TY - JOUR
T1 - High-field magnetization of the S=1/2 two-leg spin-ladder antiferromagnets CuAX2 (A=Diazine, X=Halogen)
AU - Ikeda, M.
AU - Honda, Z.
AU - Sakai, M.
AU - Kimura, S.
AU - Okunishi, K.
AU - Hagiwara, M.
N1 - Funding Information:
Acknowledgements This work was partly supported by the Global COE Program (Core Research and Engineering of Advanced Materials-Interdisciplinary Education Center for Materials Science) (No. G10) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.
PY - 2013/3
Y1 - 2013/3
N2 - We have performed magnetic susceptibility and high-field magnetization measurements on powder samples of Cu(DEP)Br2 (DEP=2,3-diethyl- pyrazine) and Cu(DMP)Cl2 (DMP=2,3-dimethyl-pyrazine) which are regarded as spin-1/2 two-leg spin-ladders in which the exchange constants are given by J ∥ along the leg and J ⊥ along the rung. The temperature dependences of magnetic susceptibilities of these compounds show a round peak at 11 and 18 K, respectively, and are compared with those calculated with a density matrix renormalization group method for α=J ∥/J ⊥=0.45-0.55. The exchange constants of the former and the latter compounds are evaluated to be J/kB=16.5 K and J/kB=28.4K, respectively. No magnetization at 1.3 K appears in magnetic fields of up to about 5 T for Cu(DEP)Br 2 and about 14 T for Cu(DMP)Cl2, and then the magnetization increases monotonically to saturate at around 25 T and 38 T for respective compounds. Both magnetization curves are also compared with those calculated for α=0.45-0.55 using the same exchange parameter values as in the susceptibilities.
AB - We have performed magnetic susceptibility and high-field magnetization measurements on powder samples of Cu(DEP)Br2 (DEP=2,3-diethyl- pyrazine) and Cu(DMP)Cl2 (DMP=2,3-dimethyl-pyrazine) which are regarded as spin-1/2 two-leg spin-ladders in which the exchange constants are given by J ∥ along the leg and J ⊥ along the rung. The temperature dependences of magnetic susceptibilities of these compounds show a round peak at 11 and 18 K, respectively, and are compared with those calculated with a density matrix renormalization group method for α=J ∥/J ⊥=0.45-0.55. The exchange constants of the former and the latter compounds are evaluated to be J/kB=16.5 K and J/kB=28.4K, respectively. No magnetization at 1.3 K appears in magnetic fields of up to about 5 T for Cu(DEP)Br 2 and about 14 T for Cu(DMP)Cl2, and then the magnetization increases monotonically to saturate at around 25 T and 38 T for respective compounds. Both magnetization curves are also compared with those calculated for α=0.45-0.55 using the same exchange parameter values as in the susceptibilities.
KW - Magnetic susceptibility
KW - Magnetization
KW - Quantized spin models
KW - Two-leg spin-ladder
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U2 - 10.1007/s10909-012-0809-y
DO - 10.1007/s10909-012-0809-y
M3 - Article
AN - SCOPUS:84876280906
VL - 170
SP - 296
EP - 301
JO - Journal of Low Temperature Physics
JF - Journal of Low Temperature Physics
SN - 0022-2291
IS - 5-6
ER -