Hidden Quantum Spin-Gap State in the Static Stripe Phase of High-Temperature La2xSrxCuO4 Superconductors

M. Kofu, S.-H. Lee, M. Fujita, H.-J. Kang, H. Eisaki, and K. Yamada
Phys. Rev. Lett. 102, 047001 – Published 27 January 2009

Abstract

Low-energy spin excitations were investigated in the static stripe phase of La2xSrxCuO4 using elastic and inelastic neutron scattering on single crystals. For x=1/8 in which long-range static stripe order exists, an energy gap of Eg=4meV exists in the excitation spectrum in addition to strong quasielastic, incommensurate spin fluctuations associated with the static stripes. When x increases, the spectral weight of the spin fluctuations shifts from the quasielastic continuum to the excitation spectrum above Eg. The dynamic correlation length as a function of energy and the temperature evolution of the energy spectrum suggest a phase separation of two distinct magnetic phases in real space.

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  • Received 17 April 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.047001

©2009 American Physical Society

Authors & Affiliations

M. Kofu1, S.-H. Lee1, M. Fujita2, H.-J. Kang3, H. Eisaki4, and K. Yamada2

  • 1Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
  • 2Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 3NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
  • 4Nanoelectronic Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan

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Vol. 102, Iss. 4 — 30 January 2009

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