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Healthy Research Rewards
ResearchHub is incentivizing healthy research behavior. At this time, first authors of open access papers are eligible for rewards. Visit the publications tab to view your eligible publications.
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Vladimir Gornakov
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Transverse voltage in high-Tc superconductors in zero magnetic fields
Katrine Søborg Spang
et al.
Jul 20, 2001
Longitudinal and transverse voltages have been measured in zero externalmagnetic fields. In close vicinity of the superconducting transition nonzerotransverse voltage has been observed while far away from Tc, both above andbelow no such voltage has been detected. The value of the transverseresistivity depends on the value of the transport current. Several models havebeen discussed taking into account also the penetration of self field due tothe applied transport current. It seems that observed results can be explainedusing the Kosterlitz-Thouless model as a result of an unpairing ofvortex-antivortex pairs created below Tkt due to fluctuations. At Tkt freevortices and antivortices are created and can contribute to a dissipation ofenergy. Their movement should also be responsible for the observed nonzerotransverse voltage.
Physics
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Physics
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The Collective Coordinates Jacobian
Fabio MARINELLI
et al.
Oct 28, 2001
We develop an expansion for the Jacobian of the transformation from particlecoordinates to collective coordinates. As a demonstration, we use the lowestorder of the expansion in conjunction with a variational principle to obtainthe Percus Yevick equation for a monodisperse hard sphere system and theLebowitz equations for a polydisperse hard sphere system.
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Ferromagnetic Phase Transition in Barabasi-Albert Networks
Ute Habel
et al.
Dec 17, 2001
Ising spins put onto a Barabasi-Albert scale-free network show an effectivephase transition from ferromagnetism to paramagnetism upon heating, with aneffective critical temperature increasing as the logarithm of the system size.Starting with all spins up and upon equilibration pinning the fewmost-connected spins down nucleates the phase with most of the spins down.
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On the f Sum Rule and its Extensions
Rinaldo Cenni
et al.
Oct 10, 2000
The $f$ sum rule is derived in a non-relativistic frame and connected, viaWard Identities, to the low energy Thomson scattering. A generalisation toisospin symmetry in the nuclear case is discussed and linked to the MesonExchange Currents. The extension to a fully relativistic theory is thendiscussed and it is shown that the energy-weighted sum rule becomes a relationbetween the particle-hole and particle-antiparticle emission. Moreover thegeneralisation to isospin symmetry is also allowed and providesnon-perturbative results.
Nuclear Physics
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Nuclear Physics
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