Magnetism, superconductivity, and pairing symmetry in iron-based superconductors
TLDR
In this paper, the antiferromagnetism and superconductivity in novel Fe-based superconductors were analyzed in the itinerant model of small electron and hole pockets near 0,0 and, respectively, and the effective interactions in both channels logarithmically flow toward the same values at low energies.Abstract:
We analyze antiferromagnetism and superconductivity in novel Fe-based superconductors within the itinerant model of small electron and hole pockets near 0,0 and ,. We argue that the effective interactions in both channels logarithmically flow toward the same values at low energies; i.e., antiferromagnetism and superconductivity must be treated on equal footing. The magnetic instability comes first for equal sizes of the two pockets, but loses to superconductivity upon doping. The superconducting gap has no nodes, but changes sign between the two Fermi surfaces extended s-wave symmetry. We argue that the T dependencies of the spin susceptibility and NMR relaxation rate for such a state are exponential only at very low T, and can be well fitted by power laws over a wide T range below Tc.read more
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Finite temperature spin-dynamics and phase transitions in spin-orbital models
TL;DR: In this paper, the authors study finite temperature properties of a generic spin-orbital model relevant to transition metal compounds, having coupled quantum Heisenberg-spin and Ising-orbitals degrees of freedom.
Journal ArticleDOI
Analysis of the London penetration depth in Ni-doped CaKFe 4 As 4
D. Torsello,D. Torsello,D. Torsello,Kyuil Cho,Kamal Joshi,Kamal Joshi,Sunil Ghimire,Sunil Ghimire,Giovanni Ummarino,Giovanni Ummarino,N. M. Nusran,N. M. Nusran,Makariy A. Tanatar,Makariy A. Tanatar,William R. Meier,William R. Meier,Mingyu Xu,Mingyu Xu,Sergey L. Bud'ko,Sergey L. Bud'ko,Paul C. Canfield,Paul C. Canfield,Gianluca Ghigo,Gianluca Ghigo,Ruslan Prozorov,Ruslan Prozorov +25 more
TL;DR: In this article, a combined experimental and theoretical analysis of superconductivity in CaK 1144 is presented, and the experimental results are analyzed within the Eliashberg theory, showing that the superconductivities of CaK1144 are well described by the nodeless parameters.
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Effects on superconductivity of transition-metal doping in FeSe0.5Te0.5
TL;DR: The effects of magnetic ion substitution on superconductivity suggest that the pairing symmetry may not be either pure s wave or pure d wave.
Journal ArticleDOI
Multiband Superconductivity in KFe2As2: Evidence for One Isotropic and Several Lilliputian Energy Gaps
Frédéric Hardy,Robert Eder,Martin Jackson,Dai Aoki,Carley Paulsen,Thomas Wolf,P. Burger,Anna E. Böhmer,Peter Schweiss,Peter Adelmann,R. A. Fisher,Christoph Meingast +11 more
TL;DR: In this article, a detailed low-temperature thermodynamic investigation (heat capacity and magnetization) of the superconducting state of KFe 2 As 2 for H || c axis is reported.
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Nonequilibrium quasiparticle relaxation dynamics in single crystals of hole- and electron-doped BaFe2As2
TL;DR: In this paper, the nonequilibrium quasiparticle dynamics in BaFe_2As_2 on both the hole-doped (Ba_(1−x)K_x Fe2As-2) and electron-doping (BaFe2−yCoyAs2) sides of the phase diagram using ultrafast pump-probe spectroscopy were investigated.
References
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