Investigation of condensed matter via resonant neutron scattering. Correlation-function formalism with application to the study of the interatomic force density

1981 ◽  
Vol 24 (5) ◽  
pp. 2430-2448 ◽  
Author(s):  
R. E. Word ◽  
G. T. Trammell
Keyword(s):  
Correlation Function ◽  
Neutron Scattering ◽  
Condensed Matter ◽  
Force Density ◽  
Interatomic Force ◽  
Function Formalism

scholarly journals QUANTUM GLOBAL STRINGS AND THEIR CORRELATION FUNCTIONS

2000 ◽  
Vol 15 (15) ◽  
pp. 2225-2235 ◽  
Author(s):  
H. FORT ◽  
E. C. MARINO
Keyword(s):  
Correlation Function ◽  
Energy Density ◽  
Correlation Functions ◽  
Potential Application ◽  
Cosmic Strings ◽  
Condensed Matter ◽  
Higgs Field ◽  
Basic Field ◽  
Dual Formulation ◽  
Full Quantum

A full quantum description of global vortex strings is presented in the framework of a pure Higgs system with a broken global U(1) symmetry in 3+1D. An explicit expression for the string creation operator is obtained, both in terms of the Higgs field and in the dual formulation where a Kalb–Ramond antisymmetric tensor gauge field is employed as the basic field. The quantum string correlation function is evaluated and from this, the string energy density is obtained. Potential application in cosmology (cosmic strings) and condensed matter (vortices in superfluids) are discussed.

Structure Investigations on Se1-xTex Melts by Neutron Scattering and X-ray Diffraction

1981 ◽  
Vol 36 (8) ◽  
pp. 880-885 ◽  
Author(s):  
W. Hoyer ◽  
B. Kunsch ◽  
M. Suda ◽  
E. Wieser
Keyword(s):  
Correlation Function ◽  
Neutron Scattering ◽  
Diffraction Data ◽  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nearest Neighbours ◽  
Structure Investigations

Abstract Neutron scattering results on Se1-xTex melts (x = 0.3, 0.6, 0.8) obtained at 460 °C are combined with earlier X-ray diffraction data. The behaviour of the number and distance of nearest neighbours is discussed with respect to chemical short-range order and transition from twofold to three-fold coordination. For Se70Te30 the radial concentration correlation function 4πr2 ρcc(r) has been evaluated. It shows clearly the preferred formation of unlike pairs (Se-Te) within the chains.

The Application of the Memory-Function Formalism to Dielectric Relaxation

1980 ◽  
Vol 35 (11) ◽  
pp. 1207-1217
Author(s):  
P. Bordewijk
Keyword(s):  
Correlation Function ◽  
Dielectric Relaxation ◽  
Single Molecule ◽  
Rotational Diffusion ◽  
Memory Function ◽  
Dielectric Relaxation Time ◽  
Function Formalism ◽  
Correlation Theorem ◽  
Dipole Correlation ◽  
Rotational Diffusion Coefficient

Abstract The application of the memory-function formalism to dielectric relaxation is reconsidered. It is shown that the so-called Corresponding Micro-Macro Correlation theorem is not valid and that for a single macroscopic dielectric relaxation time, the single-molecule dipole correlation function may nevertheless be non-exponential. The deviations from the exponential decay for the single-molecule dipole correlation function are due to spatially dependent orientational correlations, and can at least partly be interpreted in terms of dielectric friction. The unsureness about these correlations implies that it is simpler to determine the rotational diffusion coefficient from the collective orientation correlation time as determined from dielectric measurements than from the single-molecule dipole correlation function as obtained from infrared spectroscopy.

Correlation function formalism for the intrinsic viscosity of polymers

1974 ◽  
Vol 61 (11) ◽  
pp. 4535-4539 ◽  
Author(s):  
Hiromi Yamakawa ◽  
Genzo Tanaka ◽  
W. H. Stockmayer
Keyword(s):  
Correlation Function ◽  
Intrinsic Viscosity ◽  
Function Formalism
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