Temperature-dependent23NaKnight shifts and sharply peaked structure in the electronic densities of states of Na-Si clathrates

1998 ◽  
Vol 57 (7) ◽  
pp. 4172-4179 ◽  
Author(s):  
J. Gryko ◽  
P. F. McMillan ◽  
R. F. Marzke ◽  
A. P. Dodokin ◽  
A. A. Demkov ◽  
...  
Keyword(s):  
Densities Of States ◽  
Electronic Densities

Electronic densities of states of semi-infinite disordered chains: Comparisons of exact and analytic calculations

1986 ◽  
Vol 33 (2) ◽  
pp. 765-771 ◽  
Author(s):  
M. Hwang ◽  
R. Podloucky ◽  
A. Gonis ◽  
A. J. Freeman
Keyword(s):  
Densities Of States ◽  
Electronic Densities

scholarly journals Doping evolution of superconducting gaps and electronic densities of states in Ba(Fe 1−x Co x ) 2 As 2 iron pnictides

2010 ◽  
Vol 91 (4) ◽  
pp. 47008 ◽  
Author(s):  
F. Hardy ◽  
P. Burger ◽  
T. Wolf ◽  
R. A. Fisher ◽  
P. Schweiss ◽  
...  
Keyword(s):  
Iron Pnictides ◽  
Densities Of States ◽  
Electronic Densities

scholarly journals Endohedral gallide cluster superconductors and superconductivity in ReGa5

2015 ◽  
Vol 112 (51) ◽  
pp. E7048-E7054 ◽  
Author(s):  
Weiwei Xie ◽  
Huixia Luo ◽  
Brendan F. Phelan ◽  
Tomasz Klimczuk ◽  
Francois Alexandre Cevallos ◽  
...  
Keyword(s):  
Cluster Compounds ◽  
Structural Motif ◽  
Cluster Compound ◽  
Transition Temperatures ◽  
Superconducting Transition ◽  
Empirical Prediction ◽  
Vertex Sharing ◽  
Counting Rules ◽  
Densities Of States ◽  
Electronic Densities

We present transition metal-embedded (T@Gan) endohedral Ga-clusters as a favorable structural motif for superconductivity and develop empirical, molecule-based, electron counting rules that govern the hierarchical architectures that the clusters assume in binary phases. Among the binary T@Gan endohedral cluster systems, Mo8Ga41, Mo6Ga31, Rh2Ga9, and Ir2Ga9 are all previously known superconductors. The well-known exotic superconductor PuCoGa5 and related phases are also members of this endohedral gallide cluster family. We show that electron-deficient compounds like Mo8Ga41 prefer architectures with vertex-sharing gallium clusters, whereas electron-rich compounds, like PdGa5, prefer edge-sharing cluster architectures. The superconducting transition temperatures are highest for the electron-poor, corner-sharing architectures. Based on this analysis, the previously unknown endohedral cluster compound ReGa5 is postulated to exist at an intermediate electron count and a mix of corner sharing and edge sharing cluster architectures. The empirical prediction is shown to be correct and leads to the discovery of superconductivity in ReGa5. The Fermi levels for endohedral gallide cluster compounds are located in deep pseudogaps in the electronic densities of states, an important factor in determining their chemical stability, while at the same time limiting their superconducting transition temperatures.

The Physical Properties of Ge Clusters and Ultrathin Films

1990 ◽  
Vol 206 ◽  
Author(s):  
R. Q. Yu ◽  
J. Fortner ◽  
S. J. Chase ◽  
J. S. Lannin
Keyword(s):  
Physical Properties ◽  
Ultrathin Films ◽  
Photoelectron Spectroscopy ◽  
Short Range ◽  
Large Fraction ◽  
Ultraviolet Photoelectron Spectroscopy ◽  
Densities Of States ◽  
Before And After ◽  
Electronic Densities

ABSTRACTRaman scattering and ultraviolet photoelectron spectroscopy on Ge clusters and ultrathin films before and after H chemisorption reveal the significant changes in the vibrational and electronic densities of states with size. These effects are attributed to the large fraction of surface dangling bonds and the important role of short range order changes on physical properties.

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