Effects of Hydrostatic Pressure and Uniaxial Strain on Spin-Peierls Transition in an Organic Radical Magnet, BBDTA·InCl<SUB>4</SUB>

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Other Title
  • Effects of hydrostatic pressure and uniaxial strain on spin-Peierls transition in an organic radical magnet, BBDTA・InCl4
Published
2009
Resource Type
journal article
DOI
  • 10.1143/jpsj.78.124705
Publisher
THE PHYSICAL SOCIETY OF JAPAN

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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 10 kbar, while it increased to 132 K at a uniaxial strain along the c-axis of 8 kbar. 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 TSP 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.

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