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12 papers · 1 filter
Effect of superconducting fluctuations on ultrasound in unconventional superconductor
M. S. Mar'enko, C. Bourbonnais, A. -M. S. Tremblay
We study the renormalization of sound attenuation and sound velocity by fluctuation Cooper pairs in layered superconductors. We consider the influence of s- and d-wave symmetry of…
Finite Temperature Transitions in Large Magnetic Field in Dipolar Spin Ice
Jacob P. C. Ruff, Roger G. Melko, Michel J. P. Gingras
We use Monte Carlo simulations to identify the mechanism that allows for phase transitions in dipolar spin ice to occur and survive for applied magnetic field, H, much larger in st…
Folding Branes
Omid Saremi, Lev Kofman, Amanda W. Peet
We study classical dynamics of a probe Dp-brane moving in a background sourced by a stack of Dp-branes. In this context the physics is similar to that of the effective action for o…
Ordering and Spin Waves in NaNiO2 : A Stacked Quantum Ferromagnet
M. J. Lewis, B. D. Gaulin, L. Filion +5
Neutron scattering measurements on powder NaNiO2 reveal magnetic Bragg peaks and spin waves characteristic of strongly correlated s=1/2 magnetic moments arranged in ferromagnetic l…
Spin-Dynamics in the Carrier-Doped Triangular-Lattice of NaCoO-yHO
F. L. Ning, T. Imai, B. W. Statt +1
We probed the local electronic properties of the mixed-valent Co(+4-x) triangular-lattice in Na{x}CoO{2}-yH{2}O by 59-Co NMR. We observed two distinct types of Co sites for x>=1/2,…
On the Universality of the Hawking Effect
William G. Unruh, Ralf Schützhold
Addressing the question of whether the Hawking effect depends on degrees of freedom at ultra-high (e.g., Planckian) energies/momenta, we propose three rather general conditions on…