Photoluminescence signatures of thermal expansion, electron–phonon coupling and phase transitions in cesium lead bromide perovskite nanosheets

Nanoscale ◽  
2020 ◽  
Vol 12 (13) ◽  
pp. 7315-7320 ◽  
Author(s):  
Xiangzhou Lao ◽  
Wei Zhou ◽  
Yitian Bao ◽  
Xiaorui Wang ◽  
Zhi Yang ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Phase Transitions ◽  
Variable Temperature ◽  
Broad Temperature Range ◽  
Phonon Coupling ◽  
Pl Spectra ◽  
Temperature Range ◽  
Electron Phonon Coupling ◽  
Lead Bromide

Variable-temperature PL spectra of CsPbBr3 nanosheets are investigated in a broad temperature range of 5–500 K.

scholarly journals Volume-Based Considerations for the Metal-Insulator Transition of CMR Oxides

1997 ◽  
Vol 494 ◽  
Author(s):  
J. J. Neumeier ◽  
A. L. Cornelius ◽  
M. F. Hundley ◽  
K. Andres ◽  
K. J. McClellan
Keyword(s):  
Electrical Resistivity ◽  
Thermal Expansion ◽  
Phase Transitions ◽  
Applied Pressure ◽  
Phonon Coupling ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Resistivity Data ◽  
Volume Dependence ◽  
Electron Phonon Coupling

ABSTRACTThe sensitivity of ρ to changes in volume which occur through: (1) applied pressure, (2) variations in temperature, and (3) phase transitions, is evaluated for some selected CMR oxides. It is argued that the changes in volume associated with (2) and (3), which are referred to as self pressures, are equivalent in magnitude to changes in volume resulting from pressures in the range of 0.18 to 0.45 GPa. Through consideration of thermal expansion and electrical resistivity data, it is shown that these self pressures are responsible for large features in the electrical resistivity and are an important component for the occurrence of the metallicity below Tc. It is suggested that this is a manifestation of a strong volume dependence of the electron phonon coupling in the CMR oxides.

Disentangling Electron–Phonon Coupling and Thermal Expansion Effects in the Band Gap Renormalization of Perovskite Nanocrystals

2020 ◽  
pp. 569-575
Author(s):  
Andrea Rubino ◽  
Adrián Francisco-López ◽  
Alex J. Barker ◽  
Annamaria Petrozza ◽  
Mauricio E. Calvo ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Band Gap ◽  
Phonon Coupling ◽  
Perovskite Nanocrystals ◽  
Electron Phonon Coupling

Variable-temperature infrared spectroscopic study of some molybdenum bronzes: evidence for electron–phonon coupling

1993 ◽  
Vol 89 (19) ◽  
pp. 3603-3609 ◽  
Author(s):  
Richard Mortimer ◽  
James G. Powell ◽  
Martha Greenblatt ◽  
William H. McCarroll ◽  
Kandalam V. Ramanujachary
Keyword(s):  
Spectroscopic Study ◽  
Variable Temperature ◽  
Infrared Spectroscopic Study ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Infrared Spectroscopic

Low temperature photoluminescence properties of CsPbBr3 quantum dots embedded in glasses

2017 ◽  
Vol 19 (26) ◽  
pp. 17349-17355 ◽  
Author(s):  
Bing Ai ◽  
Chao Liu ◽  
Zhao Deng ◽  
Jing Wang ◽  
Jianjun Han ◽  
...  
Keyword(s):  
Activation Energy ◽  
Quantum Dots ◽  
Thermal Expansion ◽  
Low Temperature ◽  
Size Dependence ◽  
Phonon Coupling ◽  
Photoluminescence Properties ◽  
Electron Phonon Coupling ◽  
Cspbbr3 Quantum Dots ◽  
Low Temperature Photoluminescence

Size dependence of exciton activation energy, electron–phonon coupling strength, and thermal expansion of the bandgap of CsPbBr3 QDs were studied.

Thermal Expansion and Phase Transitions in Na3H(SO4)2 Sulfate in the Low-Temperature Range

2019 ◽  
Vol 45 (5) ◽  
pp. 395-397
Author(s):  
N. V. Dmitrieva ◽  
R. S. Bubnova ◽  
S. K. Filatov ◽  
A. P. Shablinskii ◽  
M. G. Krzhizhanovskaya
Keyword(s):  
Thermal Expansion ◽  
Phase Transitions ◽  
Low Temperature ◽  
Temperature Range

Investigations of the Thermal Shifts and Electron–Phonon Coupling Parameters of R1 and R2 Lines for Cr3+-doped Forsterite

2014 ◽  
Vol 69 (8-9) ◽  
pp. 497-500 ◽  
Author(s):  
Xiao-Xuan Wu ◽  
Wen-Chen Zheng
Keyword(s):  
Thermal Expansion ◽  
Spectral Lines ◽  
Coupling Coefficients ◽  
Phonon Coupling ◽  
Lattice Thermal Expansion ◽  
Phonon Interaction ◽  
Electron Phonon Interaction ◽  
Electron Phonon Coupling ◽  
Coupling Parameters ◽  
Vibrational Contribution

The thermal shifts of R1 and R2 lines in Cr3+-doped forsterite (Mg2SiO4) are studied by considering both the static contribution due to lattice thermal expansion and the vibrational contribution due to electron-phonon interaction. In the studies, the thermal expansion coefficient of the Cr3+ center is assumed reasonably as that of the corresponding cluster in the host crystal. The results suggest that for R1 and R2 lines the static contributions are opposite in sign and in magnitude about 37% and 45%, respectively, of the corresponding vibrational contributions. The true electron-phonon coupling coefficients α' (obtained by considering both contributions) increase by about 58% and 81%, respectively, for R1 and R2 lines in comparison with the corresponding parameters α obtained by considering only the vibrational contribution. It appears that for the reasonable explanation of thermal shift of spectral lines and the exact estimation of electron-phonon coupling coefficient, both the static and vibrational contributions should be taken into account

Thermal analysis of the phases of HMX using X-ray diffraction

1993 ◽  
Vol 204 (1) ◽  
Author(s):  
M. Herrmann ◽  
W. Engel ◽  
N. Eisenreich
Keyword(s):  
Thermal Analysis ◽  
Thermal Expansion ◽  
Phase Transitions ◽  
Diffraction Pattern ◽  
X Ray Diffraction ◽  
Volume Changes ◽  
X Ray ◽  
Temperature Range

AbstractThe 4 phases of HMX and its transitions were investigated using X-ray diffraction. The phases were heated stepwise in a temperature range from 170 K to 510 K, measuring a diffraction pattern after each step.The thermal expansion of the different phases and the volume changes during the phase transitions were obtained. Anomalies and strongly anisotropic expansions were observed withThe highest thermal expansion was found with

Experimental determination of surface thermal expansion and electron–phonon coupling constant of 1T-PtTe2

2D Materials ◽  
2020 ◽  
Vol 7 (2) ◽  
pp. 025007 ◽  
Author(s):  
Gloria Anemone ◽  
Manuela Garnica ◽  
Marilena Zappia ◽  
Pablo Casado Aguilar ◽  
Amjad Al Taleb ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Experimental Determination ◽  
Coupling Constant ◽  
Phonon Coupling ◽  
Electron Phonon Coupling
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