Rich magnetic phase diagram in the Kagome-staircase compound Mn3V2O8

Details Rich magnetic phase diagram in the Kagome-staircase compound Mn3V2O8 Rich magnetic phase diagram in the Kagome-staircase compound Mn3V2O8

2007-04-12

arxiv.org/abs/0704.1581v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

Mn3V2O8 is a magnetic system in which S = 5/2 Mn2+ is found in the kagome staircase lattice. Here we report the magnetic phase diagram for temperatures above 2 K and applied magnetic fields below 9 T, characterized by measurements of the magnetization and specific heat with field along the three unique lattice directions. At low applied magnetic fields, the system first orders magnetically below Tm1 ~ 21 K, and then shows a second magnetic phase transition at Tm2 ~ 15 K. In addition, a phase transition that is apparent in specific heat but not seen in magnetization is found for all three applied field orientations, converging towards Tm2 as H -> 0. The magnetic behavior is highly anisotropic, with critical fields for magnetic phase boundaries much higher when the field is applied perpendicular to the Kagome staircase plane than when applied in-plane. The field-temperature (H - T) phase diagrams are quite rich, with 7 distinct phases observed.

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