Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 20: Symposium SYCM: Crystallography in materials science

HL 20.4: Hauptvortrag

Montag, 31. März 2014, 16:45–17:15, HSZ 02

Switching of magnetic domains reveals evidence for spatially inhomogeneous superconductivity — •Michel Kenzelmann — Paul Scherrer Institut

The interplay of magnetic and charge fluctuations can lead to novel quantum phases with exceptional electronic properties. Magnetic order in such quantum phases can fundamentally affect the underlying symmetry and generate new physical properties. Importantly, it has been predicted that spin-density wave (SDW) order in a singlet d-wave superconductor is coupled to triplet superconductivity. We performed neutron diffraction studies of the Q-phase SDW [1] in CeCoIn5, and we make two important observations [2]. We observe a complete and extremely sharp SDW domain switching that is unexplained by current microscopic theories for CeCoIn5. Using representational theory, we interpret our experimental results as evidence for the presence of p-wave superconductivity that coexists with d-wave superconductivity and SDW order. The triplet component is of p-wave symmetry, similar to that found in the A-phase of superfluid 3He, and is modulated as a Cooper pair density wave. Our findings identify the Q-phase as a unique quantum phase where d-wave and modulated p-wave superconductivity are coupled to SDW order, and which emerges in a magneto-superconducting quantum critical point [2].

[1] M. Kenzelmann et al, Science 321, 1652 (2008). [2] S. Gerber et al, submitted to Nature Physics (2013).

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