講演情報
[20p-C501-11]Magnetic-field and current-direction dependence of the superconducting diode effect in superconductor Sn wires embedded in a Dirac semimetal thin film
〇Keita Ishihara1, Le Duc Anh1,2,3, Tomoki Hotta1, Masaaki Tanaka1,3 (1.Graduate School of Electrical Engineering and Information System, The University of Tokyo, 2.PRESTO, JST, 3.Center for Spintronics Research Network)
キーワード：
Superconductor、Dirac semimetal
Heterostructures of superconductor/topological materials generate attention as a platform of unconventional superconductivity. Previously, we have successfully fabricated superconducting β-Sn wire structures embedded in Topological Dirac semimetal α-Sn thin films by irradiating a focused ion beam (FIB) onto α-Sn. In these superconducting nanowires, we observe a large superconducting diode effect when a magnetic field is applied parallel to the nanowire structures.
To investigate the origin of the diode effect, we fabricate β-Sn nanowires whose directions are made along the [-110], [110] and [100] axes, respectively. For each nanowirerotate the magnetic field in-plane to measure the magnetic-field direction dependence of the nonreciprocal superconductivity. The results showed that regardless of the crystal orientation of the wire, large odd-function components are observed with the diode efficiency reaching up to 38% when the current I and the magnetic field H are parallel. Since this anisotropy is observed regardless of the crystal orientation of the β-Sn wires, this nonreciprocal superconductivity is expected to reflect the chiral anomaly of Dirac semimetals.
To investigate the origin of the diode effect, we fabricate β-Sn nanowires whose directions are made along the [-110], [110] and [100] axes, respectively. For each nanowirerotate the magnetic field in-plane to measure the magnetic-field direction dependence of the nonreciprocal superconductivity. The results showed that regardless of the crystal orientation of the wire, large odd-function components are observed with the diode efficiency reaching up to 38% when the current I and the magnetic field H are parallel. Since this anisotropy is observed regardless of the crystal orientation of the β-Sn wires, this nonreciprocal superconductivity is expected to reflect the chiral anomaly of Dirac semimetals.