scholarly journals Role of disorder on the quantum critical point of a model for heavy fermions

2001 ◽  
Vol 64 (14) ◽  
Author(s):  
T. G. Rappoport ◽  
A. Saguia ◽  
B. Boechat ◽  
M. A. Continentino
Keyword(s):  
Critical Point ◽  
Heavy Fermions ◽  
Quantum Critical Point ◽  
Quantum Critical

Drastic change of the electronic states at the quantum critical point in heavy fermions

2007 ◽  
Vol 310 (2) ◽  
pp. 541-547 ◽  
Author(s):  
R. Settai ◽  
H. Shishido ◽  
T. Kubo ◽  
S. Araki ◽  
T.C. Kobayashi ◽  
...  
Keyword(s):  
Critical Point ◽  
Heavy Fermions ◽  
Quantum Critical Point ◽  
Electronic States ◽  
Drastic Change ◽  
Quantum Critical

scholarly journals Nematic quantum critical point without magnetism in FeSe1−xSx superconductors

2016 ◽  
Vol 113 (29) ◽  
pp. 8139-8143 ◽  
Author(s):  
Suguru Hosoi ◽  
Kohei Matsuura ◽  
Kousuke Ishida ◽  
Hao Wang ◽  
Yuta Mizukami ◽  
...  
Keyword(s):  
Critical Point ◽  
High Temperature Superconductors ◽  
Quantum Critical Point ◽  
Antiferromagnetic Order ◽  
Iron Pnictide ◽  
Nematic Order ◽  
Unconventional Superconductors ◽  
Quantum Critical ◽  
The Impact

In most unconventional superconductors, the importance of antiferromagnetic fluctuations is widely acknowledged. In addition, cuprate and iron-pnictide high-temperature superconductors often exhibit unidirectional (nematic) electronic correlations, including stripe and orbital orders, whose fluctuations may also play a key role for electron pairing. In these materials, however, such nematic correlations are intertwined with antiferromagnetic or charge orders, preventing the identification of the essential role of nematic fluctuations. This calls for new materials having only nematicity without competing or coexisting orders. Here we report systematic elastoresistance measurements in FeSe1−xSx superconductors, which, unlike other iron-based families, exhibit an electronic nematic order without accompanying antiferromagnetic order. We find that the nematic transition temperature decreases with sulfur content x; whereas, the nematic fluctuations are strongly enhanced. Near x≈0.17, the nematic susceptibility diverges toward absolute zero, revealing a nematic quantum critical point. The obtained phase diagram for the nematic and superconducting states highlights FeSe1−xSx as a unique nonmagnetic system suitable for studying the impact of nematicity on superconductivity.

scholarly journals Superconductivity near a Quantum-Critical Point: The Special Role of the First Matsubara Frequency

2016 ◽  
Vol 117 (15) ◽  
Author(s):  
Yuxuan Wang ◽  
Artem Abanov ◽  
Boris L. Altshuler ◽  
Emil A. Yuzbashyan ◽  
Andrey V. Chubukov
Keyword(s):  
Critical Point ◽  
Quantum Critical Point ◽  
Special Role ◽  
Matsubara Frequency ◽  
Quantum Critical

scholarly journals Superconductivity at an antiferromagnetic quantum critical point: Role of energy fluctuations

2018 ◽  
Vol 98 (21) ◽  
Author(s):  
Jian Kang ◽  
Rafael M. Fernandes ◽  
Elihu Abrahams ◽  
Peter Wölfle
Keyword(s):  
Critical Point ◽  
Quantum Critical Point ◽  
Quantum Critical
Sign in / Sign up

Export Citation Format

Share Document