Ingrid Fadelli is a writer for the website Phys.org.
Superconductors, materials that can conduct direct current electricity without energy loss, have been studied by physicists and material scientists. These materials could be used to generate energy for various systems.
A new mechanism for generating anisotropically-enhanced in-plane upper critical field in atomically thin centrosymmetric superconductors has been discovered by researchers in China. This mechanism was demonstrated on a thin layer of 2M-WS 2 in a paper published in Nature Physics.
Prof. K.T. Law wrote a paper in 2020 about spin-orbit-parity coupled superconductivity in 2D centrosymmetric superconductors.
SOPC is predicted to produce novel superconductivity near the topological band crossing with both largely enhanced and anisotropic spin susceptibility. After talking with Prof. K.T. Law, we felt that 2M-WS 2 was a promising candidate for superconductivity.
The material previously investigated by Prof. Law and his team is similar to the structure of monolayer 2M-WS2. The stacking mode of 2M-WS 2 distinguishes it from other transition metal dichalcogenide.
The bulk form of this material has a high transition temperature of 8.8 K.
The violation of the Pauli limit law was confirmed by the measurement of the in-plane upper critical field. The material had a two-fold symmetry in response to the magnetic field direction.
Experiments conducted under high in-plane magnetic fields showed that the gap in atomically thin 2M-WS 2 persists much above the Pauli limit. Using self-consistent mean-field calculations, our theoretical collaborators conclude that the unusual behaviors are the result of the strong spin-orbit-paritycoupling.
Several steps were used for the researchers' experiments. The team found that the in-plane critical field is far beyond the Pauli paramagnetic limit and that it exhibits a two-fold symmetry in response to the in-plane.
They used tunneling spectroscopy to measure the magnetic field. The gap in 2M-WS 2 has an anisotropic magnetic response which persists much above the Pauli limit.
The researchers performed a series of self-consistent mean-field calculations to better understand their sample. Based on their results, they concluded that these behaviors are the result of the strong spin-orbit-paritycoupling that arises from the topological band crossing in 2M-WS 2.
There is a new mechanism for generating anisotropically-enhanced in-plane upper critical field in atomically thin centrosymmetric superconductors that we discovered.
The novel properties found here reflect a strong SOPC inheriting from the normal state of 2M-WS 2 which had been ignored in previous studies of centrosymmetric superconductors.
More research teams worldwide have been exploring the properties and mechanisms of centrosymmetric superconducting transition metal dichalcogenide.
The recent paper byZhang and his colleagues could lead to the exploration of large enhanced and strongly anisotropic in-plane upper critical fields, which could further improve the understanding of these materials' exotic physics.
The plan is to explore the usual superconducting properties of more atomically thin centrosymmetric superconductors.
Nature Physics has more information about Spin–orbit–parity coupled superconductivity.
There is Spin-Orbit-Parity-Coupled Superconductivity in topological monolayer. There is a book titled "PhysRevLett.125.107001."
Journal information: Physical Review Letters , Nature Physics
There is a science network.
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