Phys. Rev. Lett. 97, 016403 (2006) [4 pages]
Quantum Melting of the Hole Crystal in the Spin Ladder of Sr14-xCaxCu24O41
Abstract
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Citing Articles
A. Rusydi, 1,2 P. Abbamonte, 1,3 H. Eisaki, 4 Y. Fujimaki, 5 G. Blumberg, 6 S. Uchida, 5 and G. A. Sawatzky71National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York, 11973-5000, USA
2Materials Science Centre, University of Groningen, 9747 AG Groningen, The Netherlands
3Physics Department and Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana, Illinois, 61801, USA
4Nanoelectronics Research Institute, AIST, 1-1-1 Central 2, Umezono, Tsukuba, Ibaraki, 305-8568, Japan
5Department of Superconductivity, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
6Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey, 07974, USA
7Department of Physics and Astronomy, University of British Columbia, Vancouver, B.C., V6T-1Z1, Canada
Received 12 January 2006; published 7 July 2006
We have used resonant soft x-ray scattering to study the effects of discommensuration on the hole Wigner crystal (HC) in the spin ladder Sr14-xCaxCu24O41 (SCCO). As the hole density is varied the HC forms only with the commensurate wave vectors LL=1/5 and LL=1/3; for incommensurate values it "melts." A simple scaling between LL and temperature is observed,  1/3/1/5=5/3, indicating an inverse relationship between the interaction strength and wavelength. Our results suggest that SCCO contains hole pairs that are crystallized through an interplay between lattice commensuration and Coulomb repulsion, reminiscent of the "pair density wave" scenario.
©2006 The American Physical Society
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