Pressure effects on Mn4 single-molecule magnet with two-dimensional correlation

M. Ogawa, M. Mito, T. Tajiri, H. Deguchi, S. Takagi, K. Nakata, M. Yamashita, H. Miyasaka

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We have investigated the magnetic properties of two-dimensional networked single-molecule magnet, [Mn4(hmp)4Br2(OMe)2(dcn)2]·0.5H2O·2THF (Hmp=2-hydroxymethylpyridine, dcn=dicyanamide, THF=tetrahydrofuran), through the AC susceptibility measurements up to P=15.3 kbar. This compound exhibits superparamagnetic relaxation phenomenon below 3 K, and the blocking temperature (TB) in low frequency limit is estimated to be 2.00 K at ambient pressure. As pressure increases, the TB once decreases and, at around P=3 kbar, it turns to increase. At P=15.3 kbar, the TB reaches 2.27 K. By analyzing the frequency dependence of TB, it has been revealed that a dynamical critical exponent of the power-law fitting shows the change of up and down, and it approaches 2.0 at last. This result suggests that the intercluster magnetic network changes by pressurization and finally a conventional phase transition may be realized.

Original languageEnglish
Pages (from-to)e489-e491
JournalJournal of Magnetism and Magnetic Materials
Volume310
Issue number2 SUPPL. PART 2
DOIs
Publication statusPublished - 2007 Mar 1

Keywords

  • Mn clusters
  • Pressure effects
  • Single-molecule magnet
  • Slow dynamics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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