scholarly journals Topotactic Intercalation of a Metallic Dense Host Matrix Chalcogenide with Large Electron—Phonon Coupling: Crystal Structures and Electronic Properties of LixMo2SbS2 (0 ≤ x ≤ 0.7).

ChemInform ◽  
2007 ◽  
Vol 38 (15) ◽  
Author(s):  
Alexandros Lappas ◽  
Christopher J. Nuttall ◽  
Zacharias G. Fthenakis ◽  
Vladimir Yu. Pomjakushin ◽  
Mark A. Roberts
Keyword(s):  
Electronic Properties ◽  
Crystal Structures ◽  
Phonon Coupling ◽  
Host Matrix ◽  
Electron Phonon Coupling

Topotactic Intercalation of a Metallic Dense Host Matrix Chalcogenide with Large Electron−Phonon Coupling:  Crystal Structures and Electronic Properties of LixMo2SbS2(0 ≤x< 0.7)

2007 ◽  
Vol 19 (1) ◽  
pp. 69-78 ◽  
Author(s):  
Alexandros Lappas ◽  
Christopher J. Nuttall ◽  
Zacharias G. Fthenakis ◽  
Vladimir Yu. Pomjakushin ◽  
Mark A. Roberts
Keyword(s):  
Electronic Properties ◽  
Crystal Structures ◽  
Phonon Coupling ◽  
Host Matrix ◽  
Electron Phonon Coupling

scholarly journals Band-selective Holstein polaron in Luttinger liquid material A0.3MoO3 (A = K, Rb)

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
L. Kang ◽  
X. Du ◽  
J. S. Zhou ◽  
X. Gu ◽  
Y. J. Chen ◽  
...  
Keyword(s):  
Charge Density ◽  
Electronic Properties ◽  
Charge Density Wave ◽  
Density Wave ◽  
Luttinger Liquid ◽  
Phonon Coupling ◽  
Strong Electron ◽  
One Dimensional ◽  
Molybdenum Blue ◽  
Electron Phonon Coupling

Abstract(Quasi-)one-dimensional systems exhibit various fascinating properties such as Luttinger liquid behavior, Peierls transition, novel topological phases, and the accommodation of unique quasiparticles (e.g., spinon, holon, and soliton, etc.). Here we study molybdenum blue bronze A0.3MoO3 (A = K, Rb), a canonical quasi-one-dimensional charge-density-wave material, using laser-based angle-resolved photoemission spectroscopy. Our experiment suggests that the normal phase of A0.3MoO3 is a prototypical Luttinger liquid, from which the charge-density-wave emerges with decreasing temperature. Prominently, we observe strong renormalizations of band dispersions, which are recognized as the spectral function of Holstein polaron derived from band-selective electron-phonon coupling in the system. We argue that the strong electron-phonon coupling plays an important role in electronic properties and the charge-density-wave transition in blue bronzes. Our results not only reconcile the long-standing heavy debates on the electronic properties of blue bronzes but also provide a rare platform to study interesting excitations in Luttinger liquid materials.

scholarly journals A Combined Experimental and First-Principles Based Assessment of Finite-Temperature Thermodynamic Properties of Intermetallic Al3Sc

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1837
Author(s):  
Ankit Gupta ◽  
Bengü Tas ◽  
Dominique Korbmacher ◽  
Biswanath Dutta ◽  
Yulia Neitzel ◽  
...  
Keyword(s):  
Thermodynamic Properties ◽  
First Principles ◽  
Finite Temperature ◽  
Phonon Coupling ◽  
Host Matrix ◽  
Mechanical Coupling ◽  
Electron Phonon Coupling ◽  
The One ◽  
Coherency Loss ◽  
Fine Tune

We present a first-principles assessment of the finite-temperature thermodynamic properties of the intermetallic Al3Sc phase including the complete spectrum of excitations and compare the theoretical findings with our dilatometric and calorimetric measurements. While significant electronic contributions to the heat capacity and thermal expansion are observed near the melting temperature, anharmonic contributions, and electron–phonon coupling effects are found to be relatively small. On the one hand, these accurate methods are used to demonstrate shortcomings of empirical predictions of phase stabilities such as the Neumann–Kopp rule. On the other hand, their combination with elasticity theory was found to provide an upper limit for the size of Al3Sc nanoprecipitates needed to maintain coherency with the host matrix. The chemo-mechanical coupling being responsible for the coherency loss of strengthening precipitates is revealed by a combination of state-of-the-art simulations and dedicated experiments. These findings can be exploited to fine-tune the microstructure of Al-Sc-based alloys to approach optimum mechanical properties.

scholarly journals Structure and superconductivity of hydrides at high pressures

2016 ◽  
Vol 4 (1) ◽  
pp. 121-135 ◽  
Author(s):  
Defang Duan ◽  
Yunxian Liu ◽  
Yanbin Ma ◽  
Ziji Shao ◽  
Bingbing Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Crystal Structures ◽  
Room Temperature ◽  
High Pressures ◽  
High Temperature Superconductors ◽  
Phonon Coupling ◽  
Metallic Hydrogen ◽  
Hydrogen Atoms ◽  
Strong Electron ◽  
Electron Phonon Coupling

Abstract Hydrogen atoms can provide high phonon frequencies and strong electron–phonon coupling in hydrogen-rich materials, which are believed to be potential high-temperature superconductors at lower pressure than metallic hydrogen. Especially, recently both of theoretical and experimental reports on sulfur hydrides under pressure exhibiting superconductivity at temperatures as high as 200 K have further stimulated an intense search for room-temperature superconductors in hydrides. This review focuses on crystal structures, stabilities, pressure-induced transformations, metallization, and superconductivity of hydrogen-rich materials at high pressures.

Lattice dynamics and electron-phonon coupling in pentacene crystal structures

2004 ◽  
Vol 212 (1) ◽  
pp. 375-380 ◽  
Author(s):  
Matteo Masino ◽  
Alberto Girlando ◽  
Aldo Brillante ◽  
Luca Farina ◽  
Raffaele Guido Della Valle ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Lattice Dynamics ◽  
Phonon Coupling ◽  
Electron Phonon Coupling
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