Diagonal and collinear incommensurate spin structures in underdopedLa2−xBaxCuO4 Academic Article uri icon

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abstract

  • We have studied incommensurate spin ordering in single crystal underdoped La_{2-x}Ba_{x}CuO_{4} with x~0.08, 0.05 and 0.025 using neutron scattering techniques. Static incommensurate magnetic order is observed in the La_{2-x}Ba_{x}CuO_{4} (x=0.05 and 0.025) compounds with ordering wavevectors which are rotated by 45 degree about the commensurate (0.5,0.5,0) position, with respect to that in the superconducting x=0.08 material. These spin modulations are one dimensional in the x=0.05 and 0.025 samples, with ordering wavevectors lying along the orthorhombic b* direction. Such a rotation in the orientation of the static spin ordering as a function of increasing Ba doping, from diagonal to collinear, is roughly coincident with the transition from an insulating to a superconducting ground state and is similar to that observed in the related La_{2-x}Sr_{x}CuO_{4} system. This phenomenon is therefore a generic property of underdoped La-214 cuprates.

authors

  • Dunsiger, SR
  • Zhao, Y
  • Gaulin, Bruce D
  • Qiu, Y
  • Bourges, P
  • Sidis, Y
  • Copley, JRD
  • Kallin, A
  • Mazurek, EM
  • Dabkowska, HA

publication date

  • September 1, 2008