Effects of hydrostatic pressure and uniaxial strain on spin-peierls transition in an organic radical magnet, BBDTA · InCl4

Masaki Mito, Seiichiro Kawagoe, Hiroyuki Deguchi, Seishi Takagi, Wataru Fujita, Kunio Awaga, Ryusuke Kondo, Seiichi Kagoshima

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

We investigated the effects of hydrostatic pressure and uniaxial strain on the spin-Peierls (SP) transition of an organic radical magnet, benzo[1,2-d:4,5-d′]bis[1,3,2]dithiazole(BBDTA) · InCl4. It has a one-dimensional coordination polymer structure along its c-axis and its SP transition occurs at 108 K. The SP transition temperature TSP decreased to 99 K at a hydrostatic pressure of 10kbar, while it increased to 132K at a uniaxial strain along the c-axis of 8kbar. The pressure dependences of TSP under these two conditions were discussed by evaluating two parameters, namely, the intrachain interaction 2J/kB and the effective spin-lattice coupling parameter η, that are related to T SP by the equation TSP = 1.6ηJ/kB Under ambient pressure, the a-and c-axes of this material shortened monotonically with decreasing temperature, while the b-axis elongated below TSP In this study, we found the correlation between η and the change in the lattice constant b. 2J/kB increased with increasing hydrostatic pressure and uniaxial strain, suggesting that the contraction along the c-axis does not depend on the manner of pressurization. From the evaluation of η, the observed variation in TSP is explained by the difference between the changes in b under the two pressurization conditions.

Original languageEnglish
Article number124705
Journaljournal of the physical society of japan
Volume78
Issue number12
DOIs
Publication statusPublished - Dec 1 2009
Externally publishedYes

Keywords

  • Hydrostatic pressure
  • Organic radical magnet
  • Spin-peierls transition
  • Uniaxial strain

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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