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Superconducting gap and vortex lattice of the heavy-fermion compound CeCu2Si2

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Seiro,  Silvia
Silvia Seiro, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Geibel,  Christoph
Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Wirth,  Steffen
Steffen Wirth, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich,  Frank
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Enayat, M., Sun, Z., Maldonado, A., Suderow, H., Seiro, S., Geibel, C., et al. (2016). Superconducting gap and vortex lattice of the heavy-fermion compound CeCu2Si2. Physical Review B, 93(4): 045123, pp. 1-5. doi:10.1103/PhysRevB.93.045123.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0029-ABF7-F
Abstract
The order parameter and pairing mechanism for superconductivity in heavy-fermion compounds are still poorly understood. Scanning tunneling microscopy and spectroscopy at ultralow temperatures can yield important information about the superconducting order parameter and the gap structure. Here, we study the first heavy-fermion superconductor, CeCu2Si2. Our data show the superconducting gap which is not fully formed and exhibits features that point to a multigap order parameter. Spatial mapping of the zero-bias conductance in magnetic field reveals the vortex lattice, which allows us to unequivocally link the observed conductance gap to superconductivity in CeCu2Si2. The vortex lattice is found to be predominantly triangular with distortions at fields close to similar to 0.7H(c2).