Investigation of the magnetic structure of the one dimensional spin-1 chain: PbCd2Ni6Te3O18

Recently the one dimensional spin chain have attracted considerable interest in condensed matter. The antiferromagnetic Heisenberg spin chain with integer spin has a short-range magnetic order and an excitation energy gap, so-called Haldane gap. Recently, PbCd2Ni6Te3O18 has been reported having 1D spin chain of Ni2+ ions (S=1) along the c-axis in its hexagonal crystal structure. PbCd2Ni6Te3O18 exhibits a long range magnetic ordering at TN=25.7 K confirmed through the susceptibility and heat capacity. The susceptibility above TN exhibits a broad maximum at 40 K indicating a development of a short range correlations. As there are no reports on the magnetic structure of this compound, here we proposed to investigate its magnetic structure and short range magnetic correlations using WISH. We will prepare the sample using 114Cd isotope to reduce neutron absorption.

近年来，一维自旋链在凝聚态物理领域引起了广泛关注。整数自旋的反铁磁海森堡自旋链具有短程磁有序和激发能隙，即所谓的霍尔丹能隙（Haldane gap）。近期有研究报道，PbCd2Ni6Te3O18在其六方晶体结构中沿c轴存在Ni²+离子（S=1）构成的一维自旋链。通过磁化率和热容测量证实，PbCd2Ni6Te3O18在TN=25.7 K时呈现长程磁有序。TN以上温度的磁化率在40 K处出现宽峰，表明短程关联的形成。由于目前尚无该化合物磁结构的相关报道，本研究拟利用WISH研究其磁结构及短程磁关联。我们将采用¹¹⁴Cd同位素制备样品，以降低中子吸收。