Wednesday, December 13, 2006, 11:00 am — Hamilton Seminar Room, Bldg. 555
After a brief overview of recent achievements at the National High Magnetic Field Laboratory (MagLab) using our pulsed, powered, and persistent magnets, I will focus on a series of my own experiments that utilized 60T pulsed magnetic fields to suppress the superconducting state in the high-temperature superconductors. The pulsed magnets are operated to the point of catastrophic stress failure...and occasionally, inadvertently, beyond. Oddly, however, they seem to offer the gentlest way to reveal the low-temperature normal-state behavior of the cuprates in the absence of superconductivity. Evidence from resistivity measurements suggests a metal-insulator transition underlying the superconducting state. More recently [Nature 424, 912 (2003) and unpublished], we report Hall effect measurements that show a cusp in the low-temperature Hall number at optimum doping, as if the system has a phase transition at optimum doping, the same doping at which superconductivity is optimized.
A collaboration with F.F. Balakirev, J.B. Betts, A. Migliori (Los Alamos) and S. Ono, T. Murayama, Yoichi Ando (Tokyo)
Hosted by: Ivan Bozovic
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