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Proceedings of the International School of Physics Enrico Fermi
Onset of antiferromagnetism in heavy-fermion metals
Evidence is found for an atomically local contribution to the magnetic correlations which develops at the critical gold concentration, corresponding to a magnetic ordering temperature of zero, which implies that a Fermi-liquid-destroying spin-localizing transition, unanticipated from the spin density wave description, coincides with the antiferromagnetic quantum critical point.
Spin waves and electronic interactions in La2CuO4.
The observed dispersion relation shows evidence for substantial interactions beyond the nearest-neighbor Heisenberg term which can be understood in terms of a cyclic or ring exchange due to the strong hybridization path around the Cu4O4 square plaquettes.
Quantum Phase Transition of a Magnet in a Spin Bath
- H. Rønnow, R. Parthasarathy, J. Jensen, G. Aeppli, T. Rosenbaum, D. McMorrow
- 15 April 2005
It is found that interactions with the nuclear spin bath controlled the length scale over which the excitations could be entangled, which places a limit on the ability to observe intrinsic electronic quantum criticality.
Potential for spin-based information processing in a thin-film molecular semiconductor
T2 is more than two orders of magnitude greater than the duration of the spin manipulation pulses, which suggests that copper phthalocyanine holds promise for quantum information processing, and the long T1 indicates possibilities for medium-term storage of classical bits in all-organic devices on plastic substrates.
Entangled quantum state of magnetic dipoles
This finding is significant because it shows that entanglement, rather than energy-level redistribution, can underlie the magnetic behaviour of a simple insulating quantum spin system.
Antiferromagnetic order induced by an applied magnetic field in a high-temperature superconductor
It is reported that for one high-Tc superconductor, the applied field that imposes the vortex lattice also induces ‘striped’ antiferromagnetic order, observed in the measurements.
Scale-free structural organization of oxygen interstitials in La2CuO4+y
It is reported that the ordering of oxygen interstitials in the La2O2+y spacer layers of La2CuO4+y high-Tc superconductors is characterized by a fractal distribution up to a maximum limiting size of 400 μm, and intriguingly, these fractal distributions of dopants seem to enhance superconductivity at high temperature.
Transverse Field Spin Models: From Statistical Physics to Quantum Information
The transverse field Ising and XY models (the simplest quantum spin models) provide the organising principle for the rich variety of interconnected subjects which are covered in this book. From a…
A ferromagnet in a continuously tunable random field
The discovery that a simply measured magnetic response is singular above the Curie temperature of a model, disordered magnet, and that the associated singularity grows to an anomalous divergence at TC is reported.