C59oNMR shift anomalies and spin dynamics in the normal state of superconductingCeCoIn5: Verification of two-dimensional antiferromagnetic spin fluctuations

2010 ◽  
Vol 82 (2) ◽  
Author(s):  
Hironori Sakai ◽  
Seung-Ho Baek ◽  
Stuart E. Brown ◽  
Filip Ronning ◽  
Eric D. Bauer ◽  
...  
Keyword(s):  
Normal State ◽  
Spin Dynamics ◽  
Spin Fluctuations ◽  
Two Dimensional ◽  
Antiferromagnetic Spin

scholarly journals Evolution of spin excitations from bulk to monolayer FeSe

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jonathan Pelliciari ◽  
Seher Karakuzu ◽  
Qi Song ◽  
Riccardo Arpaia ◽  
Abhishek Nag ◽  
...  
Keyword(s):  
Quantum Monte Carlo ◽  
Spin Dynamics ◽  
Spin Fluctuations ◽  
Superconducting Transition ◽  
Pairing Mechanism ◽  
Range Magnetic Order ◽  
X Ray Scattering ◽  
Spin Excitations ◽  
Order Of Magnitude ◽  
Long Range Magnetic Order

AbstractIn ultrathin films of FeSe grown on SrTiO3 (FeSe/STO), the superconducting transition temperature Tc is increased by almost an order of magnitude, raising questions on the pairing mechanism. As in other superconductors, antiferromagnetic spin fluctuations have been proposed to mediate SC making it essential to study the evolution of the spin dynamics of FeSe from the bulk to the ultrathin limit. Here, we investigate the spin excitations in bulk and monolayer FeSe/STO using resonant inelastic x-ray scattering (RIXS) and quantum Monte Carlo (QMC) calculations. Despite the absence of long-range magnetic order, bulk FeSe displays dispersive magnetic excitations reminiscent of other Fe-pnictides. Conversely, the spin excitations in FeSe/STO are gapped, dispersionless, and significantly hardened relative to its bulk counterpart. By comparing our RIXS results with simulations of a bilayer Hubbard model, we connect the evolution of the spin excitations to the Fermiology of the two systems revealing a remarkable reconfiguration of spin excitations in FeSe/STO, essential to understand the role of spin fluctuations in the pairing mechanism.

scholarly journals Disordered loops in the two-dimensional antiferromagnetic spin–fermion model

2008 ◽  
Vol 795 (3) ◽  
pp. 578-595
Author(s):  
T. Enss ◽  
S. Caprara ◽  
C. Castellani ◽  
C. Di Castro ◽  
M. Grilli
Keyword(s):  
Two Dimensional ◽  
Fermion Model ◽  
Antiferromagnetic Spin

Spin fluctuations in random magnetic-nonmagnetic two-dimensional antiferromagnets. II. Heisenberg percolation

1980 ◽  
Vol 21 (1) ◽  
pp. 317-332 ◽  
Author(s):  
R. J. Birgeneau ◽  
R. A. Cowley ◽  
G. Shirane ◽  
J. A. Tarvin ◽  
H. J. Guggenheim
Keyword(s):  
Spin Fluctuations ◽  
Two Dimensional
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