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Journal Article

Two- and Three-Dimensional Superconducting Phases in the Weyl Semimetal TaP at Ambient Pressure


König,  Markus
Markus König, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Van Delft, M. R., Pezzini, S., König, M., Tinnemans, P., Hussey, N. E., & Wiedmann, S. (2020). Two- and Three-Dimensional Superconducting Phases in the Weyl Semimetal TaP at Ambient Pressure. Crystals, 10: 288, pp. 1-12. doi:10.3390/cryst10040288.

Cite as: https://hdl.handle.net/21.11116/0000-0006-52C3-1
The motivation to search for signatures of superconductivity inWeyl semi-metals and other topological phases lies in their potential for hosting exotic phenomena such as nonzero-momentum pairing or the Majorana fermion, a viable candidate for the ultimate realization of a scalable quantum computer. Until now, however, all known reports of superconductivity in type-IWeyl semi-metals have arisen through surface contact with a sharp tip, focused ion-beam surface treatment or the application of high pressures. Here, we demonstrate the observation of superconductivity in single crystals, even an as-grown crystal, of the Weyl semi-metal tantalum phosphide (TaP), at ambient pressure. A superconducting transition temperature, Tc, varying between 1.7 and 5.3 K, is observed in different samples, both as-grown and microscopic samples processed with focused ion beam (FIB) etching. Our data show that the superconductivity present in the as-grown crystal is inhomogeneous yet three-dimensional. For samples fabricated with FIB, we observe, in addition to the three-dimensional superconductivity, a second superconducting phase that resides on the sample surface. Through measurements of the characteristic fields as a function of temperature and angle, we are able to confirm the dimensionality of the two distinct superconducting phases. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.