Pressure-Induced Enhanced Magnetic Anisotropy in Mn(N(CN)2)2

Journal Article · Thu Jan 01 00:00:00 EST 2015 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.91.014439· OSTI ID:1185802

Quintero, P. A. ^[1]; Rajan, D. ^[1]; Peprah, M. K. ^[1]; Brinzari, T. V. ^[1]; Fishman, Randy Scott ^[2]; Talham, Daniel R. ^[1]; Meisel, Mark W. ^[1]

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1. University of Florida, Gainesville
2. ORNL

Using DC and AC magnetometry, the pressure dependence of the magnetization of the threedimensional antiferromagnetic coordination polymer Mn(N(CN)2)2 was studied up to 12 kbar and down to 8 K. The magnetic transition temperature, Tc, increases dramatically with applied pressure (P), where a change from Tc(P = ambient) = 16:0 K to Tc(P = 12:1 kbar) = 23:5 K was observed. In addition, a marked difference in the magnetic behavior is observed above and below 7.1 kbar. Specifically, for P < 7:1 kbar, the differences between the field-cooled and zero-field-cooled (fc-zfc) magnetizations, the coercive field, and the remanent magnetization decrease with increasing pressure. However, for P > 7:1 kbar, the behavior is inverted. Additionally, for P > 8:6 kbar, minor hysteresis loops are observed. All of these effects are evidence of the increase of the superexchange interaction and the appearance of an enhanced exchange anisotropy with applied pressure.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1185802
• Journal Information: Physical Review B, Vol. 91, Issue 1; ISSN 1098--0121
• Country of Publication: United States
• Language: English