12 Questions 20 Answers 0 Followers
Questions related from Qingyong Ren
The absorption correction coefficient, muR, has a large impact on the Rietveld refinements. In some software, this parameter could be refined. However, the FullProf program need to input a value...
20 September 2024 7,743 2 View
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 4,972 9 View
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 7,870 4 View
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 413 8 View
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 7,434 1 View
The unit cell of a magnetic structure is determined by the propagation vector. In my opinion, a propagation vector of (001) should give the same result of (000). But I find some reports mentioned...
18 July 2016 4,720 4 View
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 8,133 2 View
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 2,318 7 View
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 5,168 1 View
12 July 2016 4,101 5 View
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 4,264 4 View
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 1,223 5 View
