Uniaxial Strain and Hydrostatic Pressure Engineering of the Hidden Magnetism in LaCaMnO (0 ≤ ≤ 1/2) Thin Films.

Here, using various substrates, we demonstrate that the in-plane uniaxial strain engineering can enhance the Jahn-Teller distortions and promote selective orbital occupancy to induce an emergent antiferromagnetic insulating (AFI) phase at = 1/3 of LaCaMnO. Such an AFI phase depends not only on the magnitude of epitaxial strain but also on the symmetry of the substrates. Using the large uniaxial strain imparted by DyScO(001) substrate, the AFI ground state is achieved in a wide range of doping levels (0 ≤ ≤ 1/2), leaving an extended AFI phase diagram.

Pressure-Tuned Intralayer Exchange in Superlattice-Like MnBiTe/(BiTe) Topological Insulators.

The magnetic structures of MnBiTe(BiTe) can be manipulated by tuning the interlayer coupling via the number of BiTe spacer layers , while the intralayer ferromagnetic (FM) exchange coupling is considered too robust to control. By applying hydrostatic pressure up to 3.5 GPa, we discover opposite responses of magnetic properties for = 1 and 2.

Drive the Dirac electrons into Cooper pairs in SrBiSe.

Topological superconductors are a very interesting and frontier topic in condensed matter physics. Despite the tremendous efforts in exploring topological superconductivity, its presence is however still under heavy debate. The Dirac electrons have been proven to exist on the surface of a topological insulator.

Superconductivity with Topological Surface State in SrxBi₂Se₃.

By intercalation of alkaline earth metal Sr in Bi2Se3, superconductivity with large shielding volume fraction (∼91.5% at 0.5 K) has been achieved in Sr0.