Picosecond–milliångström lattice dynamics measured by ultrafast X-ray diffraction

Nature ◽  
10.1038/18631 ◽  
1999 ◽  
Vol 398 (6725) ◽  
pp. 310-312 ◽  
Author(s):  
Christoph Rose-Petruck ◽  
Ralph Jimenez ◽  
Ting Guo ◽  
Andrea Cavalleri ◽  
Craig W. Siders ◽  
...  
Keyword(s):  
Lattice Dynamics ◽  
X Ray Diffraction ◽  
X Ray

MULTIFERROIC MATERIALS Bi1-xSmxFeO3: A STUDY OF RAMAN AND ABSORPTION SPECTROSCOPIES

2010 ◽  
Vol 19 (02) ◽  
pp. 247-254 ◽  
Author(s):  
NGUYEN VAN MINH ◽  
DAO VIET THANG
Keyword(s):  
Lattice Dynamics ◽  
Optical Band Gap ◽  
Solid State Reaction Method ◽  
Diffraction Measurement ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Lattice Constants ◽  
Raman Measurement

Multiferroic Bi 1-x Sm x FeO 3(x = 0.00, 0.05, 0.1, 0.15, 0.2) ceramics were prepared by conventional solid state reaction method. X-ray diffraction measurement was carried out to characterize the crystal structure and to detect the impurities existing in these ceramics. The substitution of rare earth Sm for Bi was found to decrease the impurity phase in BiFeO 3 ceramics. There is strong evidence that both lattice constants a and c of the unit cell become smaller as the Sm 3+ content is increased. The effect of introducing Sm 3+ is shown to decrease the optical band gap for doped sample Bi 1-x Sm x FeO 3. Additionally, the temperature-dependent Raman measurement performed for the lattice dynamics study of Bi 1-x Sm x FeO 3 samples reveals a strong band centered at around 1000–1300 cm-1 which is associated with the resonant enhancement of two-phonon Raman scattering in the multiferroic Bi 1-x Sm x FeO 3 samples. This two-phonon signal is shown to broaden with increasing x. The Raman spectra at low wavenumbers are suggested to be related with magnon in this system.

Optically induced lattice dynamics probed with ultrafast X-ray diffraction

2005 ◽  
Author(s):  
H.J. Lee ◽  
J.B. Workman ◽  
R.D. Averitt ◽  
A.J. Taylor ◽  
J.P. Roberts ◽  
...  
Keyword(s):  
Lattice Dynamics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Optically Induced

X-ray Diffraction Study of Laser-Material Interactions with an Ultrafast Table-Top X-ray Source

1997 ◽  
Vol 502 ◽  
Author(s):  
T. Guo ◽  
C. Rose-Petruck ◽  
R. X. Jimenez ◽  
J. A. Squier ◽  
B. C. Walker ◽  
...  
Keyword(s):  
Lattice Dynamics ◽  
Laser System ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
X Ray Diffraction ◽  
Diffraction Intensity ◽  
Laser Material ◽  
X Ray ◽  
Laser Illumination ◽  
Terawatt Laser

ABSTRACTX-ray diffraction, employing a table-top, laser-driven x-ray source, has been used to investigate laser-material interactions with simultaneous picosecond and subatomic range distance resolution. The x-ray source, consisting of a table-top terawatt laser system and a moving Cu wire target apparatus, generates ˜ 5 × 1010 photons (4π steradians s)−1 of Cu Kα radiation. The lattice dynamics of the (111) planes of GaAs single crystals has been studied after the crystal is exposed to intense femtosecond laser pulses. The diffraction results have yielded information about the timescale of the lattice dynamics in the picosecond range and an upper limit for the width of the xray pulses. Initial strain, defined as the percentage of lattice distortion resulted from the laser illumination, is as high as 0.25% and is followed by an exponential decay with a time constant of ˜ 150 ps. Increases in the diffraction intensity after the laser irradiation have also been observed, likely due to a transition from dynamic to kinematic diffraction associated with degradation of the crystal.

First-principles, UV Raman, X-ray diffraction and TEM study of the structure and lattice dynamics of the diamond–lonsdaleite system

2011 ◽  
Vol 20 (7) ◽  
pp. 951-953 ◽  
Author(s):  
V.N. Denisov ◽  
B.N. Mavrin ◽  
N.R. Serebryanaya ◽  
G.A. Dubitsky ◽  
V.V. Aksenenkov ◽  
...  
Keyword(s):  
First Principles ◽  
Lattice Dynamics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Raman

A combined model of electron density and lattice dynamics refined against elastic diffraction data. Thermodynamic properties of crystalline L-alanine

2020 ◽  
Vol 76 (1) ◽  
pp. 32-44 ◽  
Author(s):  
Ioana Sovago ◽  
Anna A. Hoser ◽  
Anders Ø. Madsen
Keyword(s):  
Dft Calculations ◽  
Electron Density ◽  
Normal Mode ◽  
Diffraction Data ◽  
Lattice Dynamics ◽  
Phonon Dispersion ◽  
Form Factors ◽  
X Ray Diffraction ◽  
Crystalline Materials ◽  
X Ray

Thermodynamic stability is an essential property of crystalline materials, and its accurate calculation requires a reliable description of the thermal motion – phonons – in the crystal. Such information can be obtained from periodic density functional theory (DFT) calculations, but these are costly and in some cases insufficiently accurate for molecular crystals. This deficiency is addressed here by refining a lattice-dynamics model, derived from DFT calculations, against accurate high-resolution X-ray diffraction data. For the first time, a normal-mode refinement is combined with the refinement of aspherical atomic form factors, allowing a comprehensive description and physically meaningful deconvolution of thermal motion and static charge density in the crystal. The small and well diffracting L-alanine system was used. Different lattice-dynamics models, with or without phonon dispersion, and derived from different levels of theory, were tested, and models using spherical and aspherical form factors were compared. The refinements indicate that the vibrational information content in the 23 K data is too small to study lattice dynamics, whereas the 123 K data appear to hold information on the acoustic and lowest-frequency optical phonons. These normal-mode models show slightly larger refinement residuals than their counterparts using atomic displacement parameters, and these features are not removed by considering phonon dispersion in the model. The models refined against the 123 K data, regardless of their sophistication, give calculated heat capacities for L-alanine within less than 1 cal mol−1 K−1 of the calorimetric measurements, in the temperature range 10–300 K. The findings show that the normal-mode refinement method can be combined with an elaborate description of the electron density. It appears to be a promising technique for free-energy determination for crystalline materials at the expense of performing a single-crystal elastic X-ray diffraction determination combined with periodic DFT calculations.

Analysis of ultrafast X-ray diffraction data in a linear-chain model of the lattice dynamics

2011 ◽  
Vol 106 (3) ◽  
pp. 489-499 ◽  
Author(s):  
M. Herzog ◽  
D. Schick ◽  
P. Gaal ◽  
R. Shayduk ◽  
C. Korff Schmising ◽  
...  
Keyword(s):  
Diffraction Data ◽  
Lattice Dynamics ◽  
Linear Chain ◽  
Chain Model ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Picosecond time-resolved x-ray diffraction probe of coherent lattice dynamics (abstract) (invited)

2002 ◽  
Vol 73 (3) ◽  
pp. 1361-1361
Author(s):  
D. A. Reis ◽  
M. F. DeCamp ◽  
P. H. Bucksbaum ◽  
R. Clarke ◽  
E. Dufresne ◽  
...  
Keyword(s):  
Lattice Dynamics ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray

Anharmonic Lattice Dynamics in Germanium Measured with Ultrafast X-Ray Diffraction

2000 ◽  
Vol 85 (3) ◽  
pp. 586-589 ◽  
Author(s):  
A. Cavalleri ◽  
C. W. Siders ◽  
F. L. H. Brown ◽  
D. M. Leitner ◽  
C. Tóth ◽  
...  
Keyword(s):  
Lattice Dynamics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Anharmonic Lattice
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