Evolution of the magnetic phase transition in MnO confined to channel type matrices. Neutron diffraction study

Details Evolution of the magnetic phase transition in MnO confined to channel type matrices. Neutron diffraction study Evolution of the magnetic phase transition in MnO confined to channel type matrices. Neutron diffraction study

2005-03-03

arxiv.org/abs/cond-mat/0503075v3

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages pdf file, including 4 figures, uses revtex4.cls

Scientific paper

10.1103/PhysRevB.72.144409

Neutron diffraction studies of antiferromagnetic MnO confined to MCM-41 type matrices with channel diameters 24-87 A demonstrate a continuous magnetic phase transition in contrast to a discontinuous first order transition in the bulk. The character of the magnetic transition transforms with decreasing channel diameter, showing the decreasing critical exponent and transition temperature, however the latter turns out to be above the N\'eel temperature for the bulk. This enhancement is explained within the framework of Landau theory taking into consideration the ternary interaction of the magnetic and associated structural order parameters.

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