Nai-Chang Yeh
Professor of Physics,
California Institute of Technology
Ph.D., Massachusetts Institute of Technology
B.Sc., National Taiwan University
Experiments in superconductivity, magnetism and other strongly correlated electronic systems; scanning probe microscopy; nano-science/technology; low-temperature phases of helium; development of superconducting cavity-stabilized oscillators.
From left to right, front row: Slobodan, Prof. Yeh, Jenelyn, Peter; back row: Marcus, Cameron, Andrew, Nils, and Kevin
Recent research highlights
Spatially resolved spectroscopy of vortices in YBa2Cu3Ox (hole-doped) and La0.1Sr0.9CuO2 (electron-doped) cuprates.
The above data shows spectra inside and outside of vortices in hole-doped YBa2Cu3O(Y-123, TC=93K) and electron-doped La0.1Sr0.9CuO2 (La-112, TC=43K). in a magnetic field below TC. This data shows the first observation of vortices in an electron-doped cuprate. The persistence of a gap inside vortices in both hole- and electron-doped cuprates is unconventional when compared to simple BCS superconductors such as NbSe2 and may possibly be explained by the presence of competing orders, such as spin- and charge-density waves, coexisting with superconductivity in the cuprate superconductors that remain present even when superconductivity is suppressed in vortices. [Data from: A. D. Beyer, C.-T. Chen, M. S. Grinolds, M. L. Teague, and N.-C. Yeh. Physica C 468, pg. 471--479 (2008); [cond-mat/0610855].] For more images, please see this link.
Contact Information:
114 Sloan AnnexCalifornia Institute of Technology
MC 114-36
Pasadena, CA 91125
(626) 395-4313
ncyeh@caltech.edu
