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Questions related from Qiang Zhang
I need to add constraint on moment to fit data in FullProf. I set NMAGC to 1 and added constraints as followings. ! Nsym Cen N_Clat N_Ant NMAGC 4 0 0 0 1 ! ! Soft moment...
10 January 2025 675 1 View
For some materials, the global crystal structure is unchanged but there is a local symmetry breaking. Could anybody advise what is the effect of such local symmetry breaking on the electronic band...
20 November 2021 5,636 2 View
In the "1111" and "122" families of Fe-based pnictides, short-range stripe order was observed above TN. Does such short-range stripe order break the spin rotational symmetry? I only know that...
26 February 2017 8,640 1 View
The ferromagnetic order can break the time reversal symmetry. My question is: can any ferromagnetic order break the time reversal symmetry? For compounds who exhibit two types of ferromagnetic...
27 August 2016 9,079 4 View
As we are aware that there is optical mode in the phonon. Is there optical mode in the spin waves? Can spins make out-of-phase movements to lead to optical mode? If there is, how to understand...
22 December 2015 964 5 View
There is one interesting phenomena in Mn-based pnictides. In PrMnSbO, there is a tetragonal-orthohombic structural transition at 35 K. It is not driven by the transition-metal magnetism as in...
03 December 2015 6,516 3 View
I have refined magnetic structures using Fullprof. I can also plot the 3D magnetic structure using FPStudio. But the figure does not look beautiful. I want to use Vesta to plot more beautiful...
15 November 2015 4,083 1 View
I want to use FP studio 2.0 to show the bonds of the 3D structure. I can show Nd-O and Mn-Mn bonds, but I cannot show Mn-As bond (attached). It is very wired that the information of the...
16 September 2014 9,866 1 View
I am refining the magnetic structures and moments on NdMnAsO powder. I met a weird situation: Based on the symmetry analysis, Nd and Mn have the overlapped symmetry Gama10 (AFM...
11 August 2014 526 2 View
The B factors of each element in my refinement are around 26.5. But the overall B factor is -22.8. Is it possible that the overall B factor is negative? But my refinement looks very good and Rwp...
04 August 2014 5,814 17 View
As known, the spin wave damping usually increases with the increase of the temperature due to the thermal effect. I observed a rapid increase in the spin wave damping when the low-T non collinear...
25 March 2014 283 1 View
In the constant-Q energy scan of the inelastic neutron measurements (INS), there is one peak when energy gap emerges. What is the physical meaning of such peak width? In a few systems, I noticed...
23 March 2014 1,144 1 View
As known, the energy gap in the magnetic material emerges below one certain of temperature. In the literatures, some authors said energy gap is mainly induced by the orbital ordering/structural...
10 March 2014 8,692 21 View
It is well known that the spin wave spectrum in the antiferromagnetic ordering is commonly written as e=sqrt(A(q)^2-B(q)^2), based on the linear spin wave theory. The magnetic interactions are...
03 February 2014 3,515 0 View
As known, there is strip-like AFM ordering in pnictides RFeAsO or RFe2As2: Fe moments are parallel along a, but antiparallel along b in ab plane. But the orthorhombic structure is twin. In the...
03 October 2013 133 1 View
Could anyone explain the difference between spin correlation length and charge correlation length? Will spin correlation length show similar features to charge correlation length? For example, in...
08 December 2012 5,268 3 View
I want to generate the TOF-format pik file using WinPlotr-2006, which includes global profile parameters such as alpha0, alpha1, alpha2, alpha3, beta0,...beta3, Sig-2,...Sig-0, eta0,...eta 2....
01 January 1970 6,568 2 View
