Welcome to the Neutron Scattering Group!

 

We were established in the year of 2013 when the PI returned from USA. We are utilizing neutron scattering technique combined with other probes such as X-ray scattering and transport to study the strongly correlated electronic systems, and synthesizing large-size high-quality samples. Please contact us for any questions or collaboration opportunities.

Updates

2015-06-02

Papers published as tributes to the Centenary of our Physics Department

 

Our group published a paper titled "Magnetic neutron scattering studies on the Fe-based superconductor system Fe1+yTe1-xSex" on Annals of Physics as a tribute to the centenary of our Physics Department. The Chinese version of the article was published on Acta Physics Sinica. In this paper, we present a brief overview on the interplay between magnetism and superconductivity in one of the Fe-based superconductor systems, Fe1+yTe1-xSex. We conclude that magnetism and superconductivity in this system couple to each other closely, while the static magnetic order around (0.5, 0) competes with superconductivity, the spin excitations around (0.5, 0.5) may be an important ingredient for it. We also discuss the nature of magnetism and substitution effects of 3d transition metals.

2015-01-15

Floating-zone furnace ready for use

 

A floating-zone furnace has been installed at our lab and is ready for use. It is equipped with two ellipsoidal mirrors, which reflect light emitted from two Halogen lamps to melt the raw materials. The melted zone is held by surface tension only, and for this reason this technique is termed "floating-zone" technique. Crystal growth is initiated by a slow downward translation of the feed rod mounted on the upper shaft and the seed rod on the lower shaft. It is suitable for growing precisely controlled stoichiometry single crystals with high melting point (can reach above 2000 C), for example, high-temperature cuprate superconductors.

2015-01-06

Effects of 3d transition metal substitution in the Fe-based superconductors

 

Our group published a paper titled "Substitution of Ni for Fe in superconducting Fe0.98Te0.5Se0.5 depresses the normal-state conductivity but not the magnetic spectral weight" on PRB. In this work, we study the Ni-substitution effects on the electronic and magnetic properties of an Fe-based superconductor Fe0.98Te0.5Se0.5. Together with our previous paper on the Cu-doping effects [PRB 88, 144509 (2013)], we provide a complete picture on the 3d transition metal substitution effects in the Fe-based superconductors---that is, the impact is more depe ndent on the scattering potential of the substituent, and in the extreme case such as Cu, the main effect of the substitution is to localize the itinerant electrons. This conclusion also seems to be applicable to other Fe-based superconductor systems, such as 122 and 111. Jinghui has been the leading author of the paper. This is his first paper. Congratulations on him!

2014-12-24

Congratulations on Jinghui and Kejing for their scholarships!

 

Jinghui Wang and Kejing Ran have been awarded the "Excellent New Graduate Student Scholarship". Congratulations on them!

2014-10-25

PPMS installed and running

 

The physical property measurement system (PPMS) was installed at our lab and is currently running. It is using a closed-cycle system with a compressor that converts Helium gas into liquid He, and thus no liquid He supply is needed at all. The system is equipped with the options to measure the magnetization (VSM), electrical transport (ETO), thermal power and conductivity (TTO), and specific heat (HCO).

2014-03-30

Experiments in France and US

 

From Feburary 10th to 24th, Shichao conducted his first neutron scattering experiment at Laboratory of Leon Brillouin (LLB), CEA, a reactor-type neutron source at Saclay near Paris. He worked on two triple-axis spectrometers 1T and 2T.

 

During March 12th to 21st, Yuan and Jinghui performed their first neutron scattering experiment on a triple-axis spectrometer HB1 at the High Flux Isotope Reactor (HFIR) of Oak Ridge National Lab.

2013-12-12

China Neutron Scattering Conference

 

Prof. Wen and Shichao attended the First China Neutron Scattering Conference in Dongguan, Guangdong, where the China Spallation Neutron Source (CSNS) is being built. Prof. Wen gave an invited talk advertising the group and presenting the research results. Shichao toured the construction site of the CSNS.