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Research Activity

HT2

Superconductivity

One of the most challenging tasks of solid-state physics today is to understand the mechanism for superconductivity in cuprates. These materials, which have a relatively high critical temperature Tc, are based on doped CuO2 planes. Since at zero doping they are antiferromagnets, several theories ascribe their superconductivity to holes interacting via a magnetic medium. Yet the phenomenon of superconductivity begins at doping levels in which magnetism almost disappears, and therefore there is no clear evidence relating the two. 

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Magnetic Quantum Tunneling

High spin molecules (HSM) are molecules consisting of ions coupled by ferromagnetic or antiferromagnetic interaction; these molecules crystallize in a lattice where neighboring molecules are very well separated, yielding at low temperatures (temperatures lower than the magnetic interaction between ions) molecules that behave like noninteracting giant spins.

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Frustrated magnets

This research project is funded by the United States Israel Binational Science Foundation. The project name is Degenerate Magnets: A Study by Local Probes, and it duration is 1998-2001. The principal investigators are: A. Keren (Technion), Y. J. Uemura and G. M. Luke (Columbia Univ.).

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Spin Glasses

Spin glasses

Traditionally, the spin lattice relaxation time of a muon in a magnetic environment, also known as T1, is interpreted using the concept of spin correlation time. However, in some situations, no correlation time could be assigned to the spins, and a different interpretation of T1 is required. Our group recently developed such an interpretation. As a test case spin glasses where chosen since the theoretical expectation is for a time scale invariant spin evolution over a few decades. Indeed, the experiments show that the spin correlation function is best described by a product of a power law and a cut-off functions and that the slowing down spin fluctuations are manifested essentially by the temperature dependence of the power law term.

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