The effect of hydrostatic pressure on the Fermi surface of white tin

1979 ◽  
Vol 57 (6) ◽  
pp. 884-889 ◽  
Author(s):  
J. M. Perz ◽  
I. M. Templeton
Keyword(s):  
Hydrostatic Pressure ◽  
Fermi Surface ◽  
Cross Sectional ◽  
Indirect Methods ◽  
Comprehensive Determination ◽  
Shift Technique ◽  
Direct And Indirect Methods ◽  
The Magnetic Field

The derivatives with respect to hydrostatic pressure of 12 extremal cross-sectional areas of the Fermi surface of tetragonal white (β) tin have been measured by the fluid helium de Haas van Alphen phase shift technique. The samples were carefully aligned in situ to have a crystal symmetry axis ([001], [100], or [110]) parallel to the magnetic field. The measured derivatives differ significantly from most values found previously by both direct and indirect methods; it is believed that the present work provides the first reliable comprehensive determination of these quantities. The present experiments also confirm the conclusions of magnetostriction experiments that there is a second orbit normal to [100] on the sixth zone surface not identified in earlier conventional de Haas van Alphen work, and that the third zone extremal areas normal to [001] are larger than previously accepted values determined in de Haas van Alphen studies.

Hydrostatic pressure dependence of the Fermi surface of rhenium

1980 ◽  
Vol 58 (2) ◽  
pp. 194-199 ◽  
Author(s):  
J. M. Perz ◽  
I. V. Svechkarev ◽  
I. M. Templeton
Keyword(s):  
Magnetic Field ◽  
Hydrostatic Pressure ◽  
Phase Shift ◽  
Fermi Surface ◽  
Symmetry Axis ◽  
Magnetic Field Direction ◽  
Cross Sectional ◽  
Shift Technique ◽  
The Magnetic Field

The derivatives with respect to hydrostatic pressure of nine extremal cross-sectional areas of the Fermi surface of the hexagonal transition metal rhenium have been measured by the fluid helium de Haas van Alphen phase shift technique. The samples were carefully aligned in situ to have a crystal symmetry axis ([0001] or [Formula: see text]) parallel to the magnetic field direction, in order to minimize spurious effects which might be produced by tilting of the sample; precise values of the de Haas van Alphen frequencies have been measured for these symmetry directions. With the field along [0001], oscillations have been observed that correspond to a branch which appeared to vanish near this direction in previous de Haas van Alphen studies. Clear evidence has been observed of the degeneracy along the A–L line on the hexagonal face of the Brillouin zone.

Determination of Silkworm Silk Fibroin Compressibility Using High Hydrostatic Pressure with in Situ X-ray Microdiffraction

2014 ◽  
Vol 47 (20) ◽  
pp. 7187-7193 ◽  
Author(s):  
Christina Krywka ◽  
Igor Krasnov ◽  
Roxana Figuli ◽  
Manfred Burghammer ◽  
Martin Müller
Keyword(s):  
Hydrostatic Pressure ◽  
Silk Fibroin ◽  
High Hydrostatic Pressure ◽  
X Ray ◽  
Silkworm Silk

Hydrostatic pressure and uniaxial stress derivatives of the Fermi surface of rhenium

1983 ◽  
Vol 61 (10) ◽  
pp. 1428-1433 ◽  
Author(s):  
J. R. Anderson ◽  
F. W. Holroyd ◽  
J. M. Perz ◽  
J. E. Schirber ◽  
I. M. Templeton
Keyword(s):  
Transition Temperature ◽  
Hydrostatic Pressure ◽  
Fermi Surface ◽  
Cross Sections ◽  
Solid Helium ◽  
Uniaxial Stress ◽  
Superconducting Transition ◽  
Cross Sectional ◽  
Effective Masses ◽  
Derivatives Of

Derivatives with respect to hydrostatic pressure of extremal cross-sectional areas normal to [Formula: see text] of all closed sheets of the Fermi surface of rhenium have been determined by both fluid–helium and solid–helium phase shift techniques. Precise values of de Haas–van Alphen frequencies and effective masses have also been measured for these cross sections. In addition, uniaxial stress derivatives of the zone seven cross sections have been deduced from quantum oseillations in magnetostriction and torque. Previously observed anomalies in the pressure dependence of the superconducting transition temperature are interpreted in terms of the present results.

Determination of cross-sectional area of natural plant fibres and fibre failure analysis by in situ SEM observation during microtensile tests

Cellulose ◽  
2019 ◽  
Vol 26 (8) ◽  
pp. 4693-4706 ◽  
Author(s):  
Hangbo Yue ◽  
Juan C. Rubalcaba ◽  
Yingde Cui ◽  
Juan P. Fernández-Blázquez ◽  
Chufen Yang ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Natural Plant ◽  
Fibre Failure ◽  
Sem Observation

scholarly journals A Comparison of Direct and Indirect Methods of Determination of Stellar Angular Diameters

1985 ◽  
Vol 111 ◽  
pp. 459-461
Author(s):  
L. Pastori ◽  
L. E. Pasinetti ◽  
E. Antonello
Keyword(s):  
Detailed Comparison ◽  
Main Difficulty ◽  
Indirect Methods ◽  
Code Number ◽  
Methods Of Determination ◽  
The Past ◽  
Direct And Indirect Methods ◽  
Hr Diagram ◽  
Angular Diameters

Several direct and indirect methods for the determination of stellar apparent diameters have been developed in the past; they are summarized in Table 1 by Fracassini, et al. (1981) with a code number and references. So far, no detailed comparison of the methods has been carried out, the main difficulty being the extremely small number of common stars. Nevertheless, from the stars listed in CADARS (Fracassini, et al. 1981), we have obtained some correlations in order to test the reliability of some methods and to define the regions of the HR diagram where they can be applied.

Uniaxial strain dependence of the Fermi surface of tungsten

1977 ◽  
Vol 55 (4) ◽  
pp. 344-355 ◽  
Author(s):  
D. J. Stanley ◽  
J. M. Perz ◽  
M. J. G. Lee ◽  
R. Griessen
Keyword(s):  
Fermi Surface ◽  
Uniaxial Stress ◽  
Cross Sectional ◽  
Quantum Oscillations ◽  
Scattering Phase ◽  
Point Determination ◽  
Derivatives Of ◽  
Homogeneous Strain ◽  
Good Agreement

The derivatives of five representative cross sectional areas of the Fermi surface of tungsten with respect to uniaxial stress and strain along the cube axes, are determined experimentally from simultaneous measurements of quantum oscillations in magnetostriction and torque, and also in sound velocity and torque. The results are resolved into two components, the dependence on volume-conserving tetragonal shear, and the dependence on isotropic dilation. The tetragonal shear dependence is found to be in generally good agreement with the results of KKR calculations based on a fit to the unstrained Fermi surface. The isotropic dilation dependence agrees well with hydrostatic pressure measurements; from these results, the volume derivatives of the scattering phase shifts are deduced. This work is the first step towards a point-by-point determination of the distortion of the Fermi surface of tungsten in a lattice subjected to an arbitrary homogeneous strain.

scholarly journals In vivo determination of body composition by tritium dilution in the rat

1979 ◽  
Vol 41 (3) ◽  
pp. 625-628 ◽  
Author(s):  
Nancy J. Rothwell ◽  
M. J. Stock
Keyword(s):  
Body Water ◽  
Female Rats ◽  
Indirect Methods ◽  
Male And Female ◽  
Male And Female Rats ◽  
Significant Difference ◽  
Total Body ◽  
Direct And Indirect Methods

Total body water was determined in vivo by tritium dilution in thirty-two male and female rats. Body water obtained by tritium dilution and body fat calculated from this value correlated significantly with body water and fat obtained by analysis (r 0.985, 0.855 respectively). There was no significant difference between values for fat assessed by the direct and indirect methods.

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