scholarly journals Magnon spectrum of the helimagnetic insulator Cu2OSeO3

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
P. Y. Portnichenko ◽  
J. Romhányi ◽  
Y. A. Onykiienko ◽  
A. Henschel ◽  
M. Schmidt ◽  
...  
Keyword(s):  
Magnon Spectrum

scholarly journals Spin liquid mediated RKKY interaction

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Henry F. Legg ◽  
Bernd Braunecker
Keyword(s):  
Wave Theory ◽  
Spin Liquid ◽  
Spin Liquids ◽  
Rkky Interaction ◽  
Nuclear Spins ◽  
Zero Energy ◽  
Small Magnetic Field ◽  
Fermionic Systems ◽  
Type Interaction ◽  
Magnon Spectrum

AbstractWe propose an RKKY-type interaction that is mediated by a spin liquid. If a spin liquid exists such an interaction could leave a fingerprint by ordering underlying localised moments such as nuclear spins. This interaction has a unique phenomenology that is distinct from the RKKY interaction found in fermionic systems; most notably the lack of a Fermi surface and absence of the requirement for itinerant electrons, since most spin liquids are insulators. We demonstrate that the interaction is predominately shaped by the lattice symmetries of the underlying spin liquid. As a working example we investigate the possible ordering of nuclear spins that interact through an underlying lattice of the two-dimensional spin-1/2 kagome antiferromagnet (KHAF), although the treatment remains general and can be extended to other spin liquids and dimensions. We find that several different nuclear spin orderings minimise the RKKY-type energy induced by the KHAF but are unstable due to a zero-energy flat magnon band in linear spin-wave theory. Despite this we show that a small magnetic field is able to gap out this magnon spectrum resulting in an intricate nuclear magnetism.

Critical points and the two-magnon spectrum

1979 ◽  
Vol 19 (11) ◽  
pp. 5803-5809 ◽  
Author(s):  
A. A. Bahurmuz ◽  
P. D. Loly
Keyword(s):  
Critical Points ◽  
Magnon Spectrum

Magnetic excitations in a cycloidal magnet: the magnon spectrum of multiferroic TbMnO3

2008 ◽  
Vol 20 (43) ◽  
pp. 434212 ◽  
Author(s):  
D Senff ◽  
N Aliouane ◽  
D N Argyriou ◽  
A Hiess ◽  
L P Regnault ◽  
...  
Keyword(s):  
Magnetic Excitations ◽  
Magnon Spectrum

scholarly journals On the Magnon Spectrum of Antiferromagnetically Aligned Bilayer Films

1993 ◽  
Vol 83 (5) ◽  
pp. 677-683 ◽  
Author(s):  
H. Puszkarski ◽  
B. Kołodziejczak ◽  
A. Akjouj ◽  
B. Djafari-Rouhani ◽  
L. Dobrzynski
Keyword(s):  
Bilayer Films ◽  
Magnon Spectrum

scholarly journals Magnon spectrum of the Weyl semimetal half-Heusler compound GdPtBi

2020 ◽  
Vol 101 (1) ◽  
Author(s):  
A. S. Sukhanov ◽  
Y. A. Onykiienko ◽  
R. Bewley ◽  
C. Shekhar ◽  
C. Felser ◽  
...  
Keyword(s):  
Heusler Compound ◽  
Weyl Semimetal ◽  
Magnon Spectrum

The use of a spin-dependent intermolecular potential to predict the crystal structure and antiferromagnetism of solid α-oxygen

1974 ◽  
Vol 340 (1620) ◽  
pp. 81-90 ◽  
Keyword(s):  
Magnetic Ordering ◽  
Intermolecular Potential ◽  
Exchange Constant ◽  
Hexagonal Symmetry ◽  
Magnetic Exchange ◽  
Jones Potential ◽  
Lennard Jones ◽  
Α Phase ◽  
Magnon Spectrum ◽  
Reasonable Description

A spin-dependent intermolecular potential based on the overlap of molecular orbitals is proposed to describe the low-temperature α-phase of solid oxygen. The results are compared with those of a Lennard-Jones potential calculation which gives a reasonable description of β-oxygen. The distortion of the (001) plane from hexagonal symmetry is qualitatively explained and is due to the onset of magnetic ordering at the (β-α transition. The value of J, the magnetic exchange constant which enters phenomenological theories of magnetism, is found to be 4K in comparison with the value of 6K derived previously from the magnon spectrum.

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