G. B. Arnold

University of Colorado Boulder

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D. S. Dessau

University of Colorado Boulder

Stephen Parham

University of Colorado Boulder

Genda Gu

Brookhaven National Laboratory

E. L. Wolf

New York University

T. J. Reber

Brookhaven National Laboratory

S. T. Ruggiero

University of Sannio

Haoxiang Li

Oak Ridge National Laboratory

Helmuth Berger

École Polytechnique Fédérale de Lausanne

J. F. Zasadzinski

Illinois Institute of Technology

Richard A. Klemm

Microfluidic ChipShop (Germany)

Cooperative Institutions

University of Colorado Boulder

University of Notre Dame

National Institute of Standards and Technology

Stanford University

Argonne National Laboratory

Chinese Academy of Sciences

Ames National Laboratory

Iowa State University

National Institute of Advanced Industrial Science and Technology

Cornell University

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Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+delta} c-axis twist Josephson junctions : a new phase-sensitive test of order parameter symmetry.

Journal of Low Temperature Physics (1999)

Richard A. Klemm A. Bille C. T. Rieck K. Scharnberg G. B. Arnold

Crystal (programming language)

10.1023/a:1022519127743

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Citations (5)

Theory of tunneling in superconductors

Physical review. B, Condensed matter (1978)

G. B. Arnold

The theory developed by Feuchtwang for tunneling in normal metals is extended to superconductors. It is shown that for metal---insulator---superconductor and metal---insulator---thin---metal---superconductor junctions, our results agree with the standard Bardeen "tunneling Hamiltonian" approach. In the latter case, however, if there exists a potential barrier at the thin-metal---superconductor interface, then the standard approach is found to be incorrect. We give the proper expansion for the tunneling current in this case.

Hamiltonian (control theory)

10.1103/physrevb.17.3576

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Citations (27)

Coherent organization of electronic correlations as a mechanism to enhance and stabilize high-T C cuprate superconductivity

Nature Communications (2017)

Haoxiang Li Xiaoqing Zhou Stephen Parham T. J. Reber H. Berger

Strong diffusive or incoherent electronic correlations are the signature of the strange-metal normal state of the cuprate superconductors, with these correlations considered to be undressed or removed in the superconducting state. A critical question is if these correlations are responsible for the high-temperature superconductivity. Here, utilizing a development in the analysis of angle-resolved photoemission data, we show that the strange-metal correlations don't simply disappear in the superconducting state, but are instead converted into a strongly renormalized coherent state, with stronger normal state correlations leading to stronger superconducting state renormalization. This conversion begins well above T

10.1038/s41467-017-02422-2

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Citations (37)

The superconducting phase boundary of bimetallic superlattices

Superlattices and Microstructures (1985)

Madhu Menon G. B. Arnold

Cooper pair

Bimetallic strip

Phase boundary

Critical field

10.1016/s0749-6036(85)80014-8

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Citations (14)

Transmission coefficient of a metal-metal interface in the tight-binding model

Physical review. B, Condensed matter (1982)

G. B. Arnold

We present a tight-binding-model calculation of the transmission coefficient for electrons incident upon the interface between two metals. The role of the coupling produced by overlap of wave functions of the two metals is elucidated. The existence of a critical angle analogous to the optical critical angle is demonstrated. The relevance of these results to proximity-effect tunneling experiments is discussed.

Transmission coefficient

Tight binding

10.1103/physrevb.25.5998

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Citations (6)

Superconducting tunneling without the tunneling Hamiltonian. II. Subgap harmonic structure

Journal of Low Temperature Physics (1987)

G. B. Arnold

Transmission coefficient

Hamiltonian (control theory)

Tunnel effect

10.1007/bf00682620

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Citations (153)

Electrical characterization of Nb/Al-oxide/Nb Josephson junctions with high critical current densities

IEEE Transactions on Applied Superconductivity (1995)

A. W. Kleinsasser W. H. Mallison Ronald E. Miller G. B. Arnold

Transport in Nb/AlO/sub x//Nb junctions involves two parallel channels, barrier defects (pinholes) with sub-nanometer dimensions and nearly-ideal tunneling regions. We fit junction characteristics using only a single parameter, the ratio of the normal state conductances of these current paths. Our barrier model accounts for the excellent Josephson behavior and highly non-ideal quasiparticle characteristics of junctions with critical current densities as high as 4 mA//spl mu/m/sup 2/. It appears to be quite generally applicable to tunnel junctions.< >

10.1109/77.403156

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Citations (16)

Bosonic mechanism for high-temperature

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (1991)

F. M. Mueller G. B. Arnold James C. Swihart

The temperature dependent photoemission data of D. S. Dessau et al. show strong modulations in the superconducting state when compared to the normal state. These are similar to but larger than those seen historically in standard tunneling experiments in lower temperature superconductors. We have analyzed the Dessau data using Nambu-Eliashberg theory assuming some (as yet unknown) boson exchange as the primary mechanism for the superconductivity. The derived {alpha}{sup 2}F's, {lambda}'s and {mu}*'s show features which resemble those derived from inversions of other low-temperature superconductors, albeit that {lambda} here is about 8.67 and {mu}* is approximately 0.15. Several bosonic mechanisms are considered. 29 refs., 3 figs.

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c-AXIS TWIST Bi₂Sr₂CaCu₂O_8+δ JOSEPHSON JUNCTIONS: A NEW PHASE-SENSITIVE TEST OF ORDER PARAMETER SYMMETRY

International Journal of Modern Physics B (1999)

Richard A. Klemm G. B. Arnold A. Bille C. T. Rieck K. Scharnberg

Li et al. found that the critical current density [Formula: see text] across atomically clean c-axis twist junctions of Bi 2 Sr 2 CaCu 2 O 8+δ is the same as that of the constituent single crystal, [Formula: see text], independent of the twist angle ϕ 0 , even at and below T c . We investigated theoretically if a d x 2 -y 2 -wave order parameter might twist by mixing in d xy -wave components, but found that such mixing cannot possibly explain the data near to T c . Combined with group theoretical arguments, we then conclude that the order parameter contains at least a substantial s-wave component, but does not contain any purported d x 2 -y 2 -wave compoenent, except possibly below a second, unobserved phase transition. By studying tunneling models, we further conclude that the intrinsic c-axis Josephson tunneling in Bi 2 Sr 2 CaCu 2 O 8+δ is likely to be most incoherent. We also propose a c-axis junction version of a tricrystal experiment, which does not rely upon expensive substrates.

Font

10.1142/s0217979299003192

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Citations (7)

Short-range correlations in magnetic systems: Effective-cluster approach

Physical review. B, Condensed matter (1988)

Gustavo Mata G. B. Arnold

We present a cluster method that allows the inclusion of short-range correlations into the calculation of the properties of magnetic systems described by a Heisenberg Hamiltonian. The system under consideration is broken up into clusters. The clusters are assumed to be uncorrelated and acted upon by an effective Hamiltonian which approximates the effect of intercluster interaction. The parameters of this effective Hamiltonian are chosen so as to find an optimal upper bound for the free energy. When the cluster consists of only one site we recover molecular-field theory. For the specific systems studied here we find that, for larger clusters, we can recast the method in a form which resembles mean-field theory. We use one-site, two-site, and four-site clusters to apply the method to the spin-(1/2 Heisenberg antiferromagnet on a square lattice. Our results are in agreement with direct diagonalization and Monte Carlo calculations in larger clusters.

Hamiltonian (control theory)

Uncorrelated

Square lattice

Coupled cluster

Heisenberg model

Lattice (music)

10.1103/physrevb.38.11582

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Citations (5)