Raymond L. Orbach

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A dynamical method is introduced to study the effect of dimensionality on phase transitions. Direct experimental measurements for the lower critical dimension for spin glasses is provided as an example. The method makes use of the spin glass correlation length ξ(t,T). Once nucleated, it can become comparable to sample dimensions in convenient time and(More)
IT WAS WITH A MIXTURE OF ASTONISHMENT AND DISMAY THAT I WATCHED AS THE U.S. HOUSE OF Representatives approved H.R. 1, a bill to fund the federal government for the rest of the 2011 fi scal year. Left intact, the massive cuts in research contained in the bill passed on 19 February would effectively end America's legendary status as the leader of the(More)
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We have studied the effects of microwave radiation on superconducting tunnel ]unctions and on the critical currents of superconducting strips at 2.0 and 10.0 GHz. In the tunnel ]unctions both quantum mechanical and classical effects (photon-induced tunneling and classical rectification, respectively), were observed, but not gap enhancement. The application(More)
We measure the field dependence of spin glass free energy barriers in a thin amorphous Ge:Mn film through the time dependence of the magnetization. After the correlation length ξ(t,T) has reached the film thickness L=155  Å so that the dynamics are activated, we change the initial magnetic field by δH. In agreement with the scaling behavior exhibited in a(More)
Acknowledgement The ORNL research staff who were responsible for organizing the Workshop and assembling this report gratefully acknowledge the contributions of all the workshop participants to the success of the meeting, and to the technical and editorial content of the report. In particular, those members of the International Advisory Committee who served(More)
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