Scanning tunneling microscopy observation of a square abrikosov lattice in LuNi2B2C

Y. De Wilde, M. Iavarone, U. Welp, V. Metlushko, A. E. Koshelev, Igor Aronson, G. W. Crabtree, P. C. Canfield

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Abstract

We present scanning tunneling microscopy measurements of the (001) surface of a LuNi2B2C borocarbide single crystal at 4.2 K. In zero field, the conductance versus voltage characteristics recorded at various locations on the sample reproducibly provide a gap value of 2.2 meV. In a magnetic field of 1.5 and 0.375 T, the recordings of the conductance as a function of position reveal a regular square vortex lattice tilted by 45° with respect to the crystalline a axis. This unusual result is correlated with an in-plane anisotropy of the upper critical field Hc2(45°)/Hc2(0) = 0.92 at 4.2 K and is analyzed within the framework of Ginzburg-Landau theory.

Original languageEnglish (US)
Pages (from-to)4273-4276
Number of pages4
JournalPhysical Review Letters
Volume78
Issue number22
DOIs
StatePublished - Jan 1 1997

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    De Wilde, Y., Iavarone, M., Welp, U., Metlushko, V., Koshelev, A. E., Aronson, I., Crabtree, G. W., & Canfield, P. C. (1997). Scanning tunneling microscopy observation of a square abrikosov lattice in LuNi2B2C. Physical Review Letters, 78(22), 4273-4276. https://doi.org/10.1103/PhysRevLett.78.4273