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Viewpoint on 'Oscillating paramagnetic Meissner effect and Berezinskii-Kosterlitz-Thouless transition in underdoped BiSrCaCuO'.
Natl Sci Rev
January 2025
Department of Physics, KTH Royal Institute of Technology, Sweden.
The experimental team achieves impressive progress in detecting the signature of the local magnetic response of a system close to a phase transition.
View Article and Find Full Text PDFCritical Nematic Phase with Pseudogaplike Behavior in Twisted Bilayers.
Phys Rev Lett
December 2024
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
The crystallographic restriction theorem constrains two-dimensional nematicity to display either Ising (Z_{2}) or three-state-Potts (Z_{3}) critical behaviors, both of which are dominated by amplitude fluctuations. Here, we use group theory and microscopic modeling to show that this constraint is circumvented in a 30°-twisted hexagonal bilayer due to its emergent quasicrystalline symmetries. We find a critical phase dominated by phase fluctuations of a Z_{6} nematic order parameter and bounded by two Berezinskii-Kosterlitz-Thouless (BKT) transitions, which displays only quasi-long-range nematic order.
View Article and Find Full Text PDFA Two-Dimensional Superconducting Electron Gas at LaFeO/SrTiO Interfaces.
Nano Lett
January 2025
National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210023, P. R. China.
Transition metal oxide interfaces have garnered great attention due to their fascinating properties that are absent in their bulk counterparts. The high mobility and coexistence of superconductivity and magnetism at these interfaces remain compelling research topics. Here, we first report superconductivity in the 2DEG formed at the LaFeO/SrTiO interfaces, characterized by a superconducting transition temperature () of 333 mK and a superconducting layer thickness of 13.
View Article and Find Full Text PDFCompetition between Kardar-Parisi-Zhang and Berezinskii-Kosterlitz-Thouless kinetic roughening on (001) singular surface during steady crystal growth.
Sci Rep
November 2024
Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka, 816-8580, Japan.
Kinetic roughening of the (001) singular surface during steady crystal growth is studied on the basis of a lattice model using the Monte Carlo method. At a sufficiently low temperature, there are known to be two kinetic roughening points as the driving force for crystal growth increases. At a low driving force , there is the Karder-Parisi-Zhang (KPZ) roughening transition point.
View Article and Find Full Text PDFTwo-Dimensional Superconductivity and Anomalous Vortex Dissipation in Newly Discovered Transition Metal Dichalcogenide-Based Superlattices.
J Am Chem Soc
December 2024
Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China.
Properties of layered superconductors can vary drastically when thinned down from bulk to monolayer owing to the reduced dimensionality and weakened interlayer coupling. In transition metal dichalcogenides (TMDs), the inherent symmetry breaking effect in atomically thin crystals prompts novel states of matter such as Ising superconductivity with an extraordinary in-plane upper critical field. Here, we demonstrate that two-dimensional (2D) superconductivity resembling those in atomic layers but with more fascinating behaviors can be realized in the bulk crystals of two new TMD-based superconductors BaClTaS and BaClTaSe with superconducting transition temperatures 2.
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