ANOMALOUS SPIN DYNAMICS IN THE PARAMAGNETIC PHASE OF SPIN GLASSES

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1045-C8-1046
Author(s):  
F. Mezei ◽  
H. Maletta ◽  
B. Farago ◽  
S. M. Shapiro
Keyword(s):  
Spin Glasses ◽  
Spin Dynamics ◽  
Paramagnetic Phase

Nmr and Mössbauer Effect Studies on Diluted Heisenberg Ferromagnets and Spin-Glasses: EuxSr1−xS

1980 ◽  
Vol 3 ◽  
Author(s):  
H. Lütgemeier ◽  
Ch. Sauer ◽  
W. Zinn
Keyword(s):  
Hyperfine Field ◽  
Spin Glasses ◽  
Exchange Interactions ◽  
Paramagnetic Phase ◽  
Nearest Neighbour ◽  
Mossbauer Effect ◽  
Phase Boundaries ◽  
Magnetic Dilution ◽  
The Individual ◽  
The Eu

ABSTRACTThe systematic variations of experimentally determined exchange and hyperfine (h.f.) interactions between Eu2+ ions are compared firstly within the EuX (X=0,S,Se,Te) series of compounds and secondly in the magnetic dilution system EuxSr1−xS. Reasonably relations can be established between the individual nearest and next nearest neighbour exchange interactions (J1,J2 ) and the transferred h.f. interactions (ΔB1 , ΔB2 ), respectively, by considering their variations with the Eu–Eu distances (R1,R2). Using these results, the measured mean hyperfine field, BI(x), and the ferromagnetic saturation h.f. field, B↑↑ (x), of the EuxSr1−xS system can be related reasonably well to the ferro- and paramagnetic phase boundaries, Tc(x) and θ (x), respectively.

Spin dynamics of triangular lattice antiferromagnetCuFeO2: Crossover from spin-liquid to paramagnetic phase

2009 ◽  
Vol 80 (14) ◽  
Author(s):  
K. Hayashi ◽  
T. Nozaki ◽  
R. Fukatsu ◽  
Y. Miyazaki ◽  
T. Kajitani
Keyword(s):  
Triangular Lattice ◽  
Spin Dynamics ◽  
Paramagnetic Phase ◽  
Spin Liquid

scholarly journals Spin dynamics of aJ1-J2-Kmodel for the paramagnetic phase of iron pnictides

2012 ◽  
Vol 86 (8) ◽  
Author(s):  
Rong Yu ◽  
Zhentao Wang ◽  
Pallab Goswami ◽  
Andriy H. Nevidomskyy ◽  
Qimiao Si ◽  
...  
Keyword(s):  
Spin Dynamics ◽  
Paramagnetic Phase ◽  
Iron Pnictides

Spin dynamics of EuS in the paramagnetic phase

1989 ◽  
Vol 40 (7) ◽  
pp. 5036-5041 ◽  
Author(s):  
Ranjan Chaudhury ◽  
B. S. Shastry
Keyword(s):  
Spin Dynamics ◽  
Paramagnetic Phase

scholarly journals Double-exchange magnets: Spin dynamics in the paramagnetic phase

1999 ◽  
Vol 59 (22) ◽  
pp. R14149-R14152 ◽  
Author(s):  
Peter Horsch ◽  
Janez Jaklič ◽  
Frank Mack
Keyword(s):  
Spin Dynamics ◽  
Double Exchange ◽  
Paramagnetic Phase

scholarly journals Delocalization transition in low energy excitation modes of vector spin glasses

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Silvio Franz ◽  
Flavio Nicoletti ◽  
Giorgio Parisi ◽  
Federico Ricci-Tersenghi
Keyword(s):  
Spin Glass ◽  
Spin Glasses ◽  
Glass Phase ◽  
Paramagnetic Phase ◽  
Cavity Method ◽  
Zero Temperature ◽  
Energy Excitation ◽  
Spin Glass Phase ◽  
Glass Model ◽  
Fully Connected

We study the energy minima of the fully-connected mm-components vector spin glass model at zero temperature in an external magnetic field for m\ge 3m≥3. The model has a zero temperature transition from a paramagnetic phase at high field to a spin glass phase at low field. We study the eigenvalues and eigenvectors of the Hessian in the minima of the Hamiltonian. The spectrum is gapless both in the paramagnetic and in the spin glass phase, with a pseudo-gap behaving as \lambda^{m-1}λm−1 in the paramagnetic phase and as \sqrt{\lambda}λ at criticality and in the spin glass phase. Despite the long-range nature of the model, the eigenstates close to the edge of the spectrum display quasi-localization properties. We show that the paramagnetic to spin glass transition corresponds to delocalization of the edge eigenvectors. We solve the model by the cavity method in the thermodynamic limit. We also perform numerical minimization of the Hamiltonian for N\le 2048N≤2048 and compute the spectral properties, that show very strong corrections to the asymptotic scaling approaching the critical point.

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