Spin-Stripe Density Varies Linearly With the Hole Content in Single-Layer Bi2+xSr2xCuO6+y Cuprate Superconductors

M. Enoki, M. Fujita, T. Nishizaki, S. Iikubo, D. K. Singh, S. Chang, J. M. Tranquada, and K. Yamada
Phys. Rev. Lett. 110, 017004 – Published 2 January 2013

Abstract

We have performed inelastic neutron scattering measurements on the single-layer cuprate Bi2+xSr2xCuO6+y (Bi2201) with x=0.2, 0.3, 0.4, and 0.5, a doping range that spans the spin-glass to superconducting phase boundary. The doping evolution of low energy spin fluctuations (11meV) was found to be characterized by a change in the incommensurate modulation wave vector from the tetragonal [110] to [100]/[010] directions, while maintaining a linear relation between the incommensurability and the hole concentration, δp. In the superconducting regime, the spectral weight is strongly suppressed below 4meV. Similarities and differences in the spin correlations between Bi2201 and the prototypical single-layer system La2xSrxCuO4 are discussed.

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  • Received 17 May 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.017004

© 2013 American Physical Society

Authors & Affiliations

M. Enoki1,*, M. Fujita2, T. Nishizaki2, S. Iikubo3, D. K. Singh4,5, S. Chang4, J. M. Tranquada6, and K. Yamada7

  • 1Department of Physics, Tohoku University, Sendai 980-8578, Japan
  • 2Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 3Kyushu Institute of Technology, Kitakyushu 808-0196, Japan
  • 4NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
  • 5Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20899, USA
  • 6Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
  • 7WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

  • *enoki@post.matsc.kyutech.ac.jp

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Vol. 110, Iss. 1 — 4 January 2013

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