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Physical Review Letters

Volume 72, Issue 7

14 February 1994
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LETTERS

General Physics

New type of gap soliton in a coupled Korteweg–de Vries wave system

Roger Grimshaw and Boris A. Malomed

Phys. Rev. Lett. 72, 949 (1994) - Published 14 February, 1994

S matrix as geometric phase factor

Roger G. Newton

Phys. Rev. Lett. 72, 954 (1994) - Published 14 February, 1994

Gravitation and Astrophysics

Black hole entropy and the dimensional continuation of the Gauss-Bonnet theorem

Máximo Bañados, Claudio Teitelboim, and Jorge Zanelli

Phys. Rev. Lett. 72, 957 (1994) - Published 14 February, 1994

Elementary Particles and Fields

Observation of an excited state of the Λc+ baryon

P. L. Frabetti et al.

Phys. Rev. Lett. 72, 961 (1994) - Published 14 February, 1994

First generation leptoquark search in pp¯ collisions at √s =1.8 TeV

S. Abachi et al.

Phys. Rev. Lett. 72, 965 (1994) - Published 14 February, 1994

Coherent pion radiation from nucleon-antinucleon annihilation

R. D. Amado, F. Cannata, J.-P. Dedonder, M. P. Locher, and Bin Shao

Phys. Rev. Lett. 72, 970 (1994) - Published 14 February, 1994

Radiative decay of the Δ resonance: Analyzing powers for π−p→→γn

J. C. Staško, B. Bassalleck, E. C. Booth, M. B. Chertok, D. Healey, R. Jacot-Guillarmod, M. A. Kovash, D. J. Mack, D. F. Measday, J. P. Miller, M. A. Moinester, D. Ottewell, M. A. Pickar, and P. Weber

Phys. Rev. Lett. 72, 973 (1994) - Published 14 February, 1994

Nuclear Physics

Transverse momentum distributions of η mesons in near-threshold relativistic heavy ion reactions

F.-D. Berg, M. Pfeiffer, O. Schwalb, M. Franke, W. Kühn, H. Löhner, V. Metag, M. Notheisen, R. Novotny, A. E. Raschke, J. Ritman, M. Röbig-Landau, R. S. Simon, M. Šumbera, L. Venema, and H. Wilschut

Phys. Rev. Lett. 72, 977 (1994) - Published 14 February, 1994

Nuclear shell structure at particle drip lines

J. Dobaczewski, I. Hamamoto, W. Nazarewicz, and J. A. Sheikh

Phys. Rev. Lett. 72, 981 (1994) - Published 14 February, 1994

Atomic, Molecular, and Optical Physics

Reductions, relative equilibria, and bifurcations in the generalized van der Waals potential: Relation to the integrable cases

Antonio Elipe and Sebastián Ferrer

Phys. Rev. Lett. 72, 985 (1994) - Published 14 February, 1994

Correlation of high-frequency phase fluctuations in electromagnetically induced transparency

Michael Fleischhauer

Phys. Rev. Lett. 72, 989 (1994) - Published 14 February, 1994

Demonstration of a novel atomic beam splitter

John Lawall and Mara Prentiss

Phys. Rev. Lett. 72, 993 (1994) - Published 14 February, 1994

Momentum transfer in laser-cooled cesium by adiabatic passage in a light field

Lori S. Goldner, C. Gerz, R. J. C. Spreeuw, S. L. Rolston, C. I. Westbrook, W. D. Phillips, P. Marte, and P. Zoller

Phys. Rev. Lett. 72, 997 (1994) - Published 14 February, 1994

Two-photon spectroscopy of odd-parity states

D. Fröhlich, M. Itoh, and Ch. Pahlke-Lerch

Phys. Rev. Lett. 72, 1001 (1994) - Published 14 February, 1994

Nonlinear Dynamics, Fluid Dynamics, Classical Optics, Etc.

Geometric phases and hidden symmetries in simple resonators

H.-M. Lauber, P. Weidenhammer, and D. Dubbers

Phys. Rev. Lett. 72, 1004 (1994) - Published 14 February, 1994

Vortices in random wave fields: Nearest neighbor anticorrelations

Natalya Shvartsman and Isaac Freund

Phys. Rev. Lett. 72, 1008 (1994) - Published 14 February, 1994

Dynamic spatial solitons

A. W. Snyder, S. J. Hewlett, and D. J. Mitchell

Phys. Rev. Lett. 72, 1012 (1994) - Published 14 February, 1994

Anomalous scaling of a randomly advected passive scalar

Robert H. Kraichnan

Phys. Rev. Lett. 72, 1016 (1994) - Published 14 February, 1994

Plasma and Beam Physics

Scaling behavior and self-organization in plasma turbulence

P. Tham and A. K. Sen

Phys. Rev. Lett. 72, 1020 (1994) - Published 14 February, 1994

Experimental observations of the expansion of an optical-field-induced ionization channel in a gas jet target

M. Dunne, T. Afshar-Rad, J. Edwards, A. J. MacKinnon, S. M. Viana, O. Willi, and G. Pert

Phys. Rev. Lett. 72, 1024 (1994) - Published 14 February, 1994

Measurement of magnetic fluctuation induced energy transport

G. Fiksel, S. C. Prager, W. Shen, and M. R. Stoneking

Phys. Rev. Lett. 72, 1028 (1994) - Published 14 February, 1994

Condensed Matter: Structure, Etc.

Surface resonance scattering of high energy electrons

S. L. Dudarev and M. J. Whelan

Phys. Rev. Lett. 72, 1032 (1994) - Published 14 February, 1994

Cooperative self-assembly of Au atoms and C60 on Au(110) surfaces

J. K. Gimzewski, S. Modesti, and R. R. Schlittler

Phys. Rev. Lett. 72, 1036 (1994) - Published 14 February, 1994

Kinetic energy and condensate fraction in −43He mixtures

Y. Wang and P. E. Sokol

Phys. Rev. Lett. 72, 1040 (1994) - Published 14 February, 1994

Gap opening in ultrathin Si layers: Role of confined and interface states

Stefano Ossicini, A. Fasolino, and F. Bernardini

Phys. Rev. Lett. 72, 1044 (1994) - Published 14 February, 1994

Condensed Matter: Electronic Properties, Etc.

Semiclassical solution of one dimensional model of Kondo insulator

A. M. Tsvelik

Phys. Rev. Lett. 72, 1048 (1994) - Published 14 February, 1994

Phonon-mediated attraction between large bipolarons: Condensation to a liquid

David Emin

Phys. Rev. Lett. 72, 1052 (1994) - Published 14 February, 1994

Density of states of localized phonons in a pinned Wigner crystal

I. L. Aleiner and I. M. Ruzin

Phys. Rev. Lett. 72, 1056 (1994) - Published 14 February, 1994

Anomalous classical diffusion of high mobility 2D electron gas in magnetic field

B. Laikhtman

Phys. Rev. Lett. 72, 1060 (1994) - Published 14 February, 1994

2-channel Kondo scaling in conductance signals from 2 level tunneling systems

D. C. Ralph, A. W. W. Ludwig, Jan von Delft, and R. A. Buhrman

Phys. Rev. Lett. 72, 1064 (1994) - Published 14 February, 1994

Identical scaling behavior of dc and ac response near the percolation threshold in conductor-insulator mixtures

K. K. Bardhan and R. K. Chakrabarty

Phys. Rev. Lett. 72, 1068 (1994) - Published 14 February, 1994

Highly spin-polarized, nearly free-electron states in front of Co(101¯0)

Sven Bode, Kai Starke, Peter Rech, and Günter Kaindl

Phys. Rev. Lett. 72, 1072 (1994) - Published 14 February, 1994

Charging effects in ultrasmall quantum dots in the presence of time-varing fields

C. Bruder and H. Schoeller

Phys. Rev. Lett. 72, 1076 (1994) - Published 14 February, 1994

Corrections to scaling in the integer quantum Hall effect

Bodo Huckestein

Phys. Rev. Lett. 72, 1080 (1994) - Published 14 February, 1994

Symmetry of the superconducting order parameter in a YBa2Cu3O7−δ epitaxial films

P. Chaudhari and Shawn-Yu Lin

Phys. Rev. Lett. 72, 1084 (1994) - Published 14 February, 1994

Suppression of the first order vortex melting transition by intrinsic pinning in YBa2Cu3O7−δ

W. K. Kwok, J. Fendrich, U. Welp, S. Fleshler, J. Downey, and G. W. Crabtree

Phys. Rev. Lett. 72, 1088 (1994) - Published 14 February, 1994

Vortex liquid disorder and the first order melting transition in YBa2Cu3O7−δ

W. K. Kwok, J. Fendrich, S. Fleshler, U. Welp, J. Downey, and G. W. Crabtree

Phys. Rev. Lett. 72, 1092 (1994) - Published 14 February, 1994

Spin correlations in the 2D Heisenberg antiferromagnet Sr2CuO2Cl2: Neutron scattering, Monte Carlo simulation, and theory

M. Greven, R. J. Birgeneau, Y. Endoh, M. A. Kastner, B. Keimer, M. Matsuda, G. Shirane, and T. R. Thurston

Phys. Rev. Lett. 72, 1096 (1994) - Published 14 February, 1994

Vogel-Fulcher relationship for the dielectric permittivity of relaxor ferroelectrics

A. K. Tagantsev

Phys. Rev. Lett. 72, 1100 (1994) - Published 14 February, 1994

Spatially indirect excitons as primary photoexcitations in conjugated polymers

M. Yan, L. J. Rothberg, F. Papadimitrakopoulos, M. E. Galvin, and T. M. Miller

Phys. Rev. Lett. 72, 1104 (1994) - Published 14 February, 1994

Observation of vacancy charge states in Cd0.2Hg0.8Te by positron annihilation

C. D. Smith, P. Rice-Evans, and N. Shaw

Phys. Rev. Lett. 72, 1108 (1994) - Published 14 February, 1994

Induced spin polarization in Cu spacer layers in Co/Cu multilayers

M. G. Samant, J. Stöhr, S. S. P. Parkin, G. A. Held, B. D. Hermsmeier, F. Herman, M. Van Schilfgaarde, L.-C. Duda, D. C. Mancini, N. Wassdahl, and R. Nakajima

Phys. Rev. Lett. 72, 1112 (1994) - Published 14 February, 1994

Supression of electron-induced positive ion emission by a molecular overlayer: Ion-molecule charge exchange at a surface

Ulrike Diebold and Theodore E. Madey

Phys. Rev. Lett. 72, 1116 (1994) - Published 14 February, 1994

Cross-Disciplinary Physics

Nonlocal contour dynamics model for chemical front motion

Dean M. Petrich and Raymond E. Goldstein

Phys. Rev. Lett. 72, 1120 (1994) - Published 14 February, 1994

Quantum and thermal effects in H2 dissociative adsorption: Evaluation of free energy barriers in multidimensional quantum systems

Greg Mills and Hannes Jónsson

Phys. Rev. Lett. 72, 1124 (1994) - Published 14 February, 1994

COMMENTS

Comment on ‘‘Quantum contact in gold nanostructures by scanning tunneling microscopy’’

H. J. Mamin and D. Rugar

Phys. Rev. Lett. 72, 1128 (1994) - Published 14 February, 1994

Pascual et al. reply

J. I. Pascual, J. Méndez, J. Gómez-Herrero, A. M. Baró, N. García, and Vu Thien Binh

Phys. Rev. Lett. 72, 1129 (1994) - Published 14 February, 1994

Bond length of Ge dimers at Si(001)

P. Krüger and J. Pollmann

Phys. Rev. Lett. 72, 1130 (1994) - Published 14 February, 1994

Fontes, Patel, and Comin reply

E. Fontes, J. R. Patel, and F. Comin

Phys. Rev. Lett. 72, 1131 (1994) - Published 14 February, 1994

Comment on ‘‘Universal trends in extreme type-II superconductors’’

D. R. Harshman and A. T. Fiory

Phys. Rev. Lett. 72, 1132 (1994) - Published 14 February, 1994

Schneider and Keller reply

T. Schneider and H. Keller

Phys. Rev. Lett. 72, 1133 (1994) - Published 14 February, 1994

Effect of nuclear spins on quantum tunneling of magnetization

Eugene M. Chudnovsky

Phys. Rev. Lett. 72, 1134 (1994) - Published 14 February, 1994

Garg replies

Anupam Garg

Phys. Rev. Lett. 72, 1135 (1994) - Published 14 February, 1994

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