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

Abstract

We present a local probe study of the magnetic superconductor, ErNi${}_2$B${}_2$C, using magnetic force microscopy at sub-Kelvin temperatures. ErNi${}_2$B${}_2$C 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 $\lambda$ 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- and temperature dependence as well, and discuss the possibility of the purported spontaneous vortex formation.

References in corpus (8)

• A Common Thread: the pairing interaction for the unconventional superconductors
• Mechanics of Individual, Isolated Vortices in a Cuprate Superconductor
• Spontaneous vortex phase discovered?
• Direct measurement of the magnetic penetration depth by magnetic force microscopy
• Relation between cuprate superconductivity and magnetism: A Raman study of (CaLa)(BaLa)${}_2$Cu${}_3$O${}_y$
• Strong Enhancement of the Critical Current at the Antiferromagnetic Transition in ErNi2B2C Single Crystals
• Visualization of ferromagnetic domains in TbNi${}_2$B${}_2$C and ErNi${}_2$B${}_2$C single crystals: Weak ferromagnetism and its coexistence with superconductivity
• Observation of the spontaneous vortex phase in the weakly ferromagnetic superconductor ErNi${}_2$B${}_2$C: A penetration depth study

Cited by in corpus (6)

• Analysing Magnetism Using Scanning SQUID Microscopy
• Pure Odd Frequency Superconductivity at the Cores of Proximity Vortices
• Visualization of Magnetic Flux Structure in Phosphorus-Doped EuFe${}_2$As${}_2$ Single Crystals
• Observing the suppression of superconductivity in RbEuFe${}_4$As${}_4$ by correlated magnetic fluctuations
• Construction of a ${}^3$He magnetic force microscope with a vector magnet
• Local characterization of a heavy-fermion superconductor via sub-Kelvin magnetic force microscopy