Long-range magnetic ordering of quasi-one-dimensional S=1/2 Heisenberg antiferromagnet Sr2Cu(PO4)(2)

摘要

Magnetic properties of quasi-one-dimensional S = 1/2 Heisenberg antiferromagnet Sr2Cu(PO4)(2) were investigated by temperature and field dependence of AC susceptibility down to 0.03 K. A sharp peak was observed at T-N = 0.085 K on the temperature dependence of AC susceptibility indicating long-range magnetic ordering. Taking into account the exchange constant, J/kB = 143 K (Hamiltonian = J Sigma SiSi+1), the ratio kappa(B)T(N)/J is 0.06 %. Sr2Cu(PO4)(2) is, therefore, one of the best one-dimensional Heisenberg antiferromagnet known so far. (c) 2005 Elsevier Inc. All rights reserved.