scholarly journals Single reconstructed Fermi surface pocket in an underdoped single-layer cuprate superconductor

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
M. K. Chan ◽  
N. Harrison ◽  
R. D. McDonald ◽  
B. J. Ramshaw ◽  
K. A. Modic ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Single Layer ◽  
Cuprate Superconductor

scholarly journals Fermi-surface transformation across the pseudogap critical point of the cuprate superconductor La1.6−xNd0.4SrxCuO4

2017 ◽  
Vol 95 (22) ◽  
Author(s):  
C. Collignon ◽  
S. Badoux ◽  
S. A. A. Afshar ◽  
B. Michon ◽  
F. Laliberté ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Critical Point ◽  
Cuprate Superconductor ◽  
Surface Transformation

scholarly journals Probable Cause for the Superconductor-Like Properties of Alkane-Wetted Graphite and Single-Layer Graphene above Room Temperature under Ambient Pressure

2018 ◽  
Author(s):  
Myung-Hwan Whangbo
Keyword(s):  
Fermi Surface ◽  
Acoustic Phonon ◽  
Room Temperature ◽  
Ambient Pressure ◽  
Strong Support ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Strong Electron ◽  
Layer Graphene ◽  
Fermi Surface Nesting

Recently Kawashima has reported that, when wetted with alkanes, several forms of graphite and single-layer graphene exhibit superconductor-like properties above room temperature under ambient pressure [AIP Adv. 2013, 3, 052132; arXiv:1612.05294; arXiv:1801.09376]. Under the assumption that these seemingly unlikely properties arise from the presence of paired electrons brought about by the alkane-wetting, we explored their implications to arrive at a probable mechanism for strong electron-pairing driven by Fermi surface nesting and acoustic phonon. This mechanism explains why alkane-wetting is essential for the graphene systems to become “superconductor-like” above room temperature and why the “Tc” of alkane-wetted pitch-based graphite fibers increases almost linearly from ~363 to ~504 K with increasing the molecular weight of alkane from heptane to hexadecane. It also provides a number of experimentally-verifiable predictions, the confirmation of which will provide a strong support for the superconductivity driven by Fermi surface nesting and acoustic phonon.

scholarly journals Probable Cause for the Superconductor‐like Properties of Alkane-wetted Graphite and Single-layer Graphene Above Room Temperature Under Ambient Pressure

2018 ◽  
Author(s):  
mike whangbo
Keyword(s):  
Fermi Surface ◽  
Acoustic Phonon ◽  
Room Temperature ◽  
Ambient Pressure ◽  
Strong Support ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Layer Graphene ◽  
Fermi Surface Nesting ◽  
Graphite Fibers

<div>Recently Kawashima has reported that, when wetted with alkanes, several forms of graphite and single‐layer graphene exhibit superconductor‐like properties above room temperature under ambient pressure [AIP Adv. 2013, 3, 052132; arXiv:1612.05294; arXiv:1801.09376]. Under the assumption that these seemingly unlikely properties arise from the presence of paired electrons brought about by the</div><div>alkane‐wetting, we explored their implications to arrive at a probable mechanism for strong electronpairing</div><div>driven by Fermi surface nesting and acoustic phonon. This mechanism explains why alkane‐wetting is essential for the graphene systems to become “superconductor‐like” above room temperature and why the “Tc” of alkane‐wetted pitch‐based graphite fibers increases almost linearly from ~363 to ~504 K with increasing the molecular weight of alkane from heptane to hexadecane. It also provides a number of</div><div>experimentally‐verifiable predictions, the confirmation of which will provide a strong support for the superconductivity driven by Fermi surface nesting and acoustic phonon.</div>

scholarly journals Intertwined density waves in a metallic nickelate

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Junjie Zhang ◽  
D. Phelan ◽  
A. S. Botana ◽  
Yu-Sheng Chen ◽  
Hong Zheng ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Degrees Of Freedom ◽  
Density Wave ◽  
Single Layer ◽  
Late Transition Metal ◽  
Density Waves ◽  
Paramagnetic Metal ◽  
Late Transition

AbstractNickelates are a rich class of materials, ranging from insulating magnets to superconductors. But for stoichiometric materials, insulating behavior is the norm, as for most late transition metal oxides. Notable exceptions are the 3D perovskite LaNiO3, an unconventional paramagnetic metal, and the layered Ruddlesden-Popper phases R4Ni3O10, (R = La, Pr, Nd). The latter are particularly intriguing because they exhibit an unusual metal-to-metal transition. Here, we demonstrate that this transition results from an incommensurate density wave with both charge and magnetic character that lies closer in its behavior to the metallic density wave seen in chromium metal than the insulating stripes typically found in single-layer nickelates like La2-xSrxNiO4. We identify these intertwined density waves as being Fermi surface-driven, revealing a novel ordering mechanism in this nickelate that reflects a coupling among charge, spin, and lattice degrees of freedom that differs not only from the single-layer materials, but from the 3D perovskites as well.

scholarly journals Orbital mixture effect on the Fermi-surface–Tccorrelation in the cuprate superconductors: Bilayer vs. single layer

2014 ◽  
Vol 89 (22) ◽  
Author(s):  
Hirofumi Sakakibara ◽  
Katsuhiro Suzuki ◽  
Hidetomo Usui ◽  
Satoaki Miyao ◽  
Isao Maruyama ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Cuprate Superconductors ◽  
Single Layer ◽  
Mixture Effect

scholarly journals Fermi surface of the electron-doped cuprate superconductor Nd2−xCexCuO4probed by high-field magnetotransport

2011 ◽  
Vol 13 (1) ◽  
pp. 015001 ◽  
Author(s):  
M V Kartsovnik ◽  
T Helm ◽  
C Putzke ◽  
F Wolff-Fabris ◽  
I Sheikin ◽  
...  
Keyword(s):  
Fermi Surface ◽  
High Field ◽  
Cuprate Superconductor

scholarly journals Fermi Surface and Pseudogap Evolution in a Cuprate Superconductor

Science ◽  
2014 ◽  
Vol 344 (6184) ◽  
pp. 608-611 ◽  
Author(s):  
Y. He ◽  
Y. Yin ◽  
M. Zech ◽  
A. Soumyanarayanan ◽  
M. M. Yee ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Cuprate Superconductor

THE FERMI SURFACE IN A MAGNETIC METAL–INSULATOR INTERFACE

2002 ◽  
Vol 09 (02) ◽  
pp. 1243-1250 ◽  
Author(s):  
T. GREBER ◽  
W. AUWÄRTER ◽  
M. HOESCH ◽  
G. GRAD ◽  
P. BLAHA ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Magnetic Moment ◽  
Hexagonal Boron Nitride ◽  
Single Layer ◽  
Model Systems ◽  
Initial State ◽  
Itinerant Ferromagnet ◽  
Spin Polarized ◽  
Magnetic Metal ◽  
Structure Calculations

Nickel (111) and the interface of hexagonal boron nitride on Ni(111) serve as model systems for an itinerant ferromagnet that is truncated with vacuum or a single layer insulator. These systems are investigated with angle-scanned He I and He II photoemission. Upon formation of the h-BN/Ni(111) interface the work function drops by 1.8 eV and the minority Ni Λ3d-band shifts by 0.13 eV to higher binding energy. This indicates that the Ni magnetic moment decreases in the interface. Spin-polarized band structure calculations from bulk nickel identify the observed minority and majority bands. The experimental Fermi surface maps show that h-BN distorts a minority d-band in a way which is consistent with the decreasing magnetic moment. It can be seen that h-BN affects the scattering of the electrons. Effects in the photoemission final and initial state are recognized.

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