Measuring random spin fluctuations for perturbation-free probes of spin dynamics and magnetic resonance (Invited Paper)

2005 ◽  
Author(s):  
Scott A. Crooker ◽  
Dwight G. Rickel ◽  
Alexander V. Balatsky ◽  
Darryl L. Smith
Keyword(s):  
Magnetic Resonance ◽  
Spin Dynamics ◽  
Spin Fluctuations

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.

Nuclear Magnetic Resonance Studies of δ-Stabilized Plutonium

2003 ◽  
Vol 802 ◽  
Author(s):  
N. J. Curro ◽  
L. Morales
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Low Frequency ◽  
Lattice Relaxation ◽  
Spin Fluctuations ◽  
Spin Lattice Relaxation ◽  
Cubic Symmetry ◽  
Magnetic Resonance Studies ◽  
Local Distortions ◽  
Nuclear Magnetic

Nuclear Magnetic Resonance studies of Ga stabilized δ-Pu reveal detailed information about the local distortions surrounding the Ga impurities as well as provides information about the local spin fluctuations experienced by the Ga nuclei. The Ga NMR spectrum is inhomogeneously broadened by a distribution of local electric field gradients (EFGs), which indicates that the Ga experiences local distortions from cubic symmetry. The Knight shift and spin lattice relaxation rate indicate that the Ga is dominantly coupled to the Fermi surface via core polarization, and is inconsistent with magnetic order or low frequency spin correlations.

scholarly journals Optimal Experiment Design for Magnetic Resonance Fingerprinting: Cramér-Rao Bound Meets Spin Dynamics

2019 ◽  
Vol 38 (3) ◽  
pp. 844-861 ◽  
Author(s):  
Bo Zhao ◽  
Justin P. Haldar ◽  
Congyu Liao ◽  
Dan Ma ◽  
Yun Jiang ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Spin Dynamics ◽  
Experiment Design ◽  
Optimal Experiment Design ◽  
Optimal Experiment ◽  
Cramer Rao Bound

Spin dynamics in theNd2−xCexCuO4system: Estimation of the rate of spin fluctuations

1996 ◽  
Vol 54 (22) ◽  
pp. 16254-16258 ◽  
Author(s):  
Vladimir Chechersky ◽  
Nikolai S. Kopelev ◽  
Amar Nath ◽  
J.-L. Peng ◽  
Richard L. Greene ◽  
...  
Keyword(s):  
Spin Dynamics ◽  
Spin Fluctuations

scholarly journals Efficient simulation of ultrafast magnetic resonance experiments

2017 ◽  
Vol 19 (27) ◽  
pp. 17577-17586 ◽  
Author(s):  
Ludmilla Guduff ◽  
Ahmed J. Allami ◽  
Carine van Heijenoort ◽  
Jean-Nicolas Dumez ◽  
Ilya Kuprov
Keyword(s):  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
Spin Dynamics ◽  
Spatial Dynamics ◽  
Planck Equation ◽  
Quantum Mechanical ◽  
Efficient Simulation ◽  
Fokker Planck Equation ◽  
Fokker Planck

We present a convenient and powerful simulation formalism for ultrafast NMR spectroscopy. The formalism is based on the Fokker–Planck equation that supports systems with complicated combinations of classical spatial dynamics and quantum mechanical spin dynamics.

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