Magnetic ordering in the frustrated J(1)-J(2) Ising chain candidate BaNd2O4

Article

关键词: PYROCHLORE ANTIFERROMAGNET TB2TI2O7;    SPIN ICE;    DIFFRACTION;   

DOI  :  10.1103/PhysRevB.90.134403

来源: SCIE

【 摘 要 】

The AR(2)O(4) family (R = rare earth) has recently been attracting interest as a new series of frustrated magnets, with the magnetic R atoms forming zigzag chains running along the c axis. We have investigated polycrystalline BaNd2O4 with a combination of magnetization, heat-capacity, and neutron powder diffraction measurements. Magnetic Bragg peaks are observed below T-N = 1.7 K, and they can be indexed with a propagation vector of (k) over bar = (0,1/2,1/2). The signal from magnetic diffraction is well described by long-range ordering of only one of the two types of Nd zigzag chains, with collinear up-up-down-down intrachain spin configurations (double Neel state). Furthermore, low-temperature magnetization and heat-capacity measurements reveal two magnetic-field-induced spin transitions at 2.75 and 4 T for T = 0.46 K. The high-field phase is paramagnetic, while the intermediate-field state may arise from a spin transition of the long-range ordered Nd chains. One possible candidate for the field-induced ordered state corresponds to an up-up-down intrachain spin configuration, as predicted for a classical J(1)-J(2) Ising chain with a double Neel ground state in zero field.

【 授权许可】

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