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Graham Kimbell

Research Interests

Superconducting spintronics

I am creating epitaxial oxide heterostructures using pulsed laser deposition in order to investigate triplet superconductivity.

The conversion from singlet to triplet Cooper pairs has been shown to occur when pairs experience a magnetic inhomogeneity1. Conflicting studies have shown evidence2 or lack thereof3 for a 'spin active' interface between a high temperature superconductor (YBa2Cu3O7-d) and half-metallic ferromagnet (La1-xCaxMnO3), in which singlet-triplet conversion can take place without any engineered inhomogeneity. In the SrRuO3/manganite system, a magnetic non-collinearity has been shown to form in the SrRuO3 due to a competition between magnetocrystalline anisotropy and antiferromagnetic interfacial exchange coupling4. I am interested in determining whether this intentional magnetic non-collinearity enhances singlet-triplet conversion in all oxide Josephson junctions.

[1]   F. S. Bergeret et al., Phys. Rev. Lett. 86, 4096 (2001).
[2]   C. Visani et al., Nat. Phys. 8, nphys2318 (2012).
[3]   A. M. Petrzhik et al., J. Exp. Theor. Phys. 112, 1042 (2011).
[4]   X. Ke et al., Phys. Rev. Lett. 110, 237201 (2013).