Publication

Correlations and fluctuations in the 2D Heisenberg antiferromagnet

2001
Journal Articles

Résumé

The correlations and fluctuations in Cu(DCOO)(2). 4D(2)O, which is a good physical realization of the 2D S = 1/2 Heisenberg antiferromagnet on a square lattice, have been measured by neutron scattering measurements. The quantum fluctuations cause a non-uniform. renormalization of the spin-wave dispersion with a zone boundary dispersion of 7%, while the spin wave amplitude is reduced to 51 +/- 4% of its classical value. The temperature dependence of the correlation length, the spin-wave damping and the spin-wave softening agrees with theoretical predictions over a large temperature range.

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https://infoscience.epfl.ch/entities/publication/d35fafa8-efb1-4b38-90c5-ea4506d1408d

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2001
Journal Articles

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/d35fafa8-efb1-4b38-90c5-ea4506d1408d

À propos de ce résultat

Concepts associés (32)

Onde de spin

In condensed matter physics, a spin wave is a propagating disturbance in the ordering of a magnetic material. These low-lying collective excitations occur in magnetic lattices with continuous symmetry. From the equivalent quasiparticle point of view, spin waves are known as magnons, which are bosonic modes of the spin lattice that correspond roughly to the phonon excitations of the nuclear lattice. As temperature is increased, the thermal excitation of spin waves reduces a ferromagnet's spontaneous magnetization.

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Quantum critical point

A quantum critical point is a point in the phase diagram of a material where a continuous phase transition takes place at absolute zero. A quantum critical point is typically achieved by a continuous suppression of a nonzero temperature phase transition to zero temperature by the application of a pressure, field, or through doping. Conventional phase transitions occur at nonzero temperature when the growth of random thermal fluctuations leads to a change in the physical state of a system.

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Publications associées (14)

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Correlations and fluctuations in the 2D Heisenberg antiferromagnet

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