Lingyi Xing

Visualization of electron nematicity and unidirectional antiferroic fluctuations at high temperatures in NaFeAs

Superconductivity in iron pnictides seems to be related to the formation of electronic nematic phases that break the rotational symmetry of the crystal lattice. But the nematic phase in NaFeAs is now shown to persist at high temperatures owing to the presence of antiferroic fluctuations.

Superconductivity in Strong Spin Orbital Coupling Compound Sb2Se3

Recently, A2B3 type strong spin orbital coupling compounds such as Bi2Te3, Bi2Se3 and Sb2Te3 were theoretically predicated to be topological insulators and demonstrated through experimental efforts. The counterpart compound Sb2Se3 on the other hand was found to be topological trivial, but further theoretical studies indicated that the pressure might induce Sb2Se3 into a topological nontrivial state. Here, we report on the discovery of superconductivity in Sb2Se3 single crystal induced via pressure. Our experiments indicated that Sb2Se3 became superconductive at high pressures above 10 GPa proceeded by a pressure induced insulator to metal like transition at ~3 GPa which should be related to the topological quantum transition. The superconducting transition temperature (TC) increased to around 8.0 K with pressure up to 40 GPa while it keeps ambient structure. High pressure Raman revealed that new modes appeared around 10 GPa and 20 GPa, respectively, which correspond to occurrence of superconductivity and to the change of TC slop as the function of high pressure in conjunction with the evolutions of structural parameters at high pressures.

Extraordinary Doping Effects on Quasiparticle Scattering and Bandwidth in Iron-Based Superconductors

Z. R. Ye,1 Y. Zhang,1 F. Chen,1 M. Xu,1 J. Jiang,1 X. H. Niu,1 C. H. P. Wen,1 L. Y. Xing,2 X. C. Wang,2 C. Q. Jin,2 B. P. Xie,1, ∗ and D. L. Feng1, † 1State Key Laboratory of Surface Physics, Department of Physics, and Advanced Materials Laboratory, Fudan University, Shanghai 200433, People’s Republic of China 2Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China (Dated: April 29, 2014)

Orbital order and spin nematicity in the tetragonal phase of the electron-doped iron pnictides NaFe 1 − x Co x As

In copper-oxide and iron-based high-temperature (high-

Orbital Selective Spin Excitations and their Impact on Superconductivity of LiFe1-xCoxAs

{T}_{\mathrm{c}})

The anomaly Cu doping effects on LiFeAs superconductors

superconductors, many physical properties exhibit in-plane anisotropy, which is believed to be caused by a rotational symmetry-breaking nematic order, whose origin and its relationship to superconductivity remain elusive. In many iron pnictides, a tetragonal-to-orthorhombic structural transition temperature

Orbital-differentiated coherence-incoherence crossover identified by photoemission spectroscopy in LiFeAs

{T}_{\mathrm{s}}

Coexistence of clean- and dirty-limit superconductivity in LiFeAs

coincides with the magnetic transition temperature

Spin-Fluctuation-Induced Non-Fermi-Liquid Behavior with Suppressed Superconductivity in LiFe 1 − x Co x As

{T}_{\mathrm{N}}

Small and nearly isotropic hole-like Fermi surfaces in LiFeAs detected through de Haas--van Alphen effect

, making the orbital and spin degrees of freedom highly entangled. NaFeAs is a system where