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

High Field Magnet Laboratory (HFML-EMFL), Radboud University, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands
Radboud University, Institute for Molecules and Materials, 6525 AJ Nijmegen, The Netherlands
Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, D-01187 Dresden, Germany
Author to whom correspondence should be addressed.
Current address: Laboratory of Quantum Materials (QMAT), Institute of Materials (IMX), École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.
Current address: Center for Nanotechnology Innovation @NEST-Istituto Italiano di Tecnologia, Piazza San Silvestro 12, 56127 Pisa, Italy.
Crystals 2020, 10(4), 288;
Received: 5 March 2020 / Revised: 1 April 2020 / Accepted: 4 April 2020 / Published: 10 April 2020
(This article belongs to the Special Issue Synthesis and Characterization of New Superconductors Materials)
The motivation to search for signatures of superconductivity in Weyl 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-I Weyl 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, T c , 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. View Full-Text
Keywords: superconductivity; Weyl semimetal; focused ion beam superconductivity; Weyl semimetal; focused ion beam
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MDPI and ACS Style

van Delft, M.R.; Pezzini, S.; König, M.; Tinnemans, P.; Hussey, N.E.; Wiedmann, S. Two- and Three-Dimensional Superconducting Phases in the Weyl Semimetal TaP at Ambient Pressure. Crystals 2020, 10, 288.

AMA Style

van Delft MR, Pezzini S, König M, Tinnemans P, Hussey NE, Wiedmann S. Two- and Three-Dimensional Superconducting Phases in the Weyl Semimetal TaP at Ambient Pressure. Crystals. 2020; 10(4):288.

Chicago/Turabian Style

van Delft, Maarten R., Sergio Pezzini, Markus König, Paul Tinnemans, Nigel E. Hussey, and Steffen Wiedmann. 2020. "Two- and Three-Dimensional Superconducting Phases in the Weyl Semimetal TaP at Ambient Pressure" Crystals 10, no. 4: 288.

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