Magnetic ordering in the frustratedJ1−J2Ising chain candidateBaNd2O4

Abstract

The AR2O4 family (R = rare earth) have 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 (NPD) measurements. Magnetic Bragg peaks are observed below TN = 1.7 K, and they can be indexed with a propagation vector of k = (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 Néel state). Furthermore, low temperature magnetization and heat capacity measurements reveal two magnetic field-induced spin transitions at 2.75 T 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 J1-J2 Ising chain with a Double Néel ground state in zero field.

Magnetic and spectral properties of the multisublattice oxidesSrY2O4:Er3+andМалкин1, Nikitin2, Mumdzhi3 et al. 2015Phys. Rev. B341350View full textAdd to dashboardCite

“…It is rather important to be able to separate the single-ion effects from the collective interactions for the overall understanding of the complex low-temperature magnetic properties of the concentrated strontium rare earth oxides SrR 2 O 4 (as well as the related family of barium rare earth oxides [33][34][35]). We hope that the approach adopted in this paper and that has proven successful for SrEr 2 …”

Phase-separated magnetic ground state in Mn3Ga0.45Sn0.55C

“…Among the existing geometrically frustrated 3d transition metal based antiperovskite compounds displaying a fascinating array of properties ranging from giant magnetoresistance 21,22 to a large magnetocaloric effect (MCE) [23][24][25] 1 exhibits a transition from an enhanced paramagnetic state to an AFM state at ∼155…”

Magnetic structure ofYb2Pt2Pb: Ising moments on the Shastry-Sutherland lattice

“…The Ising nature of the ground state is protected by its minimal overlap with the wave functions of the energetically remote excited states. The energy of the first excited state |E ± 1 25 meV sets the scale for rotating the Yb moments away from the (110) and (−110) directions in the SSL plane, and so at low temperatures no moment canting is permitted and no spiral-type modulated structure of the Yb moments is possible [29][30][31][32]. Although the Yb1 and Yb2 sites have slightly different chemical environments, the Yb-Pt and Yb-Pb distances differ only slightly, and the variation in the associated CEF splitting of the ground manifold on the two sites is small compared to |E ± 1 .…”