Neutron Scattering Study of Magnetic Field Effect on the Stripe Order in LBCO

ORAL

Abstract

We have been investigating the relationship of stripe order to high-temperature superconductivity in cuprates. In particular, our neutron scattering results indicate that spin-stripe order is present in La$_{2-x}$Ba$_{x}$CuO$_{4}$ (LBCO) over a substantial range of doping about x = 1/8, where the bulk superconductivity is anomalously suppressed. Focusing on the x = 1/8 composition, we have recently studied the impact on stripe order of a magnetic field applied along the c-axis [1]. Applying a field up to 7 T, we observed a small enhancement of the intensity of the incommensurate antiferromagnetic superlattice peaks and a slight increase in the ordering temperature. In measurements of the spin dynamics, the field had no significant impact on the small spin gap ($\sim $ 0.5 meV) found in the ordered phase [2]. [1] Jinsheng Wen \textit{et al}., arXiv:0810.4085. [2] J.M. Tranquada \textit{et al}., arXiv:0809.0711. Work supported by Office of Science, U.S. DOE, under Contract No. DEAC02-98CH10886

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Authors

  • G.D. Gu

    CMP\&MS, Brookhaven National Laboratory, NY 11973, USA, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA, BNL, Brookhaven National Laboratory, Brookhaven Natl. Lab., CMPMSD, Brookhaven National Laboratory

  • Z. J. Xu

    CMP\&MS, BNL, Brookhaven National Lab, BNL, Brookhaven National Laboratory

  • J. S. Wen

    CMP\&MS, BNL, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA, Brookhaven National Lab, BNL, Brookhaven National Laboratory

  • G.Y. Xu

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA, Brookhaven National Lab, BNL, Brookhaven Natl. Lab.

  • M. Huecker

    BNL, Brookhaven National Laboratory, Brookhaven Natl. Lab.

  • John Tranquada

    CMP\&MS, BNL, BNL, Brookhaven National Laboratory, Brookhaven Natl. Lab.