Effect of a Zn Impurity and the Superconducting Pairing Symmetry in Iron-Based Superconductors

2018 ◽  
pp. 139-155
Author(s):  
Y. K. Li ◽  
X. Lin ◽  
Q. Tao ◽  
G. H. Cao ◽  
Z. A. Xu
Keyword(s):  
Pairing Symmetry ◽  
Iron Based Superconductors ◽  
Iron Based ◽  
Superconducting Pairing

scholarly journals Spin dynamics and orbital-antiphase pairing symmetry in iron-based superconductors

2014 ◽  
Vol 10 (11) ◽  
pp. 845-850 ◽  
Author(s):  
Z. P. Yin ◽  
K. Haule ◽  
G. Kotliar
Keyword(s):  
Spin Dynamics ◽  
Pairing Symmetry ◽  
Iron Based Superconductors ◽  
Iron Based

EFFECT OF ZINC IMPURITY AND ITS IMPLICATION TO THE PAIRING SYMMETRY IN IRON-BASED SUPERCONDUCTORS

2012 ◽  
Vol 26 (20) ◽  
pp. 1230012 ◽  
Author(s):  
ZHU-AN XU ◽  
GUANGHAN CAO ◽  
YUKE LI
Keyword(s):  
Parent Compound ◽  
Pairing Symmetry ◽  
Impurity Effect ◽  
Superconducting Transition ◽  
S Wave ◽  
Iron Based Superconductors ◽  
Co Doping ◽  
Wave States ◽  
Iron Based ◽  
Carrier Doping

The effect of nonmagnetic Zn impurity on superconductivity in iron-based superconductors is reviewed. Zn impurity can severely suppress the antiferromagnetic (AFM) order of Fe ions in the parent compound LaFeAsO . In the 1111 type F-doped LaFeAs ( O , F ) system, the superconducting transition temperature (Tc) increases in the underdoped regime, remains unchanged in the optimally-doped regime, and is severely suppressed in the overdoped regime in the presence of Zn impurity. The results suggest a switch of the symmetry of the superconducting order parameters from a s-wave to s±- or d-wave states as the charge carrier doping increases in this system. To our surprise, Zn impurity strongly suppresses Tc in the Co -doped LaFeAsO and BaFe 2 As 2 systems despite of the Co doping level. The absence of universal Zn impurity effect implies that the pairing symmetry of the iron-based superconductors may be dependent on the details of the electronic structure.

Effect of single interstitial impurity in iron-based superconductors with sign-changed s-wave pairing symmetry

2015 ◽  
Vol 519 ◽  
pp. 65-70 ◽  
Author(s):  
Xiang-Long Yu ◽  
Da-Yong Liu ◽  
Ya-Min Quan ◽  
Xiao-Jun Zheng ◽  
Liang-Jian Zou
Keyword(s):  
Pairing Symmetry ◽  
Interstitial Impurity ◽  
S Wave ◽  
Iron Based Superconductors ◽  
Wave Pairing ◽  
Iron Based

Iron-based magnetic superconductors AEuFe4As4 (A= Rb, Cs): Natural superconductor-ferromagnet hybrids

2021 ◽  
Author(s):  
Ya-Bin Liu ◽  
Yi Liu ◽  
Guanghan Cao
Keyword(s):  
Magnetic Ordering ◽  
Research Progress ◽  
Future Research ◽  
Iron Based Superconductors ◽  
Main Research ◽  
The Past ◽  
Ferromagnetic Exchange ◽  
Iron Based ◽  
Superconducting Pairing ◽  
The Eu

Abstract Superconductivity (SC) and ferromagnetism (FM) are normally antagonistic, and their coexistence in a single crystalline material appears to be very rare. Over a decade ago, the iron-based pnictides of doped EuFe2As2 were found to render such a coexistence primarily because of the Fe-3d multiorbitals which simultaneously satisfy the superconducting pairing of Fe-3d electrons and the ferromagnetic exchange interaction among Eu local spins. In 2016, the discovery of the iron-based superconductors AEuFe4As4 (A= Rb, Cs) provided an additional and complementary material basis for the study of the coexistence and interplay between SC and FM. The two sibling compounds, which can be viewed as the intergrowth or hybrid between AFe2As2 and EuFe2As2, show SC in the FeAs bilayers at T c = 35 – 37 K, followed by a magnetic ordering at T m ∼ 15 K in the sandwiched Eu2+-ion sheets. Below T m, the Eu2+ spins align ferromagnetically within each Eu plane, making the system as a natural atomic-thick superconductor-ferromagnet superlattice. This paper reviews the main research progress in the emerging topic during the past five years, and an outlook for the future research opportunities is also presented.

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