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Pressure induced effects on the chemical and magnetic structure of spinel MnV2O4
- Source :
- Journal of Physics: Condensed Matter. 29:345802
- Publication Year :
- 2017
- Publisher :
- IOP Publishing, 2017.
-
Abstract
- The influence of external pressure (P ⩽ 5 GPa) on both the structural and magnetic ordering in MnV2O4 has been investigated using neutron diffraction technique. The volume and the V-V distance decrease with pressure while the c/a ratio increases, suggesting a lowering of the distortion with pressure. Under ambient conditions this compound exhibits a structural transition (T S) from tetragonal to cubic at ~53 K and a magnetic transition (T N ) at ~56 K. It is found that with an increase in pressure to 5 GPa, T N increases (from 56 K to 80 K), dT N /dP > 0, while T S decreases (from 53 K to 37 K). The non collinear magnetic structure in the tetragonal phase at 5 GPa and 10 K remains the same as at ambient pressure. However, the Mn and V sublattice, now exhibits distinct transition temperatures, [Formula: see text] ~ 80 K, and [Formula: see text] ~ 60 K. The transition to the cubic phase at T S is accompanied by a collinear alignment of the Mn and V spins and a reduction in the Mn moment. The region in which the structure remains in the cubic phase with collinear magnetic structure increases with pressure from ~3 K at ambient pressure to ~43 K at 5 GPa pressure.
- Subjects :
- Materials science
Condensed matter physics
Magnetic structure
Spins
Spinel
Neutron diffraction
02 engineering and technology
engineering.material
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Tetragonal crystal system
Volume (thermodynamics)
Phase (matter)
0103 physical sciences
engineering
General Materials Science
010306 general physics
0210 nano-technology
Ambient pressure
Subjects
Details
- ISSN :
- 1361648X and 09538984
- Volume :
- 29
- Database :
- OpenAIRE
- Journal :
- Journal of Physics: Condensed Matter
- Accession number :
- edsair.doi...........e6578210d9cabe4d457481ee036abac7