scholarly journals Relationship between phonons and thermal expansion in Zn(CN)2and Ni(CN)2from inelastic neutron scattering andab initiocalculations

2011 ◽  
Vol 83 (2) ◽  
Author(s):  
R. Mittal ◽  
M. Zbiri ◽  
H. Schober ◽  
E. Marelli ◽  
S. J. Hibble ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron

scholarly journals Investigating anomalous thermal expansion of copper halides by inelastic neutron scattering and ab initio phonon calculations

2017 ◽  
Vol 19 (19) ◽  
pp. 12107-12116 ◽  
Author(s):  
Abhijith M. Gopakumar ◽  
M. K. Gupta ◽  
R. Mittal ◽  
S. Rols ◽  
S. L. Chaplot
Keyword(s):  
Thermal Expansion ◽  
Neutron Scattering ◽  
Ab Initio ◽  
Acoustic Phonon ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Volume Dependence ◽  
Transverse Acoustic ◽  
Anomalous Thermal Expansion ◽  
Copper Halides

The volume dependence of the frequency of the soft transverse acoustic phonon explains the anomalous thermal expansion in CuX.

INVAR BEHAVIOR OF FCC FeNi BULK AND FILMS: A COMPARISON

1993 ◽  
Vol 07 (01n03) ◽  
pp. 670-674 ◽  
Author(s):  
E.F. WASSERMANN ◽  
G. DUMPICH ◽  
U. KIRSCHBAUM ◽  
J. LIANG
Keyword(s):  
Thermal Expansion ◽  
Neutron Scattering ◽  
Spin Wave ◽  
Inelastic Neutron Scattering ◽  
Magnetic Behavior ◽  
Inelastic Neutron ◽  
Spin Fluctuations ◽  
Invar Effect ◽  
The Moment ◽  
Magnetization Behavior

From a comparison of the thermal expansion and magnetization behavior of uhv evaporated fcc FeNi films with the respective bulk we will show that neither the deviation of the moment from the Slater-Pauling curve nor the weak magnetic behavior (small spin wave stiffness) are relevant for the occurence of the Invar effect. Reason is that in the freshly evaporated films the premartensitic transition is prevented, which in the bulk (and 900K annealed films) leads to non propagating longitudinal spin fluctuations, not sensed in inelastic neutron scattering (“hidden excitation”) but contributing in a Bloch like form (T3/2 dependence) to the magnetization.

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