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Spatially resolved penetration depth measurements and vortex manipulation in the ferromagnetic superconductor ErNi2B2C

TitleSpatially resolved penetration depth measurements and vortex manipulation in the ferromagnetic superconductor ErNi2B2C
Publication TypeJournal Article
Year of Publication2015
AuthorsWulferding, D, Yang, I, Yang, J, Lee, M, Choi, HC, Bud'ko, SL, Canfield, PC, Yeom, HW, Kim, J
JournalPhysical Review B
Volume92
Pagination014517
Date Published07
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000358841900002
Keywordscoexistence, magnetism, phase, single-crystals, state, temperature, vortices
Abstract

We present a local probe study of the magnetic superconductor ErNi2B2C, using magnetic force microscopy at sub-Kelvin temperatures. ErNi2B2C is an ideal system to explore the effects of concomitant superconductivity and ferromagnetism. At 500 mK, far below the transition to a weakly ferromagnetic state, we directly observe a structured magnetic background on the micrometer scale. We determine spatially resolved absolute values of the magnetic penetration depth. and study its temperature dependence as the system undergoes magnetic phase transitions from paramagnetic to antiferromagnetic, and to weak ferromagnetic, all within the superconducting regime. In addition, we estimate the absolute pinning force of Abrikosov vortices, which shows a position dependence and temperature dependence as well, and discuss the possibility of the purported spontaneous vortex formation.

DOI10.1103/PhysRevB.92.014517
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