Pressure-induced superconductivity at 32 K in MoB.

Since the discovery of superconductivity in MgB ( ∼ 39 K), the search for superconductivity in related materials with similar structures or ingredients has never stopped. Although about 100 binary borides have been explored, only a few of them show superconductivity with relatively low . In this work, we report the discovery of superconductivity up to 32 K, which is the highest in transition-metal borides, in MoB under pressure.

Relationship between Antisite Defects, Magnetism, and Band Topology in MnSbTe Crystals with ≈ 40 K.

MnSbTe has attracted extensive attention because of its rich and adjustable magnetic properties. Here, using a modified crystal growth method, ferrimagnetic MnSbTe crystals with enhanced Curie temperature () of about 40 K with dominant hole-type carriers and intrinsic anomalous Hall effect is obtained. Time- and angle-resolved photoemission spectroscopy reveals that surface states are absent in both antiferromagnetic and ferrimagnetic MnSbTe, implying that they have topologically trivial electronic structures.

Charge-Density-Wave-Induced Peak-Dip-Hump Structure and the Multiband Superconductivity in a Kagome Superconductor CsV_{3}Sb_{5}.

The entanglement of charge density wave (CDW), superconductivity, and topologically nontrivial electronic structure has recently been discovered in the kagome metal AV_{3}Sb_{5} (A=K, Rb, Cs) family. With high-resolution angle-resolved photoemission spectroscopy, we study the electronic properties of CDW and superconductivity in CsV_{3}Sb_{5}. The spectra around K[over ¯] is found to exhibit a peak-dip-hump structure associated with two separate branches of dispersion, demonstrating the isotropic CDW gap opening below E_{F}.

Evolution of Electronic Structure in Pristine and Rb-Reconstructed Surfaces of Kagome Metal RbVSb.

We report on low-temperature (4 K) scanning tunneling microscope measurements of atomic and electronic structures of the cleaved surfaces of an alkali-based kagome metal RbVSb single crystals. We find that the dominant pristine surface exhibits Rb-1×1 structure, in which a unique unidirectional √3 charge order is discovered. As the sample temperature slightly rises, Rb-√3×1 and Rb-√3×√3 reconstructions form due to desorption of surface Rb atoms.

Quantum Transport Evidence of Topological Band Structures of Kagome Superconductor CsV_{3}Sb_{5}.

We report the transport properties of kagome superconductor CsV_{3}Sb_{5} single crystals at magnetic field up to 32 T. The Shubnikov-de Haas oscillations emerge at low temperature and four frequencies of F_{α}=27  T, F_{β}=73  T, F_{ε}=727  T, and F_{η}=786  T with relatively small cyclotron masses are observed. For F_{β} and F_{ε}, the Berry phases are close to π, providing clear evidence of nontrivial topological band structures of CsV_{3}Sb_{5}.

Roton pair density wave in a strong-coupling kagome superconductor.

The transition metal kagome lattice materials host frustrated, correlated and topological quantum states of matter. Recently, a new family of vanadium-based kagome metals, AVSb (A = K, Rb or Cs), with topological band structures has been discovered. These layered compounds are nonmagnetic and undergo charge density wave transitions before developing superconductivity at low temperatures.

Superconducting properties of MgCu-type Laves phase compounds SrRh and BaRh.

We report a systematic study on the superconducting properties of MgCu-type Laves phase compounds SrRh and BaRh. SrRh and BaRh exhibit superconducting transitions atT = 5.4 K and 5.

Anomalous Dome-like Superconductivity in RE(CuNi)AsO (RE = La, Pr, Nd).

A significant manifestation of interplay of superconductivity and charge density wave, spin density wave, or magnetism is a dome-like superconducting critical temperature (T) in cuprate, iron-based, and heavy Fermion superconductors. Pesudogap, quantum critical point, and strange metals emerge in different doping ranges. Exploring dome-like T in new superconductors is of interest to detect emergent effects.

Structure and Transport Properties in Itinerant Antiferromagnet RE(NiCu )AsO (RE = Ce, Sm).

We report the crystal structure and physical properties of two NiAs-based compounds RENiAsO (RE = Ce, Sm). The former exhibits structural phase transition from tetragonal (space group I4/ mmm, 139) to orthorhombic (space group Immm, 71) symmetry at 230 K, while the latter undergoes a charge-density-wave-like structural distortion with abrupt change of Ni-As bond length. Both compounds show antiferromagnetic transitions due to RE ions ordering at 4.

[Numerical simulation of TP transport after overflow of rainwater into urban lake].

Based on the three-dimensional advection-diffusion-reflection equation, a two-dimensional TP transport equation was deduced to simulate TP distribution and transport after overflow rainwater into urban lake from storm sewer system during rainstorm. The model has a good agreement with a group of monitor data at Lake Lichee in Shenzhen, China. The model was applied to compute the scenario in Lake Lichee under the design rainstorm, and analyse the fate of TP.