scholarly journals High-temperature superconductivity stabilized by electron-hole interband coupling in collapsed tetragonal phase ofKFe2As2under high pressure

2015 ◽  
Vol 91 (6) ◽  
Author(s):  
Yasuyuki Nakajima ◽  
Renxiong Wang ◽  
Tristin Metz ◽  
Xiangfeng Wang ◽  
Limin Wang ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Tetragonal Phase ◽  
High Temperature Superconductivity ◽  
Electron Hole ◽  
Interband Coupling

scholarly journals High temperature superconductivity in sulfur hydride under ultrahigh pressure: A complex superconducting phase beyond conventional BCS

2016 ◽  
Vol 2 (1) ◽  
Author(s):  
Annette Bussmann-Holder ◽  
Jürgen Köhler ◽  
M.-H. Whangbo ◽  
Antonio Bianconi ◽  
Arndt Simon
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Transition Temperature ◽  
Hydrogen Bonds ◽  
Pressure Dependence ◽  
High Temperature Superconductivity ◽  
Superconducting Phase ◽  
Ultrahigh Pressure ◽  
Phonon Modes ◽  
Interband Coupling

AbstractThe recent report of superconductivity under high pressure at the record transition temperature of Tc =203 K in pressurized H2S has been identified as conventional in view of the observation of an isotope effect upon deuteration. Here it is demonstrated that conventional theories of superconductivity in the sense of BCS or Eliashberg formalisms cannot account for the pressure dependence of the isotope coefficient. The only way out of the dilemma is a multi-band approach of superconductivity where already small interband coupling suffices to achieve the high values of Tc together with the anomalous pressure dependent isotope coefficient. In addition, it is shown that anharmonicity of the hydrogen bonds vanishes under pressure whereas anharmonic phonon modes related to sulfur are still active.

Prediction of superconducting ternary hydride MgGeH6: from divergent high-pressure formation routes

2017 ◽  
Vol 19 (40) ◽  
pp. 27406-27412 ◽  
Author(s):  
Yanbin Ma ◽  
Defang Duan ◽  
Ziji Shao ◽  
Da Li ◽  
Liyuan Wang ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Ab Initio ◽  
Phase Diagrams ◽  
High Temperature Superconductivity ◽  
High Pressure Phase ◽  
Pressure Phase

Invigorated by the high temperature superconductivity in some binary hydrogen-dominated compounds, we systematically explored high-pressure phase diagrams and superconductivity of a ternary Mg–Ge–H system usingab initiomethods.

High-temperature superconductivity in transition metallic hydrides MH11 (M = Mo, W, Nb, and Ta) under high pressure

2021 ◽  
Vol 23 (11) ◽  
pp. 6717-6724
Author(s):  
Mingyang Du ◽  
Zihan Zhang ◽  
Hao Song ◽  
Hongyu Yu ◽  
Tian Cui ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Transition Temperature ◽  
Critical Temperature ◽  
Superconducting Transition Temperature ◽  
High Temperature Superconductivity ◽  
Superconducting Transition ◽  
Optical Phonons ◽  
Acoustic Phonons ◽  
Acoustic Modes

The contribution of optical and acoustic modes to the superconducting transition temperature. The calculated EPC parameter λ, critical temperature (Tc), critical temperature caused by the interaction of electrons with optical phonons (T0c) and acoustic phonons (Tacc).

scholarly journals Pressure induced superconductivity in MnSe

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
T. L. Hung ◽  
C. H. Huang ◽  
L. Z. Deng ◽  
M. N. Ou ◽  
Y. Y. Chen ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Structural Change ◽  
High Temperature Superconductivity ◽  
The Rich ◽  
Related Compounds ◽  
Insight Into

AbstractThe rich phenomena in the FeSe and related compounds have attracted great interests as it provides fertile material to gain further insight into the mechanism of high temperature superconductivity. A natural follow-up work was to look into the possibility of superconductivity in MnSe. We demonstrated in this work that high pressure can effectively suppress the complex magnetic characters of MnSe, and induce superconductivity with Tc ~ 5 K at pressure ~12 GPa confirmed by both magnetic and resistive measurements. The highest Tc is ~ 9 K (magnetic result) at ~35 GPa. Our observations suggest the observed superconductivity may closely relate to the pressure-induced structural change. However, the interface between the metallic and insulating boundaries may also play an important role to the pressure induced superconductivity in MnSe.

Comment on “High-temperature superconductivity in transition metallic hydrides MH11 (M = Mo, W, Nb, and Ta) under high pressure” by M. Du, Z. Zhang, H. Song, H. Yu, T. Cui, V. Z. Kresinc and D. Duan, Phys. Chem. Chem. Phys., 2021, 23, 6717

2022 ◽  
Author(s):  
X. H. Zheng ◽  
J. X. Zheng
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
High Temperature Superconductivity ◽  
Chem Phys ◽  
Entire Surface ◽  
Fermi Sphere ◽  
Phys Chem Chem Phys

In superconductors, scattered electrons cover the entire surface of the Fermi sphere (circle in the figure, valency = 3). In the MP scheme in the article concerned, the shaded wedge confines coverage, causing errors in results.

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