Positron annihilation in InPb alloy single crystals

1991 ◽  
Vol 69 (5) ◽  
pp. 549-552
Author(s):  
K. T. Parker ◽  
A. T. Stewart
Keyword(s):  
Fermi Surface ◽  
Single Crystals ◽  
Positron Annihilation ◽  
Free Electron ◽  
Similar Model ◽  
Electron Theory

Electron momenta in Pb and PbIn alloys were measured by the positron annihilation technique. The distributions of momentum observed in single crystals of the specimens showed appreciable anisotropy. A model of the known Fermi surface of Pb near the (111) zone face was adjusted to fit the data. A similar model for the alloys was used to determine kF as a function of In concentration in the range 0 < In < 48 at.%. The results are remarkably like free electron theory.

Positron Annihilation with Core Electrons in the Noble Metals

1974 ◽  
Vol 52 (4) ◽  
pp. 336-339 ◽  
Author(s):  
E. H. Becker ◽  
A. G. Gould ◽  
E. M. D. Senicki ◽  
B. G. Hogg
Keyword(s):  
Simple Model ◽  
Fermi Surface ◽  
Single Crystals ◽  
Positron Annihilation ◽  
Angular Correlation ◽  
Noble Metals ◽  
Correlation Data ◽  
Core Electrons

Experimental angular correlation curves for identically oriented single crystals of copper, silver, and gold have been obtained using "a point geometry" apparatus. The differences between these angular correlation data are compared to the differences predicted using a simple model of the Fermi surface combined with calculations of the theoretical core distributions.

Positron Annihilation in Copper Single Crystals and Its Relevance to the Fermi Surface

1968 ◽  
Vol 20 (9) ◽  
pp. 448-450 ◽  
Author(s):  
D. Llewelyn Williams ◽  
Ernest H. Becker ◽  
Peter Petijevich ◽  
Garth Jones
Keyword(s):  
Fermi Surface ◽  
Single Crystals ◽  
Positron Annihilation ◽  
Copper Single Crystals

Properties of metallic NaxCo2O4 thermoelectric materials

2003 ◽  
Vol 793 ◽  
Author(s):  
Xiaofeng Tang ◽  
Terry M. Tritt ◽  
Ed Abbott ◽  
J. K. Kolis
Keyword(s):  
Thermal Conductivity ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Single Crystals ◽  
Thermoelectric Materials ◽  
Free Electron ◽  
Research Work ◽  
Electron Theory ◽  
New Synthesis ◽  
Theoretical Investigations

AbstractSince the quite favorable thermoelectric properties of transition-metal oxide NaCo2O4 were first reported by Terasaki in 1997, extensive research work has been conducted, including the efforts to improve TE properties through doping or new synthesis approaches. In addition, theoretical investigations about the enhanced thermopower coupled with the small resistivity values for the metallic NaxCo2O4 have been investigated. The advent of the large thermopower and low resistivity appears not able to be explained via conventional free-electron theory. In this paper, thermoelectric and magnetic properties, including resistivity, thermopower, thermal conductivity, magnetic susceptibility and moment of single crystals and polycrystalline NaxCo2O4 are reported. The effect of Na concentration on the transport properties will also be discussed.

A free-electron theory of conjugated molecules

1953 ◽  
Vol 49 (4) ◽  
pp. 650-658 ◽  
Author(s):  
J. Stanley Griffith
Keyword(s):  
Free Electron ◽  
Wave Functions ◽  
Electron Charge ◽  
Algebraic Equations ◽  
Electron Wave ◽  
Electron Theory ◽  
Conjugated Molecules ◽  
Electron Charge Density ◽  
Linear Polyenes ◽  
Alternant Hydrocarbons

ABSTRACTThe values of a free-electron eigenfunotion at the carbon nuclei of a conjugated hydrocarbon are found to satisfy a system of algebraic equations. These equations are similar in form to those obtained in the method known as the linear combination of atomic orbitale but only coincide with them for linear polyenes and benzene. The symmetry, degeneracy and energy of the eigenvectors of these free-electron equations correspond exactly to those of the free-electron wave functions found by the usual methods. From this correspondence, a theorem is deduced about the free-electron charge density in alternant hydrocarbons.

Extraction of Fermi-Surface Topologies in Layered Manganites from Spin-Dependent Positron Annihilation

2001 ◽  
Vol 363-365 ◽  
pp. 579-581
Author(s):  
Zs. Major ◽  
Stephen B. Dugdale ◽  
R.J. Hughes ◽  
I. Wilkinson ◽  
M.Ashraf Alam
Keyword(s):  
Fermi Surface ◽  
Positron Annihilation

Angular Correlation of Positron Annihilation Radiation from Single Crystals of Vanadium-Deuterium Alloys

1979 ◽  
Vol 46 (2) ◽  
pp. 481-487 ◽  
Author(s):  
Masayuki Hasegawa ◽  
Shu-ichi Koike ◽  
Makoto Hirabayashi ◽  
Hajime Asano ◽  
Toshiharu Suzuki
Keyword(s):  
Single Crystals ◽  
Positron Annihilation ◽  
Angular Correlation ◽  
Annihilation Radiation

Structural characterization of H plasma-doped ZnO single crystals by positron annihilation spectroscopies

2010 ◽  
Vol 207 (11) ◽  
pp. 2415-2425 ◽  
Author(s):  
Wolfgang Anwand ◽  
Gerhard Brauer ◽  
Thomas E. Cowan ◽  
Dieter Grambole ◽  
Wolfgang Skorupa ◽  
...  
Keyword(s):  
Single Crystals ◽  
Positron Annihilation ◽  
Structural Characterization ◽  
Doped Zno

scholarly journals Positron Annihilation Lifetime Analysis of Left- and Right-Handed Alanine Single Crystals

2017 ◽  
Vol 132 (5) ◽  
pp. 1456-1461 ◽  
Author(s):  
B. Eren ◽  
F. Wu ◽  
E. Eren ◽  
Y.C. Jean ◽  
J.D. Van Horn
Keyword(s):  
Single Crystals ◽  
Positron Annihilation ◽  
Positron Annihilation Lifetime ◽  
Lifetime Analysis ◽  
Left And Right

Positron annihilation in Al single crystals from 85 mK to 300K

1983 ◽  
Vol 13 (12) ◽  
pp. L265-L268 ◽  
Author(s):  
P J Schultz ◽  
A Vehanen ◽  
W Thomlinson ◽  
K G Lynn ◽  
I K MacKenzie
Keyword(s):  
Single Crystals ◽  
Positron Annihilation

Comparative characterization of differently grown ZnO single crystals by positron annihilation and Hall effect

2007 ◽  
Vol 42 (1-6) ◽  
pp. 259-264 ◽  
Author(s):  
G. Brauer ◽  
W. Anwand ◽  
W. Skorupa ◽  
J. Kuriplach ◽  
O. Melikhova ◽  
...  
Keyword(s):  
Hall Effect ◽  
Single Crystals ◽  
Positron Annihilation ◽  
Comparative Characterization
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