Publication: Structural stability of the square flux line lattice in YNi 2 B 2 C and LuNi 2 B 2 C studied with small angle neutron scattering
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Date
1997
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American Physical Society
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Eskildsen, M. R., P. L. Gammel, B. P. Barber, A. P. Ramirez, D. J. Bishop, N. H. Andersen, K. Mortensen, C. A. Bolle, C. M. Lieber, and P. C. Canfield. 1997. “Structural Stability of the Square Flux Line Lattice in YNi 2 B 2 C and LuNi 2 B 2 C Studied with Small Angle Neutron Scattering.” Physical Review Letters 79 (3): 487–90. https://doi.org/10.1103/physrevlett.79.487.
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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.
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