Pressure induced effects on the chemical and magnetic structure of spinel MnV2O4. (31st July 2017)

• Record Type: Journal Article
• Authors: Singh, Ripandeep; Hansen, T; Ritter, C; Sharma, Neetika; Shahi, P; Chatterjee, S; Das, A
• Is Part Of: Journal of physics. Volume 29:Number 34(2017)
• Publication Date: 2017-07-31
• Subjects: pressure -- ferrimagnetism -- neutron diffraction; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/aa7c3e
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: The influence of external pressure ( P ⩽ 5 GPa) on both the structural and magnetic ordering in MnV2 O4 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), d T N /d P > 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, T N M n ~ 80 K, and T N V ~ 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.