Songxue Chi

Common Crystalline and Magnetic Structure of Superconducting A2Fe4Se5 (A=K,Rb,Cs,Tl) Single Crystals Measured Using Neutron Diffraction

Single-crystal neutron diffraction studies on superconductors A(2)Fe(4)Se(5), where A=Rb, Cs, (Tl, Rb), and (Tl, K) (T(c) ∼ 30 K), uncover the same Fe vacancy ordered crystal structure and the same block antiferromagnetic order as in K(2)Fe(4)Se(5). The Fe order-disorder transition occurs at T(S)=500-578 K, and the antiferromagnetic transition at T(N) = 471-559 K with an ordered magnetic moment ∼3.3μ(B)/Fe at 10 K. Thus, all recently discovered A intercalated iron selenide superconductors share the common crystalline and magnetic structure, which are very different from previous families of Fe-based superconductors, and constitute a distinct new 245 family.

Inelastic neutron-scattering measurements of a three-dimensional spin resonance in the FeAs-based BaFe1.9Ni0.1As2 superconductor.

We use inelastic neutron scattering to study magnetic excitations of the FeAs-based superconductor BaFe

Resonance in the electron-doped high-transition-temperature superconductor Pr0.88LaCe0.12CuO4-delta

_{1.9}

Role of random electric fields in relaxors

Ni

Structure and magnetic properties of the pyrochlore iridate Y2Ir2O7

_{0.1}

Double-Focusing Thermal Triple-Axis Spectrometer at the NCNR

As

Electron-doping evolution of the low-energy spin excitations in the iron arsenide superconductor BaFe2-xNixAs2

_2

Neutron Scattering Studies of spin excitations in hole-doped Ba0.67K0.33Fe2As2 superconductor

above and below its superconducting transition temperature

Conduction behavior of SrBi2Ta2O9 thin film grown by pulsed laser deposition

T_c=20

Disappearance of static magnetic order and evolution of spin fluctuations in Fe1+δSexTe1-x

K. In addition to gradually open a spin gap at the in-plane antiferromagnetic ordering wavevector