scholarly journals Superconductivity without a hole pocket in electron-doped FeSe: Analysis beyond the Migdal-Eliashberg formalism

2017 ◽  
Vol 96 (4) ◽  
Author(s):  
Youichi Yamakawa ◽  
Hiroshi Kontani
Keyword(s):  
Hole Pocket ◽  
Eliashberg Formalism

Comparative Study of Electronic and Elastic Properties of Aluminum Gadolinium

2016 ◽  
Vol 28 ◽  
pp. 71-76
Author(s):  
Mani Shugani ◽  
Mahendra Aynyas ◽  
Sankar P. Sanyal
Keyword(s):  
Elastic Properties ◽  
Density Functional ◽  
Full Potential ◽  
Generalized Gradient ◽  
Aluminum Compound ◽  
Hole Pocket ◽  
Augmented Plane Wave ◽  
Bonding Properties ◽  
Linearized Augmented Plane Wave ◽  
Electron Pocket

We have performed First-principles density functional calculation by using full potential linearized augmented plane wave (FP-LAPW) method within generalized gradient approximation (GGA) of B2- AlGd (Aluminum compound). The ground state properties along with electronic and elastic properties are studied. The energy ranges are given for bands which are crossing the Fermi level and explained whether the Fermi surface is formed by hole pocket or electron pocket. Bonding properties are analyzed by charge density plot. By B/GH ratio the brittleness of the material is determined.

scholarly journals Fermi Surface Structure and Isotropic Stability of Fulde-Ferrell-Larkin-Ovchinnikov Phase in Layered Organic Superconductor β″-(BEDT-TTF)2SF5CH2CF2SO3

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1525
Author(s):  
Shiori Sugiura ◽  
Hiroki Akutsu ◽  
Yasuhiro Nakazawa ◽  
Taichi Terashima ◽  
Syuma Yasuzuka ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Surface Structure ◽  
Organic Superconductor ◽  
Josephson Vortex ◽  
Hole Pocket ◽  
Nodal Structure ◽  
Plane Field ◽  
Fflo Phase ◽  
Magnetoresistance Oscillations ◽  
Structure Calculations

The Fermi surface structure of a layered organic superconductor β″-(BEDT-TTF)2SF5CH2CF2SO3 was determined by angular-dependent magnetoresistance oscillations measurements and band-structure calculations. This salt was found to have two small pockets with the same area: a deformed square hole pocket and an elliptic electron pocket. Characteristic corrugations in the field dependence of the interlayer resistance in the superconducting phase were observed at any in-plane field directions. The features were ascribed to the commensurability (CM) effect between the Josephson vortex lattice and the periodic nodal structure of the superconducting gap in the Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) phase. The CM effect was observed in a similar field region for various in-plane field directions, in spite of the anisotropic nature of the Fermi surface. The results clearly showed that the FFLO phase stability is insensitive to the in-plane field directions.

Large-area single-crystal graphene grown on a recrystallized Cu(111) surface by using a hole-pocket method

Nanoscale ◽  
2016 ◽  
Vol 8 (28) ◽  
pp. 13781-13789 ◽  
Author(s):  
Hoang Danh Phan ◽  
Jaehyuck Jung ◽  
Youngchan Kim ◽  
Van Ngoc Huynh ◽  
Changgu Lee
Keyword(s):  
Single Crystal ◽  
Large Area ◽  
Hole Pocket

PENETRATION DEPTH CALCULATION IN THE FRAMEWORK OF THE TWO-BANDS ELIASHBERG MODEL IN MgB2

2002 ◽  
Vol 16 (05n06) ◽  
pp. 195-203
Author(s):  
CĂTĂLIN PAŞCU MOCA
Keyword(s):  
Experimental Data ◽  
Temperature Dependence ◽  
Penetration Depth ◽  
Practical Method ◽  
Eliashberg Formalism ◽  
Theoretical Results

We investigate the temperature dependence of the penetration depth λ(T) in MgB2 in the framework of the two-bands model using the Eliashberg formalism. We also study the influence of the impurities lifetime on the temperature dependence of λ(T). By direct comparison of the experimental data with theoretical results, a practical method to determine the orientation of the crystal is proposed.

Eliashberg Theory of the Superconducting State of Marginal Fermi Liquids

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3225-3230
Author(s):  
Han-Yong Choi ◽  
Jung-Woo Yoo
Keyword(s):  
Normal State ◽  
Collective Excitation ◽  
Energy Scale ◽  
Fermi Liquids ◽  
Eliashberg Theory ◽  
Self Energy ◽  
Marginal Fermi Liquid ◽  
Superconductive State ◽  
New Energy ◽  
Eliashberg Formalism

The marginal Fermi liquid (MFL) which describes the anomalous normal state of the cuprates is extended to a d-wave superconductive state. A phenomenological collective excitation, P0(ω,T), is taken such that it gives rise to, after renormalization, the MFL behavior in the normal state. With the P0, the renormalized excitation spectrum and pairing function in superconductive state are calculated self-consistently within the Eliashberg formalism. In the superconductive state, the self-energy deviates from the normal state MFL ω/T-scaling and develops a new energy scale of ω0≈2Δ, where Δ is the pairing amplitude.

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