Displacement Parameter, Soft-Mode Frequency, and Fluctuations in Quartz Below Itsα−βPhase Transition

1971 ◽  
Vol 26 (26) ◽  
pp. 1627-1629 ◽  
Author(s):  
U. T. Höchli ◽  
J. F. Scott
Keyword(s):  
Soft Mode ◽  
Mode Frequency ◽  
Displacement Parameter

Magnetic-field dependence of the soft-mode frequency in KTa03AT 20K

1982 ◽  
Vol 44 (1) ◽  
pp. 121-128 ◽  
Author(s):  
W. N. Lawless ◽  
C. F. Clark ◽  
S. L. Swartz
Keyword(s):  
Magnetic Field ◽  
Field Dependence ◽  
Magnetic Field Dependence ◽  
Soft Mode ◽  
Mode Frequency

STABILISATION OF PARAELECTRIC PHASE BY STRONG CUBIC AND QUARTIC PHONON ANHARMONICITIES IN KDP CRYSTAL

1995 ◽  
Vol 09 (01) ◽  
pp. 45-55 ◽  
Author(s):  
T.C. UPADHYAY ◽  
N.S. PANWAR ◽  
B S. SEMWAL
Keyword(s):  
Soft Mode ◽  
Mode Frequency ◽  
Dielectric Susceptibility ◽  
Tangent Loss ◽  
Kdp Crystal ◽  
Coupled Mode ◽  
Para Phase ◽  
Real Value ◽  
Double Time ◽  
Anharmonic Interactions

Considering cubic and quartic phonon anharmonic interactions into the pseudospinphonon coupled mode model of Kobayashi6 expressions for shift, width, soft mode frequency and hence Curie temperature, dielectric susceptibility, Curie-Weiss constant and dielectric (tangent) loss have been evaluated for ferroelectric KDP. The method of retarded double-time thermal Green’s function and the treatment of Dyson’s equation have been used in the development. It is shown that cubic and quartic phonon anharmonic interactions render real value to the soft mode frequency in the para-phase. Results are in agreement with the experimental results of others.

Temperature Dependence of Soft Mode Frequency and Dielectric Constant in Ferroelectric PbHPO[sub 4] Crystal

2011 ◽  
Author(s):  
Trilok Chandra Upadhayay ◽  
Mayank Joshi ◽  
P. K. Bajpai ◽  
K. S. Ojha ◽  
K. N. Singh
Keyword(s):  
Dielectric Constant ◽  
Temperature Dependence ◽  
Soft Mode ◽  
Mode Frequency

Variation of the soft-mode frequency in ferroelectric semiconductors in a static electric field

1988 ◽  
Vol 31 (1) ◽  
pp. 29-33
Author(s):  
G. M. Benkin ◽  
V. V. Zil'berberg ◽  
N. V. Shchedrina
Keyword(s):  
Electric Field ◽  
Soft Mode ◽  
Mode Frequency ◽  
Static Electric Field

Magnetic-field dependence of the soft-mode frequency in KTaO3 AT 20K

1982 ◽  
Vol 44 (5) ◽  
pp. 121-128 ◽  
Author(s):  
W. N. Lawless ◽  
C. F. Clark ◽  
S. L. Swartz
Keyword(s):  
Magnetic Field ◽  
Field Dependence ◽  
Magnetic Field Dependence ◽  
Soft Mode ◽  
Mode Frequency
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