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Condensed Matter Seminars

ics Condensed Matter
Thursday, March 31, 2005
4:00 PM
Physics Building, Room 204
Note special time.
Note special room.
Pengcheng Dai [Host: Seung-Hun Lee]
University of Tennessee/Oak Ridge National Laboratory
"Antiferromagnetic Order as a Competing Ground State in Electron-doped High -Tc Superconductors"
ABSTRACT:
In this talk, I will summarize recent progress on using neutron scattering to study electron-doped high-Tc superconductors. As a function of increasing doping, the as-grown antiferromagnetic (AF) insulator Pr0.88LaCe0.12CuO4 (PLCCO) can be transformed into a Tc=25 K superconductor without AF order by annealing at different temperatures. We find that underdoped PLCCO's are electronically phase separated with a three dimensional AF phase, a quasi-two-dimensional (2D) spin density wave, and a superconducting phase. An applied external field that suppresses superconductivity also enhances the quasi-2D spin density wave order, thus suggesting AF order is a competing phase for superconductivity in these materials.

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