scholarly journals Antiferromagnetic spin fluctuations in the metallic phase of quasi-two-dimensional organic superconductors

2007 ◽  
Vol 75 (21) ◽  
Author(s):  
Eddy Yusuf ◽  
B. J. Powell ◽  
Ross H. McKenzie
Keyword(s):  
Metallic Phase ◽  
Organic Superconductors ◽  
Spin Fluctuations ◽  
Two Dimensional ◽  
Antiferromagnetic Spin

scholarly journals Calculation of the Exchange Constant in 2D Wigner Liquid

1999 ◽  
Vol 52 (5) ◽  
pp. 845
Author(s):  
V. V. Flambaum ◽  
I. V. Ponomarev ◽  
O. P. Sushkov
Keyword(s):  
Magnetic Order ◽  
Recent Observation ◽  
Metallic Phase ◽  
Range Order ◽  
Spin Interaction ◽  
Exchange Constant ◽  
Two Dimensional ◽  
Metal Insulator ◽  
Theoretical Question ◽  
Antiferromagnetic Spin

The recent observation of a two-dimensional (2D) metal–insulator transition in semiconductor devices and the strong influence of a magnetic field on the metallic phase has attracted a great deal of interest. This gives rise to the important theoretical question about the nature and the magnetic order of insulating and conducting phases. In the present paper we calculate (both analytically and numerically) the exchange constant for a two-dimensional Wigner liquid— the state with destroyed long-range order but preserved short-range order. It is demonstrated that there is an antiferromagnetic spin–spin interaction between nearest electrons. We also discuss a possible pairing of the electrons in a 2D Wigner crystal by the spin-Peierls mechanism.

scholarly journals Robust anomalous metallic states and vestiges of self-duality in two-dimensional granular In-InOx composites

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Xinyang Zhang ◽  
Bar Hen ◽  
Alexander Palevski ◽  
Aharon Kapitulnik
Keyword(s):  
Magnetic Field ◽  
Metallic Phase ◽  
Broadband Noise ◽  
Two Dimensional ◽  
Conventional Theory ◽  
Logarithmic Divergence ◽  
Self Duality ◽  
Low Field ◽  
Wide Range ◽  
Low Temperature Resistance

AbstractMany experiments investigating magnetic-field tuned superconductor-insulator transition (H-SIT) often exhibit low-temperature resistance saturation, which is interpreted as an anomalous metallic phase emerging from a ‘failed superconductor’, thus challenging conventional theory. Here we study a random granular array of indium islands grown on a gateable layer of indium-oxide. By tuning the intergrain couplings, we reveal a wide range of magnetic fields where resistance saturation is observed, under conditions of careful electromagnetic filtering and within a wide range of linear response. Exposure to external broadband noise or microwave radiation is shown to strengthen the tendency of superconductivity, where at low field a global superconducting phase is restored. Increasing magnetic field unveils an ‘avoided H-SIT’ that exhibits granularity-induced logarithmic divergence of the resistance/conductance above/below that transition, pointing to possible vestiges of the original emergent duality observed in a true H-SIT. We conclude that anomalous metallic phase is intimately associated with inherent inhomogeneities, exhibiting robust behavior at attainable temperatures for strongly granular two-dimensional systems.

scholarly journals Disordered loops in the two-dimensional antiferromagnetic spin–fermion model

2008 ◽  
Vol 795 (3) ◽  
pp. 578-595
Author(s):  
T. Enss ◽  
S. Caprara ◽  
C. Castellani ◽  
C. Di Castro ◽  
M. Grilli
Keyword(s):  
Two Dimensional ◽  
Fermion Model ◽  
Antiferromagnetic Spin

Spin fluctuations in random magnetic-nonmagnetic two-dimensional antiferromagnets. II. Heisenberg percolation

1980 ◽  
Vol 21 (1) ◽  
pp. 317-332 ◽  
Author(s):  
R. J. Birgeneau ◽  
R. A. Cowley ◽  
G. Shirane ◽  
J. A. Tarvin ◽  
H. J. Guggenheim
Keyword(s):  
Spin Fluctuations ◽  
Two Dimensional

scholarly journals Quasi-two-dimensional organic superconductors: A review

2002 ◽  
Vol 43 (2) ◽  
pp. 63-96 ◽  
Author(s):  
John Singleton ◽  
Charles Mielke
Keyword(s):  
Organic Superconductors ◽  
Two Dimensional
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