Volume 66, Issue 17

29 April 1991

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LETTERS

Gravitation and Astrophysics

Cosmic-structure constraints from a one-degree microwave-background anisotropy experiment

J. R. Bond, G. Efstathiou, P. M. Lubin, and P. R. Meinhold

Phys. Rev. Lett. 66, 2179 (1991) - Published 29 April, 1991

Elementary Particles and Fields

Calculation of screening in a hot plasma

Eric Braaten and Tzu Chiang Yuan

Phys. Rev. Lett. 66, 2183 (1991) - Published 29 April, 1991

u- and d-quark masses in Nambu’s BCS model

Bipin R. Desai

Phys. Rev. Lett. 66, 2187 (1991) - Published 29 April, 1991

Upper limit on the branching ratio for the decay $π^{0}$ →νν¯

M. S. Atiya et al.

Phys. Rev. Lett. 66, 2189 (1991) - Published 29 April, 1991

Nuclear Physics

Analyzing powers for pion charge exchange on polarized ${}^{13}C$

J. J. Görgen et al.

Phys. Rev. Lett. 66, 2193 (1991) - Published 29 April, 1991

Atomic, Molecular, and Optical Physics

Two-photon bremsstrahlung of free atoms

Rainer Hippler

Phys. Rev. Lett. 66, 2197 (1991) - Published 29 April, 1991

Higher-order harmonic generation in xenon at 1064 nm: The role of phase matching

A. L’Huillier, K. J. Schafer, and K. C. Kulander

Phys. Rev. Lett. 66, 2200 (1991) - Published 29 April, 1991

Nonlinear Dynamics, Fluid Dynamics, Classical Optics, Etc.

Instability criteria for the flow of an inviscid incompressible fluid

Susan Friedlander and Misha M. Vishik

Phys. Rev. Lett. 66, 2204 (1991) - Published 29 April, 1991

Exact treatment of Poisson’s equation in solids with space-filling cells

A. Gonis, Erik C. Sowa, and P. A. Sterne

Phys. Rev. Lett. 66, 2207 (1991) - Published 29 April, 1991

Condensed Matter: Structure, Etc.

Knottedness in ring polymers

Kleanthes Koniaris and M. Muthukumar

Phys. Rev. Lett. 66, 2211 (1991) - Published 29 April, 1991

Phase separation of asymmetric binary hard-sphere fluids

Thierry Biben and Jean-Pierre Hansen

Phys. Rev. Lett. 66, 2215 (1991) - Published 29 April, 1991

Cu cluster shell structure at elevated temperatures

O. B. Christensen, K. W. Jacobsen, J. K. Nørskov, and M. Manninen

Phys. Rev. Lett. 66, 2219 (1991) - Published 29 April, 1991

High-resolution x-ray-diffraction spectra of Thue-Morse GaAs-AlAs heterostructures: Towards a novel description of disorder

Françoise Axel and Hikaru Terauchi

Phys. Rev. Lett. 66, 2223 (1991) - Published 29 April, 1991

Scaling of the (√3 × √3 )R30° domain-size distribution with coverage for Ag/Si(111)

J.-K. Zuo and J. F. Wendelken

Phys. Rev. Lett. 66, 2227 (1991) - Published 29 April, 1991

Condensed Matter: Electronic Properties, Etc.

Optical spectroscopy of field-induced charge in poly(3-hexyl thienylene) metal-insulator-semiconductor structures: Evidence for polarons

K. E. Ziemelis, A. T. Hussain, D. D. C. Bradley, R. H. Friend, J. Rühe, and G. Wegner

Phys. Rev. Lett. 66, 2231 (1991) - Published 29 April, 1991

Electronic and structural characterization of underpotentially deposited submonolayers and monolayer of copper on gold (111) studied by in situ x-ray-absorption spectroscopy

A. Tadjeddine, D. Guay, M. Ladouceur, and G. Tourillon

Phys. Rev. Lett. 66, 2235 (1991) - Published 29 April, 1991

Auger recombination within Landau levels in a two-dimensional electron gas

M. Potemski, R. Stepniewski, J. C. Maan, G. Martinez, P. Wyder, and B. Etienne

Phys. Rev. Lett. 66, 2239 (1991) - Published 29 April, 1991

Intrinsic electron accumulation layers on reconstructed clean InAs(100) surfaces

M. Noguchi, K. Hirakawa, and T. Ikoma

Phys. Rev. Lett. 66, 2243 (1991) - Published 29 April, 1991

Fermi-Dirac distribution of excitons in coupled quantum wells

J. A. Kash, M. Zachau, E. E. Mendez, J. M. Hong, and T. Fukuzawa

Phys. Rev. Lett. 66, 2247 (1991) - Published 29 April, 1991

Origin of spin-dependent asymmetries in electron transmission through ultrathin ferromagnetic films

M. P. Gokhale and D. L. Mills

Phys. Rev. Lett. 66, 2251 (1991) - Published 29 April, 1991

Resistance anomaly near the superconducting transition temperature in short aluminum wires

P. Santhanam, C. C. Chi, S. J. Wind, M. J. Brady, and J. J. Bucchignano

Phys. Rev. Lett. 66, 2254 (1991) - Published 29 April, 1991

Fermi surface and dynamics of the t-J model at moderate doping

Walter Stephan and Peter Horsch

Phys. Rev. Lett. 66, 2258 (1991) - Published 29 April, 1991

Small-polaron theory of doped antiferromagnets

Assa Auerbach and Brond E. Larson

Phys. Rev. Lett. 66, 2262 (1991) - Published 29 April, 1991

Skyrmion ground states in the presence of localizing potentials in weakly doped ${CuO}_{2}$ planes

R. J. Gooding

Phys. Rev. Lett. 66, 2266 (1991) - Published 29 April, 1991

Translational and bond-orientational order in the vortex lattice of the high- $T_{c}$ superconductor ${Bi}_{2.1}$ ${Sr}_{1.9}$ ${Ca}_{0.9}$ ${Cu}_{2}$ $O_{8 + δ}$

D. G. Grier, C. A. Murray, C. A. Bolle, P. L. Gammel, D. J. Bishop, D. B. Mitzi, and A. Kapitulnik

Phys. Rev. Lett. 66, 2270 (1991) - Published 29 April, 1991

Cross-Disciplinary Physics

Universal limit of spiral wave propagation in excitable media

Alain Karma

Phys. Rev. Lett. 66, 2274 (1991) - Published 29 April, 1991

COMMENTS

Comment on ‘‘Topological glass transition in entangled flux state’’

E. H. Brandt and A. Sudbø

Phys. Rev. Lett. 66, 2278 (1991) - Published 29 April, 1991

Obukhov and Rubinstein reply

S. P. Obukhov and Michael Rubinstein

Phys. Rev. Lett. 66, 2279 (1991) - Published 29 April, 1991

Comment on ‘‘Zeeman effect on magnetoresistance in high-temperature superconductors’’

R. S. Thompson

Phys. Rev. Lett. 66, 2280 (1991) - Published 29 April, 1991