Magnetic relaxations arising from spin-phonon interactions in the nonthermally activated temperature range for a double-decker terbium phthalocyanine single molecule magnet

Takamitsu Fukuda, Natsuko Shigeyoshi, Tomoo Yamamura, Naoto Ishikawa

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

Magnetic relaxations arising from spin-phonon interactions for a magnetically diluted double-decker terbium phthalocyanine single molecule magnet, dil1, in the nonthermally activated temperature range have been investigated. While the relaxation time, τ, is independent of the external static magnetic field, Hdc, in the high temperature range, where linear relationships between -ln τ and T-1 are observed in the Arrhenius plot, magnetic field dependences for τ are observed in the lower temperature range. The τ-1 vs Hdc plot at 12 K fits the quadric curve when Hdc < 12 kOe, while linear relationships are observed in the τ-1 vs T plots in the temperature range of 12-20 K. These results indicate that the direct process is the dominant magnetic relaxation pathway in the nonthermally activated temperature range, while the contribution from the Raman process, if any, is not observable. We emphasize in this paper that the contribution from the thermal relaxation processes and the quantum tunneling of magnetizations (QTMs) to the experimentally observed magnetic relaxations must be evaluated carefully in order to avoid confusion between the thermal and quantum-mechanical relaxation pathways.

Original languageEnglish
Pages (from-to)9080-9086
Number of pages7
JournalInorganic chemistry
Volume53
Issue number17
DOIs
Publication statusPublished - 2014 Sep 2

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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