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Superconductivity papers

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Ginzburg Landau theory for d-wave pairing and fourfold symmetric vortex core structure
The Ginzburg Landau theory for dx2-y2-wave superconductors is constructed, by starting from the Gor'kov equation with including correction terms up to the next order of ln(Tc/T). Some of…
Naoki Enomoto, Masanori Ichioka, Kazushige MachidaSep 25, 1996
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Density of States and NMR Relaxation Rate in Anisotropic Superconductivity with Intersecting Line Nodes
We show that the density of states in an anisotropic superconductor with intersecting line nodes in the gap function is proportional to E log (αΔ0 /E) for |E| << Δ0, where Δ0 is the maximum…
Yasumasa HasegawaSep 18, 1996
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Critical State Flux Penetration and Linear Microwave Vortex Response in YBa2Cu3O7-x Films
The vortex contribution to the dc field (H) dependent microwave surface impedance Zs = Rs+iXs of YBa2Cu3O7-x thin films was measured using suspended patterned resonators. Zs(H) is shown to…
Balam A. Willemsen, J. S. Derov, S. SridharSep 3, 1996
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Nonlinear Response of HTSC Thin Film Microwave Resonators in an Applied DC Magnetic Field
The non-linear microwave surface impedance of patterned YBCO thin films, was measured using a suspended line resonator in the presence of a perpendicular DC magnetic field of magnitude comparable to…
Durga P. Choudhury, Balam A. Willemsen, John S. Derov et al.Aug 31, 1996
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On the origin of the irreversibility line in thin YBaCuO7 films with and without columnar defects
We report on measurements of the angular dependence of the irreversibility temperature Tirr(θ) in YBa2Cu3O7-δ thin films, defined by the onset of a third harmonic signal and measured by…
R. Prozorov, M. Konczykowski, B. Schmidt et al.Aug 26, 1996
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The Fluctuation Induced Pseudogap in the Infrared Optical Conductivity of High Temperature Superconductors
We study the effect of fluctuations on the ac conductivity of a layered superconductor both for c-axis and ab-plane electromagnetic wave polarizations. The fluctuation contributions of…
Francesca Federici, Andrei A. VarlamovAug 23, 1996
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Evidence for Quasiparticle Decay in Photoemission from Underdoped Cuprates
I argue that the ``gap'' recently observed at the Brillouin zone face of cuprate superconductors in photoemission by Marshall et al [Phys. Rev. Lett. 76, 4841 (1996)] and Ding et al [Nature…
R. B. LaughlinAug 15, 1996
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Strong coupling theory of the interlayer tunneling model for high temperature superconductors
The interlayer pair tunneling model of Anderson et al. is generalized to include the strong coupling effects associated with in-plane interactions. The equations for the superconducting transition…
B. Mitrovic, M. CastleAug 15, 1996
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Ginzburg-Landau-Gor'kov Theory of Magnetic oscillations in a type-II 2-dimensional Superconductor
We investigate de Haas-van Alphen (dHvA) oscillations in the mixed state of a type-II two-dimensional superconductor within a self-consistent Gor'kov perturbation scheme. Assuming that the order…
G. M. Bruun, V. N. Nicopoulos, N. F. JohnsonAug 14, 1996
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Extended bound states and resonances of two fermions on a periodic lattice
The high-Tc cuprates are possible candidates for d-wave superconductivity, with the Cooper pair wave function belonging to a non-trivial irreducible representation of the lattice point group. We…
A. S. Blaer, H. C. Ren, O. TchernyshyovAug 12, 1996
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c-Axis Infrared Conductivity of a dx2-y2-Wave Superconductor with Impurity and Spin-Fluctuation Scattering
Results of a calculation of the c-axis infrared conductivity sigmac for a dx2-y2-wave superconductor which include both elastic impurity and inelastic spin-fluctuation scattering are presented…
P. J. Hirschfeld, S. M. Quinlan, D. J. ScalapinoAug 9, 1996
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Topology and Phase Transitions in the Little-Parks Experiment
This is an analytic study of the problem of transitions between normal and superconducting phases for a sample which encloses a magnetic flux. A preliminary study of this problem, based on numerical…
Jorge Berger, Jacob RubinsteinAug 8, 1996
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Towards a Microscopic Theory for Metallic Heavy-Fermion Point Contacts
The bias-dependent resistance R(V) of NS-junctions is calculated using the Keldysh formalism in all orders of the transfer matrix element. We present a compact and simple formula for the Andreev…
F. B. Anders, K. GloosJul 26, 1996
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Strong Pinning and Plastic Deformations of the Vortex Lattice
We investigate numerically the dynamically generated plastic deformations of a 3D vortex lattice (VL) driven through a disorder potential with isolated, strong pinning centers (point-like or extended…
A. Schönenberger, A. Larkin, E. Heeb et al.Jul 26, 1996
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Spatio-temporal dynamics and plastic flow of vortices in superconductors with periodic arrays of pinning sites
We present simulations of flux-gradient-driven superconducting rigid vortices interacting with square and triangular arrays of columnar pinning sites in an increasing external magnetic field. These…
C. Reichhardt, J. Groth, C. J. Olson et al.Jul 24, 1996
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Comments on "Vortex Glass and Lattice Melting Transitions in a YNi2B2C Single Crystal"
Recently, Mun et.al. (Phys. Rev. Lett., 76, 2790 (1996)) have published their results on single crystal YNi2B2C, claiming that their experimental observations can be explained in terms of formation…
S. Sridhar, S. Oxx, B. A. Willemsen et al.Jul 20, 1996
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Flux flow resistivity and vortex viscosity of high-Tc films
The flux flow regime of high-T c samples of different normal state resistivities is studied in the temperature range where the sign of the Hall effect is reversed. The scaling of the vortex…
J. I. Martin, M. Velez, F. Guinea et al.Jul 12, 1996
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Ginzburg-Landau Theory of Josephson Field Effect Transistors
A theoretical model of high-Tc Josephson Field Effect Transistors (JoFETs) based on a Ginzburg-Landau free energy expression whose parameters are field- and spatially- dependent is developed. This…
J. J. Betouras, R. Joynt, Z. -W. Dong et al.Jul 11, 1996
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On Mean-Field Theory of Quantum Phase Transition in Granular Superconductors
In previous work on quantum phase transition in granular superconductors, where mean-field theory was used, an assumption was made that the order parameter as a function of the mean field is a convex…
M. V. SimkinJul 6, 1996
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Plastic vortex-creep in YBa2Cu3O7-x crystals
Local magnetic relaxation measurements in YBa2Cu3O7-x crystals show evidence for plastic vortex-creep associated with the motion of dislocations in the vortex lattice. This creep mechanism…
Y. Abulafia, A. Shaulov, Y. Wolfus et al.Jun 22, 1996
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Star-shaped Local Density of States around Vortices in a Type II Superconductor
The electronic structure of vortices in a type II superconductor is analyzed within the quasi-classical Eilenberger framework. The possible origin of a sixfold ``star'' shape of the local…
N. Hayashi, M. Ichioka, K. MachidaJun 21, 1996
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New Universality Class in the Superconductive Phase Transition
The superconductive phase transition in the Ginzburg-Landau theory (or Coulomb-Higgs phase transition of scalar QED in 3D) is discussed in a dual formulation which focuses on the magnetic rather than…
Hagen Kleinert, Adriaan SchakelJun 14, 1996
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Coupling of Josephson flux-flow oscillators to an external RC load
We investigate by numerical simulations the behavior of the power dissipated in a resistive load capacitively coupled to a Josephson flux flow oscillator and compare the results to those obtained for…
C. Soriano, G. Costabile, R. D. ParmentierMay 11, 1996
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Irreversible magnetization in thin YBCO films rotated in external magnetic field
The magnetization M of a thin YBaCuO film is measured as a function of the angle θ between the applied field H and the c-axis. For fields above the first critical field, but below the Bean's…
R. Prozorov, A. Poddar, E. Sheriff et al.May 2, 1996
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Low temperature thermal conductivity of Zn-doped YBCO: evidence for impurity-induced electronic bound states
The thermal conductivity of Zn-doped YBCO crystals was studied at low temperature (0.15 < T < 0.8 K) for different concentrations of Zn impurities. A small amount of Zn induces a dramatic decrease in…
K. Behnia, H. Aubin, L. Taillefer et al.Apr 22, 1996
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