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Large superconducting diode effect in ion-beam patterned Sn-based superconductor nanowire/topological Dirac semimetal planar heterostructures.
Nat Commun
September 2024
Department of Electrical Engineering and Information Systems, The University of Tokyo, Bunkyo-ku, Tokyo, Japan.
High-quality superconductor/topological material heterostructures are highly desired for realisation of topological superconductivity and Majorana physics. Here, we demonstrate a method to directly draw nanoscale superconducting β-Sn patterns in the plane of a topological Dirac semimetal (TDS) α-Sn thin film by irradiating a focused ion beam and taking advantage of the heat-driven phase transition of α-Sn into superconducting β-Sn. The β-Sn nanowires embedded in a TDS α-Sn thin film exhibit a large superconducting diode effect (SDE), whose rectification ratio η reaches a maximum of 35% when the magnetic field is applied parallel to the current.
View Article and Find Full Text PDFPlanar thermal Hall effect from phonons in a Kitaev candidate material.
Nat Commun
April 2024
Institut quantique, Département de physique & RQMP, Université de Sherbrooke, Sherbrooke, QC, Canada.
The thermal Hall effect has emerged as a potential probe of exotic excitations in spin liquids. In the Kitaev magnet -RuCl, the thermal Hall conductivity has been attributed to Majorana fermions, chiral magnons, or phonons. Theoretically, the former two types of heat carriers can generate a "planar" , whereby the magnetic field is parallel to the heat current, but it is unknown whether phonons also could.
View Article and Find Full Text PDFMajorana-fermion origin of the planar thermal Hall effect in the Kitaev magnet α-RuCl.
Sci Adv
March 2024
Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan.
The field-induced quantum-disordered state of layered honeycomb magnet α-RuCl is a prime candidate for Kitaev spin liquids hosting Majorana fermions and non-Abelian anyons. Recent observations of anomalous planar thermal Hall effect demonstrate a topological edge mode, but whether it originates from Majorana fermions or bosonic magnons remains controversial. Here, we distinguish these origins from combined low-temperature measurements of high-resolution specific heat and thermal Hall conductivity with rotating magnetic fields within the honeycomb plane.
View Article and Find Full Text PDFSuperconductivity in the High-Entropy Ceramics Ti Zr Nb Mo Ta C with Possible Nontrivial Band Topology.
Adv Sci (Weinh)
February 2024
School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, Sun Yat-Sen University, No. 135, Xingang Xi Road, Guangzhou, 510275, China.
Topological superconductors have drawn significant interest from the scientific community due to the accompanying Majorana fermions. Here, the discovery of electronic structure and superconductivity (SC) in high-entropy ceramics Ti Zr Nb Mo Ta C (x = 1 and 0.8) combined with experiments and first-principles calculations is reported.
View Article and Find Full Text PDFKondo screening in a Majorana metal.
Nat Commun
November 2023
Department of Physics, Sungkyunkwan University, Suwon, 16419, Republic of Korea.
Kondo impurities provide a nontrivial probe to unravel the character of the excitations of a quantum spin liquid. In the S = 1/2 Kitaev model on the honeycomb lattice, Kondo impurities embedded in the spin-liquid host can be screened by itinerant Majorana fermions via gauge-flux binding. Here, we report experimental signatures of metallic-like Kondo screening at intermediate temperatures in the Kitaev honeycomb material α-RuCl with dilute Cr (S = 3/2) impurities.
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