V51NMR study of the kagome staircase compoundNi3V2

Abstract

We used 51 V NMR to study magnetic ordering in the Ni 3 V 2 O 8 single crystal with a Kagome staircase structure of Ni atoms. The NMR spectra were measured in the temperature range T = ͑3 -300͒ K and magnetic fields H = ͑2 -9.4͒ T directed along the main a , b , c axes of the orthorhombic ͑Cmca͒ crystal. The local magnetic field at the 51 V NMR probe determines position and the shape of the corresponding NMR line. These parameters yield an unique information, respectively, on the uniform and the staggered spin components of the ordered Ni. The NMR data collected at H Ն 2 T are considered in line with predictions of the representation theory ͓A. Harris, Phys. Rev. B 76, 054447 ͑2007͔͒ with a result that incommensurate amplitude-modulated structure of the spine Ni s spins acquires in the high-temperature incommensurate ͑HTI͒ phase two prominent nearly equal spin components S a Ϸ S c ӷ S b instead of the longitudinal incommensurate spin-density wave ͑SDW͒ order with S a ӷ S c , S b as it was deduced from neutron-diffraction data ͓M. Kenzelmann et al., Phys. Rev. B 74, 014429 ͑2006͔͒. No noticeable variation of SDW polarization in the ab plane was detected below the HTI-low-temperature incommensurate ͑LTI͒ transition. In both the HTI and LTI phases two almost equal spin components of the Ni s spins S a Ϸ S c ӷ S b exist at H Ͻ 4.7 T. Their phasing is still not determined. The bulk magnetization in these phases is explained by contribution of the cross-tie Ni c spins which antiferromagnetic structure in the LTI phase is canted along H.

Magnetic properties of the itinerant A- type antiferromagnet CaCo2P2 studied by Co59 and Higa1, Ding2, Teruya3 et al. 2018Phys. Rev. B5000View full textAdd to dashboardCite

“…Those make NMR spectrum measurements difficult below ∼ 200 K. It is noted that the two peak structure observed at 225 K for H ab is due to the shorter T 2 of the central transition lines than the satellite lines, making the difference in the signal intensity between the experimental and the simulated results around the center of the spectra. Similar double peak structure has been observed in 51 V NMR spectra in the AFM compound YVO 3 39 and also in the kagome staircase compound Ni 40 . Figure 1(c) shows the T dependence of the 59 Co-NMR shift for H ab plane ( 59 K ab ) and H c axis ( 59 K c ) determined from the simulated spectra, where both 59 K ab and 59 K c decrease on lowering temperature.…”

High magnetic field induced phases and half-magnetization plateau in theS=1kagome compound Ni3V2Wang1, Tokunaga2, He3 et al. 2011Phys. Rev. B364280View full textAdd to dashboardCite

“…20 Nevertheless, recent works in the low-field regions resulted in controversies and would imply different types of magnetism in this system. 21,22 This has provided the motivation for using sufficiently high magnetic fields to reveal possible unique interactions or transitions. A successful example is that a different high-field state was revealed by a magneto-optical study up to 30 T for H b.…”

“…The magnetic kagome planes are separated by nonmagnetic VO 4 tetrahedra, while within the kagome planes the Ni 2+ ions interact with each other through Ni-O-O-Ni superexchange pathways. This compound is very attractive due to the anisotropic phase diagrams and complex magnetoelectric interactions 3,[19][20][21][22][23][24]. As…”

Applications of nuclear shielding

“…Ni 3 V 2 O 8 single crystal with a Kagome staircase structure of Ni atoms was studied by 51 V NMR measurements in the temperature range T = 3-300 K and magnetic fields 2-9.4 T. directed along the main a, b, c axes of the orthorhombic (C mca ) crystal. 94 The electric quadrupole tensors at the Li sites were detected and the temperature dependence of the 51 V Knight shift and the 51 V nuclear spin-lattice relaxation rate, indicating the presence of the charge disproportionation were discussed. Determination of the 51 V NMR anisotropic magnetic shielding parameters for powder {V(O)(ONMe 2 ) 2 } 2 O containing half-integer spin quadrupolar nuclei was achieved by analysis of the difference spectrum obtained with and without application of a hyperbolic secant pulse.…”