scholarly journals Evidence for unidimensional low-energy excitations as the origin of persistent spin dynamics in geometrically frustrated magnets

2015 ◽  
Vol 91 (10) ◽  
Author(s):  
A. Yaouanc ◽  
P. Dalmas de Réotier ◽  
A. Bertin ◽  
C. Marin ◽  
E. Lhotel ◽  
...  
Keyword(s):  
Spin Dynamics ◽  
Low Energy ◽  
Frustrated Magnets ◽  
Geometrically Frustrated

scholarly journals Magnetisation Processes in Geometrically Frustrated Spin Networks with Self-Assembled Cliques

Entropy ◽  
2020 ◽  
Vol 22 (3) ◽  
pp. 336 ◽  
Author(s):  
Bosiljka Tadić ◽  
Miroslav Andjelković ◽  
Milovan Šuvakov ◽  
Geoff J. Rodgers
Keyword(s):  
Domain Walls ◽  
Spin Dynamics ◽  
Higher Order ◽  
Spin Networks ◽  
Graph Theoretic ◽  
Geometrically Frustrated ◽  
Geometric Frustration ◽  
Antiferromagnetic Materials ◽  
Geometrically Constrained ◽  
Ferromagnetic Interactions

Functional designs of nanostructured materials seek to exploit the potential of complex morphologies and disorder. In this context, the spin dynamics in disordered antiferromagnetic materials present a significant challenge due to induced geometric frustration. Here we analyse the processes of magnetisation reversal driven by an external field in generalised spin networks with higher-order connectivity and antiferromagnetic defects. Using the model in (Tadić et al. Arxiv:1912.02433), we grow nanonetworks with geometrically constrained self-assemblies of simplexes (cliques) of a given size n, and with probability p each simplex possesses a defect edge affecting its binding, leading to a tree-like pattern of defects. The Ising spins are attached to vertices and have ferromagnetic interactions, while antiferromagnetic couplings apply between pairs of spins along each defect edge. Thus, a defect edge induces n − 2 frustrated triangles per n-clique participating in a larger-scale complex. We determine several topological, entropic, and graph-theoretic measures to characterise the structures of these assemblies. Further, we show how the sizes of simplexes building the aggregates with a given pattern of defects affects the magnetisation curves, the length of the domain walls and the shape of the hysteresis loop. The hysteresis shows a sequence of plateaus of fractional magnetisation and multiscale fluctuations in the passage between them. For fully antiferromagnetic interactions, the loop splits into two parts only in mono-disperse assemblies of cliques consisting of an odd number of vertices n. At the same time, remnant magnetisation occurs when n is even, and in poly-disperse assemblies of cliques in the range n ∈ [ 2 , 10 ] . These results shed light on spin dynamics in complex nanomagnetic assemblies in which geometric frustration arises in the interplay of higher-order connectivity and antiferromagnetic interactions.

Muon-spin-relaxation investigation of the spin dynamics of geometrically frustrated chromium spinels

2002 ◽  
Vol 66 (17) ◽  
Author(s):  
M. T. Rovers ◽  
P. P. Kyriakou ◽  
H. A. Dabkowska ◽  
G. M. Luke ◽  
M. I. Larkin ◽  
...  
Keyword(s):  
Spin Relaxation ◽  
Spin Dynamics ◽  
Muon Spin ◽  
Muon Spin Relaxation ◽  
Geometrically Frustrated

Low temperature spin dynamics of geometrically frustrated antiferromagnets Y2Mo2O7 and Y2Mo1.6Ti0.4O7 studied by muon spin relaxation

1996 ◽  
Vol 79 (8) ◽  
pp. 6636 ◽  
Author(s):  
S. R. Dunsiger ◽  
R. F. Kiefl ◽  
K. H. Chow ◽  
B. D. Gaulin ◽  
M. J. P. Gingras ◽  
...  
Keyword(s):  
Low Temperature ◽  
Spin Relaxation ◽  
Spin Dynamics ◽  
Muon Spin ◽  
Muon Spin Relaxation ◽  
Geometrically Frustrated

Muon-spin relaxation measurements of geometrically frustrated magnets

2001 ◽  
Vol 79 (11-12) ◽  
pp. 1295-1305 ◽  
Author(s):  
K M Kojima
Keyword(s):  
Spin Relaxation ◽  
Muon Spin ◽  
Muon Spin Relaxation ◽  
Spin Systems ◽  
Frustrated Magnets ◽  
Slow Dynamics ◽  
Kagomé Lattice ◽  
Geometrically Frustrated ◽  
Relaxation Measurements ◽  
Frustrated Spin

Muon-spin relaxation (µSR) has been applied to investigations of slow dynamics and quasi-static features of geometrically frustrated spin systems. We take an example in the Kagome-lattice anti-ferromagnets, and briefly review µSR works on S = 1, 3/2, and 5/2 Kagome compounds. PACS No.: 75.30

Spin Dynamics in the Metallic State of YBa2(Cu0.98 Zn0.02) 3O6+x

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3330-3334 ◽  
Author(s):  
Y. Sidis ◽  
P. Bourges ◽  
B. Hennion ◽  
R. Villeneuve ◽  
G. Collin ◽  
...  
Keyword(s):  
Inelastic Neutron Scattering ◽  
Spin Dynamics ◽  
Inelastic Neutron ◽  
Resonance Peak ◽  
Low Energy ◽  
Metallic State ◽  
Magnetic Fluctuations ◽  
Local Enhancement ◽  
Compound I ◽  
Nonmagnetic Impurities

Inelastic neutron scattering measurements have been carried out on a YBa2(Cu0.98-Zn0.02)3O 6+x single crystal in both underdoped (x = 0.7) and overdoped (x = 0.97) regimes. In the zinc substituted system, spin dynamics is drastically changed in respect to the pure compound: (i) the "resonance peak" almost vanishes, (ii) the spin gap is filled, (iii) new antiferromagnetic excitations are found at low energy. These new magnetic fluctuations, which persist in the normal state, account for a local enhancement of AF correlations around nonmagnetic impurities. Besides, it is worth emphasizing that features, not directly related to superconductivity, i.e., the contribution to the spin dynamics apart from the resonance peak and the "spin pseudo-gap" observed in the underdoped regime above T c , coexist with the new low energy magnetic fluctuations.

scholarly journals Low-energy quasi-one-dimensional spin dynamics in charge-ordered La2−xSrxNiO4

2011 ◽  
Vol 83 (9) ◽  
Author(s):  
P. G. Freeman ◽  
D. Prabhakaran ◽  
K. Nakajima ◽  
A. Stunault ◽  
M. Enderle ◽  
...  
Keyword(s):  
Spin Dynamics ◽  
Low Energy ◽  
One Dimensional
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