10 papers
Comment on "Tunnel Window's Imprint on Dipolar Field Distributions"
P. C. E. Stamp, I. S. Tupitsyn
In a recent letter Alonso et al. (Phys. Rev. Lett. 87, 097205 (2001)) present Monte Carlo simulations for interacting dipoles. Short-time relaxation was caused by a simple noise fi…
Spin bath-mediated decoherence in superconductors
Nikolay Prokof'ev, Philip Stamp
We consider a SQUID tunneling between 2 nearly degenerate flux states. Decoherence caused by paramagnetic and nuclear spins in the low- limit is shown to be much stronger than t…
Quantum Measurement Operations with Nanomagnets and SQUIDs
M. Dube, P. C. E. Stamp
The low-energy behaviour of 2 coupled nanomagnets or 2 coupled SQUIDs, interacting with their environment, can be described by the model of a ``Pair or Interacting Spins Coupled to…
Domain Wall Motion in the Presence of Nuclear Spins
M. Dube, P. C. E. Stamp
We investigate the motion of a domain wall in the presence of a dynamical hyperfine field. At temperature T high compared to the hyperfine coupling, the nuclear spins create a spat…
Quantum Relaxation of Ensembles of Nanomagnets
N. V. Prokof'ev, P. C. E. Stamp
Recent theory and experiment in crystals of molecular magnets suggest that fundamental tests of the decoherence mechanisms of macroscopic quantum phenomena may be feasible in these…
Short Time Quantum AC response of a system of Nanomagnets
G. Rose, P. C. E. Stamp
We calculate the magnetisation relaxation in the short-time regime for an ensemble of nanomagnets in the presence of a low-frequency external AC biasing field, at temperatures lowe…