Electronic correlations stemming from nearly flat bands in van der Waals materials have demonstrated to be a powerful playground to engineer artificial quantum matter, including superconductors, correlated insulators and topological matter. This phenomenology has been experimentally observed in a variety of twisted van der Waals materials, such as graphene and dichalcogenide multilayers. Here we show that spontaneously buckled graphene can yield a correlated state, emerging from an elastic pseudo Landau level. Our results build on top of recent experimental findings reporting that, when placed on top of hBN or NbSe2 substrates, wrinkled graphene sheets relax forming a periodic, long-range buckling pattern. The low-energy physics can be accurately described by electrons in the presence of a pseudo-axial gauge field, leading to the formation of sublattice-polarized Landau levels. Moreover, we verify that the high density of states at the zeroth Landau level leads to the formation of a periodically modulated ferrimagnetic groundstate, which can be controlled by the application of external electric fields. Our results indicate that periodically strained graphene is a versatile platform to explore emergent electronic states arising from correlated elastic Landau levels.
a b s t r a c tIn this work the Ti 2 InN phase is investigated by X-ray diffraction, magnetic and resistivity measurements. X-ray powder patterns suggest that all peaks can be indexed with the hexagonal phase of Cr 2 AlC prototype. Electrical resistance as a function of temperature reveals superconductivity below 7.3 K. M(H) hysteresis loops show typical type-II superconductivity. Using R(H) versus T measurements we estimated
MgB 2 is considered to be an important conductor for applications. Optimizing flux pinning in these conductors can improve their critical currents. Doping can influence flux pinning efficiency and grain connectivity, and also affect the resistivity, upper critical field and critical temperature. This study was designed to attempt the doping of MgB 2 on the Mg sites with metal-diborides using high-energy ball milling. MgB 2 samples were prepared by milling pre-reacted MgB 2 and TaB 2 powders using a Spex 8000M mill with WC jars and balls in a nitrogen-filled glove box. The mixing concentration in (Mg 1 x Ta x )B 2 was up to x = 0 10. Samples were removed from the WC jars after milling times up to 4000 minutes and formed into pellets using cold isostatic pressing. The pellets were heat treated in a hot isostatic press (HIP) at 1000 C under a pressure of 30 kpsi for 24 hours. The influence that milling time and TaB 2 addition had on the microstructure and the resulting superconducting properties of TaB 2 -added MgB 2 is discussed. Improvement of at high magnetic fields and of pinning could be obtained in milled samples with added TaB 2 . The sample with added 5at %TaB 2 and milled for 300 minutes showed values of 7 10 5 A cm 2 and 14GN m 3 at 2 T, 4.2 K. The milled and TaB 2 -mixed samples showed higher values of 0 than the unmilled-unmixed sample. Index Terms-Addition of diborides, high-energy ball milling, MgB 2 , microstructural and superconducting characterization.
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