Qingyong Ren

9 Questions 16 Answers 0 Followers

Questions related from Qingyong Ren

What is the difference between coherent, incoherent, elastic and inelastic neutron scattering; diffuse scattering?

I have read a lot of references about neutron scattering. But I am still confused by these phrases: coherent elastic scattering, incoherent elastic scattering, coherent inelastic scattering and...

26 July 2017 4,942 9 View

How to index magnetic peaks in neutron diffraction patterns?

For the refinement of a magnetic structure using FullProf, we can use different model to describe the magnetic structure, such as irreducible representation using 'BasIreps' and magnetic space...

19 April 2017 7,825 4 View

Correlation between spin wave, spin density wave, spin excitation, spin fluctuation, spin gap, charge density wave and charge order?

I am currently reading some papers in the field of high Tc superconductivity. Some concepts confuse me. Can you tell me the definitions of spin wave, spin density wave, spin excitation, spin...

15 April 2017 352 8 View

Spiral magnetic structure in transition metal alloys & RKKY, D-M, Itinerant and direct interactions?

A transition from ferromagnetic structure to flat spiral structure was observed in a groups of transition metal alloys. The space group is Pnma and the magnetic Mn atoms occupy 4c position. How to...

21 July 2016 7,372 1 View

How to insert peak in propagation vector search using k-search?

One example is about ferromagnetic spiral structure (Fig-b). Besides the satellite peaks (hkl)+(Kx,Ky,Kz), the magnetic scattering also contributes on some (hkl) peaks. The propagation vector for...

12 July 2016 8,105 2 View

How to create a spiral magnetic structure using irreducible representation analysis?

For ThCr2Si2 structure (space group I4/mmm) sample, e.g. CeMn2Ge2, Mn atoms occupy the 4d site - site position (0, 0.5, 0.25). It was said that this sample has a ferromagnetic spiral structure...

12 July 2016 2,284 7 View

Does a magnetic structure model must agree with the irreducible representation theory?

For ThCr2Si2 structure (space group I4/mmm) sample, e.g. CaCo2As2, Co atoms occupy the 4d site - site position (0, 0.5, 0.25). Assume that the propagation vector as (0,0,0) and that a...

12 July 2016 5,130 1 View

How can I determine the nearest neighbor in a crystal?

How to use Wigner-Seitz cell to calculate the nearest neighbor in a given crystal? What is the physical principal? And which (free) software can be used to do this calculation?

17 August 2015 4,219 4 View

Can anyone help with K-vector search for a magnetic structure?

I have carried some neutron diffraction experiments. It is easy to analyse the pattern for samples with ferromagnetic and commensurate antiferromagnetic structures. But now I am not sure how to...

17 August 2015 1,198 5 View