We have confirmed the pressure-induced crossover from the alternating to the uniform interaction in a one-dimensional (1D) organic antiferromagnet by the measurement of heat capacity. The pentafluorophenyl nitroxide radical (F5PNN), which is a S = 1/2 1D Heisenberg antiferromagnet with the alternating interaction ratio α = |J2/J1|≈0.4(J1/kB = -3.1 K) at ambient pressure, has transformed into the uniform one (α = 1; J1/kB = -4.5 K) under the pressure of 6.5 kbar. This pressure-induced crossover was made clear by observing the change of low-temperature gradient of heat capacity, which gradually transformed from exponential to linear dependence on temperature, by the pressurization.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Materials Chemistry