Session P12: Superconducting Materials
11:15 AM–2:15 PM, Wednesday, March 23, 2005
LACC Room: 402A
Sponsoring Unit:
DCMP
Chair: Myron Salamon, University of Illinois
Abstract ID: BAPS.2005.MAR.P12.12
Abstract: P12.00012 : Experimental observation of magic doping fractions and two-dimensional charge ordering in La$_{2-x}$Sr$_x$CuO$_4$
1:27 PM–1:39 PM
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Abstract 
Authors:
Seiki Komiya
(Central Research Institute of Electric Power Industry)
H.-D. Chen
S.-C. Zhang
(Stanford University)
Yoichi Ando
(Central Research Institute of Electric Power Industry)
Competing order is currently an issue of controversy in the study of high temperature superconductivity. In LSCO, neutron scattering experiments have found one-dimensional spin stripes; however, it is unclear whether LSCO has some sort of charge-ordered state. If there is a charge-ordered state in LSCO, the charge ordering tendency is expected to be pronounced near certain doping levels where the charge modulation is commensurate with the underlying lattice; therefore, to examine the nature of possible charge ordering in LSCO, we have carefully measured the hole-doping dependence of the in-plane resistivity using a series of high-quality single crystals. Our detailed measurements find a tendency toward charge ordering at particular rational hole doping fractions of 1/16, 3/32, 1/8, and 3/16. This observation is most consistent with a recent theoretical prediction of the checkerboard-type ordering of the Cooper pairs at rational doping fractions $x=(2m+1)/2^n$, with integers $m$ and $n$.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2005.MAR.P12.12