High-pressure system for Compton scattering experiments

1998 ◽  
Vol 5 (3) ◽  
pp. 932-934 ◽  
Author(s):  
G. Oomi ◽  
F. Honda ◽  
T. Kagayama ◽  
F. Itoh ◽  
H. Sakurai ◽  
...  
Keyword(s):  
High Pressure ◽  
Synchrotron Radiation ◽  
Compton Scattering ◽  
Compton Profile ◽  
Pressure System ◽  
Electron Model ◽  
Conduction Electrons ◽  
Free Electron Model ◽  
High Pressure Apparatus ◽  
Good Agreement

High-pressure apparatus for Compton scattering experiments has been developed to study the momentum distribution of conduction electrons in metals and alloys at high pressure. This apparatus was applied to observe the Compton profile of metallic Li under pressure. It was found that the Compton profile at high pressure could be obtained within several hours by using this apparatus and synchrotron radiation. The result on the pressure dependence of the Fermi momentum of Li obtained here is in good agreement with that predicted from the free-electron model.

A Multi-Anvil High Pressure System with Synchrotron X-Ray Probe: New Opportunities for In-Situ Materials Research at Simultaneously High Pressure and Temperature

1997 ◽  
Vol 499 ◽  
Author(s):  
Y. Wang ◽  
G. Shen ◽  
M. Rivers ◽  
S. Sutton
Keyword(s):  
High Pressure ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
Pressure System ◽  
High Pressure And Temperature ◽  
High Pressure High Temperature ◽  
Materials Research ◽  
Photon Source ◽  
High Pressure Apparatus

ABSTRACTWe describe the multi-anvil, large-volume, high-pressure facility that is being constructed at the GeoSoilEnviroCARS (Sector 13) at the Advanced Photon Source, Argonne National Laboratory. Various multi-anvil, high-pressure apparatus will be used to cover pressure and temperature conditions up to 40 GPa and 3000 °C, respectively, with milimeter to centimeter sized samples. This national facility is open to all users, providing excellent opportunities for high pressure, high temperature experiments.

Electronic Structure of Gadolinium and Dysprosium Using Compton Scattering Technique

2006 ◽  
Vol 61 (5-6) ◽  
pp. 299-305
Author(s):  
Shabha Khera ◽  
Narayan Lal Heda ◽  
Sonal Mathur ◽  
Babu Lal Ahuja
Keyword(s):  
Electronic Structure ◽  
Compton Scattering ◽  
Gamma Rays ◽  
Free Electron ◽  
Cohesive Energy ◽  
Electron Model ◽  
Free Electron Model ◽  
Scattering Technique ◽  
Derivatives Of

In this paper we present the first ever measured Compton profiles of polycrystalline gadolinium and dysprosium using 661.65 keV gamma-rays. The Compton data are compared with renormalized-freeatom (RFA) and free-electron model profiles. In both cases the RFA model (with e− - e− correlation) gives a better agreement with the experiment. The hybridization effects of s-, p-, d-, and f-electrons are discussed, using the first derivatives of the Compton profiles. We also report the cohesive energy of both samples, computed from the RFA calculations. - PACS numbers: 13.60.F, 71.15.Nc, 78.70. -g, 78.70.Ck

Theory of neutron scattering by conduction electrons in a metal and on the collective-electron model of a ferromagnet

1956 ◽  
Vol 235 (1202) ◽  
pp. 289-304 ◽  
Keyword(s):  
Cross Sections ◽  
Magnetic Scattering ◽  
Simple Metal ◽  
Electron Model ◽  
Band Theory ◽  
Total Cross Sections ◽  
Conduction Electrons ◽  
Comparison With Experiment ◽  
Free Electron Model ◽  
Simplifying Assumptions

The cross-sections are studied for the magnetic scattering of slow neutrons by metallic electrons whose energy states are described by band theory. It is found that both electron spin and current contribute to the scattering. With the aid of certain simplifying assumptions numerical results are obtained for two cases, the free-electron model of a simple metal like sodium, and the collective-electron model of a ferromagnet with particular reference to specific experimental data on iron. Scattering takes place over wide angles and is very weak, although total cross-sections may be of the order of millibarns. Unfortunately, therefore, this technique cannot at present give much information about the electrons. The predictions of the collective-electron model of a ferromagnet are of importance for comparison with experiment and the predictions of the other models. It is here contrasted in detail with the spin-wave predictions.

Sign in / Sign up

Export Citation Format

Share Document