Scanning Hall probe imaging of ErNi2B2C

Hendrik Bluhm, Suchitra E. Sebastian, Janice W. Guikema, I. R. Fisher, and Kathryn A. Moler
Phys. Rev. B 73, 014514 – Published 18 January 2006

Abstract

We report scanning Hall probe imaging of ErNi2B2C in the superconducting, antiferromagnetic, and weakly ferromagnetic regimes in magnetic fields up to 20 Oe, well below Hc1, with two results. First, imaging isolated vortices shows that they spontaneously rearrange on cooling through the antiferromagnetic transition temperature TN=6K to pin on twin boundaries, forming a striped pattern. Second, a weak, random magnetic signal appears in the ferromagnetic phase below TWFM=2.3K, and no spontaneous vortex lattice is present down to 1.9K. We conclude that ferromagnetism coexists with superconductivity either by forming small ferromagnetic domains or with oscillatory variation of the magnetization on sub-penetration-depth length scales.

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  • Received 2 July 2005

DOI:https://doi.org/10.1103/PhysRevB.73.014514

©2006 American Physical Society

Authors & Affiliations

Hendrik Bluhm, Suchitra E. Sebastian, Janice W. Guikema*, I. R. Fisher, and Kathryn A. Moler

  • Departments of Physics and Applied Physics, Stanford University, Stanford, California 94305, USA

  • *Present address: Department of Physics, Cornell University, Ithaca, NY 14853.
  • Electronic address: kmoler@stanford.edu

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Vol. 73, Iss. 1 — 1 January 2006

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