 0.10 with no significant structural distortions. However, there is suppression of the superconducting state with zero-resistance state at temperatures ≥ 86.3 K. The results were analyzed in terms of the temperature derivative of the resistivity and the logarithmic temperature derivative of the conductivity to identify power-law divergences of the conductivity. The data revealed the occurrence of a two-stage intragranular-intergranular transition. Above the critical temperature, the Gaussian and critical regimes were observed. Also, from the critical exponents analysis, we observed a splitting of the pairing transition for Ce -doped samples, suggesting the occurrence of a phase separation. On approaching the zero resistance state, our results showed a power-law behavior that corresponds to a phase transition from a paracoherent to a coherent state of the granular array and which does not depend on Ce doping.

scholarly journals Emergence of Domains and Nonlinear Transport in the Zero-Resistance State

2013 ◽  
Vol 111 (20) ◽  
Author(s):  
I. A. Dmitriev ◽  
M. Khodas ◽  
A. D. Mirlin ◽  
D. G. Polyakov
Keyword(s):  
Nonlinear Transport ◽  
Zero Resistance ◽  
Resistance State

scholarly journals Domain Patterns in the Microwave-Induced Zero-Resistance State

2006 ◽  
Vol 125 (5-6) ◽  
pp. 1093-1107 ◽  
Author(s):  
Ilya Finkler ◽  
Bertrand I. Halperin ◽  
Assa Auerbach ◽  
Amir Yacoby
Keyword(s):  
Zero Resistance ◽  
Resistance State

FLUCTUATION-INDUCED CONDUCTIVITY OF POLYCRYSTALLINE Er1-xTbxBa2Cu3O7-δ SUPERCONDUCTORS

2009 ◽  
Vol 23 (11) ◽  
pp. 1367-1375 ◽  
Author(s):  
ALCIONE ROBERTO JURELO ◽  
PEDRO RODRIGUES ◽  
ROSÂNGELA MENEGOTTO COSTA
Keyword(s):  
Phase Transition ◽  
Electrical Conductivity ◽  
Coherent State ◽  
Power Law ◽  
Critical Exponents ◽  
Metastable Phase ◽  
Temperature Derivative ◽  
Zero Resistance ◽  
Resistance State ◽  
Fluctuation Induced Conductivity

We have studied fluctuations on the electrical conductivity of granular compounds of Er 1-x Tb x Ba 2 Cu 3 O 7-δ(0 ≤ x ≤ 0.10) superconductors. From the temperature derivative of the resistivity, we have found that the transition proceeds in two intragranular–intergranular stages, with intergranular character accentuated for higher concentrations of terbium (x ≅ 0.10). The data also revealed the occurrence of critical regimes, as well as fluctuation regimes beyond 3D-XY. However, for higher concentrations of terbium, it was not possible to observe fluctuation regimes beyond 3D-XY, probably because TbBa 2 Cu 3 O 7-δ is a metastable phase. Below TC, on approaching the zero resistance state, our results showed a power-law behavior with critical exponents consistent with a phase transition from a paracoherent to a coherent state of the granular array.

MAGNETOTRANSPORT PROPERTIES OF GdBa2Cu3O7 - δ SUPERCONDUCTING THIN FILMS

2002 ◽  
Vol 09 (05n06) ◽  
pp. 1791-1794
Author(s):  
J. ROA-ROJAS ◽  
D. A. LANDÍNEZ TÉLLEZ ◽  
P. PRIETO
Keyword(s):  
Thin Films ◽  
Vortex Motion ◽  
Mean Field ◽  
Thermal Fluctuations ◽  
Pure Oxygen ◽  
Hall Resistivity ◽  
Field Independent ◽  
Zero Resistance ◽  
Resistance State

Systematic measurements of the Hall and longitudinal resistivities as a function of temperature in GdBa 2 Cu 3 O 7 - δ thin films were effectuated. These were performed in magnetic fields B = 0, 1, 2, 3, 4 and 5 T, applied perpendicular to the transport current orientation. Films were prepared by an in-situ high-pressure dc-sputtering technique in an atmosphere of pure oxygen. In the normal phase, the Hall coefficient is positive and varies inversely proportional to temperature. The Hall angle changes approximately as predicted by Anderson's formula. When the temperature approaches the mean-field critical temperature Tc from above, the Hall resistivity decreases abruptly in consequence of thermal fluctuations. Below Tc the Hall response changes signal, goes through a minimum and vanishes when the zero resistance is attained. We ascribe the sign-reversal feature to combined effects of thermal fluctuations and vortex motion. Close to the zero-resistance state, the Hall resistivity varies as a power law of the longitudinal resistivity, with a field-independent exponent. This result may be interpreted as evidence of a vortex-glass transition.

ON THE CURRENT DOMAIN PICTURE OF THE MICROWAVE INDUCED ZERO-RESISTANCE OF HIGH MOBILITY QUANTUM HALL SYSTEMS

2004 ◽  
Vol 18 (27n29) ◽  
pp. 3489-3492 ◽  
Author(s):  
MANFRED OSWALD ◽  
JOSEF OSWALD
Keyword(s):  
Domain Walls ◽  
Quantum Hall ◽  
High Mobility ◽  
Hall Resistance ◽  
Quantum Hall Systems ◽  
Current Path ◽  
Zero Resistance ◽  
Longitudinal Resistance ◽  
Resistance State ◽  
Current Filaments

Numerical simulations of the current domain picture, which is frequently used to describe the microwave induced zero resistance state of high mobility 2-dimensional electron systems, are shown. We demonstrate, that we obtain a situation, which is equivalent to the current domain picture by introducing an artificial domain wall into our network model for magneto transport. However, in contrast to the current domain picture the current in our simulations is insensitive to the width of the domains. Finally we propose an alternative picture where we use several domain walls, which are distributed along the current path. These serve as current filaments and lead also to a vanishing longitudinal resistance, while the Hall resistance remains unchanged.

Phase fluctuations in conventional superconductors

2021 ◽  
Author(s):  
Pratap Raychaudhuri ◽  
Surajit Dutta
Keyword(s):  
Energy Gap ◽  
Energy Scale ◽  
Bcs Theory ◽  
Superconducting Properties ◽  
Phase Fluctuations ◽  
Low Dimensions ◽  
Superconducting Energy Gap ◽  
Zero Resistance ◽  
Resistance State ◽  
Granular Superconductors

Abstract Within the Bardeen-Cooper-Schrieffer (BCS) theory, superconductivity is entirely governed by the pairing energy scale, which gives rise to the superconducting energy gap, Δ. However, another important energy scale, the superfluid phase stiffness, J, which determines the resilience of the superconductor to phase-fluctuations is normally ignored. The spectacular success of BCS theory owes to the fact that in conventional superconductors J is normally several orders of magnitude larger than Δ and thus an irrelevant energy scale. However, in certain situations such as in the presence of low carrier density, strong disorder, at low-dimensions or in granular superconductors, J can drastically come down and even become smaller than Δ. In such situations, the temperature and magnetic field evolution of superconducting properties is governed by phase fluctuations, which gives rise to novel electronic states where signatures of electronic pairing continue to exist even when the zero resistance state is destroyed. In this article, we will review the recent experimental developments on the study of phase fluctuations in conventional superconductors.

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