TY - JOUR
T1 - Pressure-induced crossover from alternating to uniform interaction in a S = 1/2 one-dimensional Heisenberg antiferromagnet
AU - Mito, M.
AU - Kawae, T.
AU - Hosokoshi, Y.
AU - Inoue, K.
AU - Kinoshita, M.
AU - Takeda, K.
PY - 1999/8/17
Y1 - 1999/8/17
N2 - 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.
AB - 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.
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U2 - 10.1016/S0038-1098(99)00260-4
DO - 10.1016/S0038-1098(99)00260-4
M3 - Article
AN - SCOPUS:0032673424
SN - 0038-1098
VL - 111
SP - 607
EP - 611
JO - Solid State Communications
JF - Solid State Communications
IS - 11
ER -