Effect of pressure on single-chain magnets with repeating units of the MnIIINiIIMnIII trimer

Masaki Mito, Hiroyuki Deguchi, Takayuki Tajiri, Seishi Takagi, Masahiro Yamashita, and Hitoshi Miyasaka
Phys. Rev. B 72, 144421 – Published 24 October 2005

Abstract

The single-chain magnet (SCM) system [Mn2(saltmen)2Ni(pao)2(L)2](A)2 (L: intrachain attaching ligand of NiII ion; A1: interchain counteranion) is a ferromagnetic one-dimensional network system with repeating units of the MnIIINiIIMnIII trimer which itself behaves as a single-molecule magnet with an S=3 spin ground state and negative uniaxial single-ion anisotropy (D) parallel to the bridging direction. The slow relaxation of the magnetic moment in this SCM system originates in an energy barrier for spin reversal (ΔE), which is closely related to the ferromagnetic interaction between the trimers (Jtrimer) as well as to the D of the trimer. We have investigated the effects of pressure on three compounds representative of the above SCM family through ac susceptibility measurements under hydrostatic pressures up to P=13.5kbar and crystal structural analysis experiments up to P=20.0kbar, and have observed a pronounced enlargement of ΔE when J was artificially increased. The application of hydrostatic pressure brought about the systematic enhancement of ΔE (a maximum increase of 10% within the pressure region of the experiments). The pressure dependence of ΔE varied according to the kind of attaching ligand L involved and the intrachain structure, and we have experimentally found that isotropic lattice shrinkage is desirable if a continuous increase of ΔE in this system is aimed at.

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  • Received 21 June 2005

DOI:https://doi.org/10.1103/PhysRevB.72.144421

©2005 American Physical Society

Authors & Affiliations

Masaki Mito1,2,*, Hiroyuki Deguchi1,2, Takayuki Tajiri1, Seishi Takagi1, Masahiro Yamashita2,3, and Hitoshi Miyasaka2,4,5

  • 1Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
  • 2CREST, Japan Science and Technology Agency (JST), Saitama 332-0012, Japan
  • 3Department of Chemistry, Tohoku University, Sendai 980-8578, Japan
  • 4Department of Chemistry, Tokyo Metropolitan University, Tokyo 192-0397, Japan
  • 5PRESTO, Japan Science and Technology Agency (JST), Saitama 332-0012, Japan

  • *Email address: mitoh@elcs.kyutech.ac.jp

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Issue

Vol. 72, Iss. 14 — 1 October 2005

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