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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Eskildsen, M. R.
Gammel, P. L.
Barber, B. P.
Ramirez, A. P.
Bishop, D. J.
Andersen, N. H.
Mortensen, Kell
Bolle, C. A.
Lieber, C. M.
Canfield, P. C.
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https://doi.org/10.1103/PhysRevLett.79.487
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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.
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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