## Abstract

We have studied the flux line lattice in YNi2B2C and LuNi2B2C, the nonmagnetic end members of the borocarbide superconductors using small angle neutron scattering and transport. For fields, H parallel to c, we find a square symmetric lattice which disorders rapidly above H/H-c2 similar to 0.2, well below the ''peak effect'' at H/H-c2 = 0.9. The results for H/H-c2 < 0.2 can be understood within the collective pinning model, and are controlled by the tilt modulus c(44). For H/H-c2 > 0.2, the disordering appears to be associated with the field dependence of the shear modulus, C-66.

Original language | English |
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Journal | Physical Review Letters |

Volume | 79 |

Issue number | 3 |

Pages (from-to) | 487-490 |

ISSN | 0031-9007 |

DOIs | |

Publication status | Published - 1997 |

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