scholarly journals On the Superconductivity Suppression in Eu1−xPrxBa2Cu3O7−δ

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3503
Author(s):  
Paweł Pęczkowski ◽  
Piotr Zachariasz ◽  
Cezariusz Jastrzębski ◽  
Jarosław Piętosa ◽  
Elżbieta Drzymała ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Low Temperature ◽  
Magnetic Moment ◽  
Schematic Diagram ◽  
Optical Phonons ◽  
Phonon Coupling ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electron Phonon Coupling ◽  
X Ray Absorption

This article reports on the non-trivial suppression of superconductivity in the Eu1−xPrxBCO cuprates. As non-magnetic Eu3+ ions are replaced by Pr3+ carrying a magnetic moment, spin-related superconductivity loss can be expected. The research shows that the superconductivity disappearance for x > 0.4 results from depletion of the carriers and their localization. The above conclusion was drawn by low-temperature X-ray diffraction analysis showing increased characteristic phonon frequencies with Pr content. This mechanism should promote electron–phonon coupling, at least for acoustic phonons. However, the inverse phenomenon was detected. Namely, there is a gradual deterioration of the optical phonons responsible for vibration of the Cu–O bonds with Pr increasing, as evidenced by Raman spectroscopy. Furthermore, the results of X-ray absorption spectroscopy precisely showed the location of the carriers for Pr-rich specimens. Finally, a schematic diagram for Eu1−xPrxBCO is proposed to consolidate the presented research.

Structural properties of low-temperature grown ZnO thin films determined by X-ray diffraction and X-ray absorption spectroscopy

2011 ◽  
Vol 519 (13) ◽  
pp. 4366-4370 ◽  
Author(s):  
Chung-Jong Yu ◽  
Nark-Eon Sung ◽  
Han-Koo Lee ◽  
Hyun-Joon Shin ◽  
Young-Duck Yun ◽  
...  
Keyword(s):  
Thin Films ◽  
Low Temperature ◽  
Structural Properties ◽  
Absorption Spectroscopy ◽  
Zno Thin Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Temperature-dependent electron-phonon coupling in La2−xSrxCuO4probed by femtosecond x-ray diffraction

2013 ◽  
Vol 88 (5) ◽  
Author(s):  
B. Mansart ◽  
M. J. G. Cottet ◽  
G. F. Mancini ◽  
T. Jarlborg ◽  
S. B. Dugdale ◽  
...  
Keyword(s):  
Phonon Coupling ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
X Ray ◽  
Electron Phonon Coupling

The Structural Characterization of a Series of Uranium-containing Gadolinium Zirconates

2012 ◽  
Vol 1475 ◽  
Author(s):  
Daniel J. Gregg ◽  
Yingjie Zhang ◽  
Zhaoming Zhang ◽  
Inna Karatchevtseva ◽  
Mark G. Blackford ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Diffuse Reflectance ◽  
Charge Balance ◽  
X Ray Diffraction ◽  
Edge Structure ◽  
Gadolinium Zirconate ◽  
X Ray ◽  
Host Materials ◽  
X Ray Absorption

ABSTRACTA series of uranium-containing gadolinium zirconate samples have been fabricated at 1723 K in air. X-ray diffraction and Raman spectroscopy have confirmed pyrochlore or defect fluorite structures, while diffuse reflectance, X-ray absorption near edge structure and X-ray photoelectron spectroscopies indicate a predominantly U6+ oxidation state, even when Ca2+ was added to charge balance for U4+. The results demonstrate the potential of gadolinium zirconates as host materials for actinides.

Solvothermal Synthesized of TiO2 Microspheres and their Characterization

2012 ◽  
Vol 576 ◽  
pp. 345-348 ◽  
Author(s):  
Mohd Nor Asiah ◽  
M.F. Achoi ◽  
Saifollah Abdullah ◽  
M. Rusop
Keyword(s):  
Raman Spectroscopy ◽  
Low Temperature ◽  
Solvothermal Method ◽  
Anatase Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tio2 Microsphere ◽  
Spectroscopy Studies ◽  
Thermally Treated

In this paper, we have successfully synthesized TiO2 microsperes by solvothermal method using titanium (IV) isopropoxide as titanium source and ethanol as a solvent. The solution was thermally treated at relatively low temperature of 150 °C for 3 hours. The as-prepared and annealed of TiO2 microsphere were characterized using FESEM, XRD and Raman spectroscopy. The diameter of the microspheres was 1-6 µm. The X-ray diffraction and Raman spectroscopy studies show that the microspheres has anatase phase.

Structural distortion and electronic states of Rb doped WO3 by X-ray absorption spectroscopy

RSC Advances ◽  
2016 ◽  
Vol 6 (109) ◽  
pp. 107871-107877 ◽  
Author(s):  
Y. C. Wang ◽  
C. H. Hsu ◽  
Y. Y. Hsu ◽  
C. C. Chang ◽  
C. L. Dong ◽  
...  
Keyword(s):  
Structural Phase ◽  
Electronic States ◽  
Phonon Coupling ◽  
Structural Phase Transitions ◽  
Superconducting Properties ◽  
Strong Electron ◽  
X Ray ◽  
Electron Phonon Coupling ◽  
Complex Structural ◽  
X Ray Absorption

Rubidium tungsten bronzes (RbxWO3) have recently attracted much attention due to their intriguing phenomena, such as complex structural phase transitions, strong electron–phonon coupling, and superconducting properties.

scholarly journals Femtosecond electron-phonon lock-in by photoemission and x-ray free-electron laser

Science ◽  
2017 ◽  
Vol 357 (6346) ◽  
pp. 71-75 ◽  
Author(s):  
S. Gerber ◽  
S.-L. Yang ◽  
D. Zhu ◽  
H. Soifer ◽  
J. A. Sobota ◽  
...  
Keyword(s):  
Coupling Strength ◽  
Electronic Band Structure ◽  
Phonon Coupling ◽  
X Ray Diffraction ◽  
Electronic Band ◽  
Structure Comparison ◽  
X Ray ◽  
Iron Selenide ◽  
Electron Phonon Coupling ◽  
Lock In

The interactions that lead to the emergence of superconductivity in iron-based materials remain a subject of debate. It has been suggested that electron-electron correlations enhance electron-phonon coupling in iron selenide (FeSe) and related pnictides, but direct experimental verification has been lacking. Here we show that the electron-phonon coupling strength in FeSe can be quantified by combining two time-domain experiments into a “coherent lock-in” measurement in the terahertz regime. X-ray diffraction tracks the light-induced femtosecond coherent lattice motion at a single phonon frequency, and photoemission monitors the subsequent coherent changes in the electronic band structure. Comparison with theory reveals a strong enhancement of the coupling strength in FeSe owing to correlation effects. Given that the electron-phonon coupling affects superconductivity exponentially, this enhancement highlights the importance of the cooperative interplay between electron-electron and electron-phonon interactions.

Raman spectroscopy and X-ray diffraction of lithium niobate at temperatures up to 1300○-4.80pt○C

2005 ◽  
Vol 126 ◽  
pp. 101-105 ◽  
Author(s):  
B. Moulin ◽  
L. Hennet ◽  
D. Thiaudière ◽  
P. Melin ◽  
P. Simon
Keyword(s):  
Raman Spectroscopy ◽  
Lithium Niobate ◽  
X Ray Diffraction ◽  
X Ray
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