ABSTRACT
We have investigated the magnetic properties of a polycrystalline sample of NdOs2Al10using neutron diffraction and inelastic neutron scattering, magnetic susceptibility and heat capacity measurements. The magnetic susceptibility data reveal an antiferromagnetic transition atTN1= 2.2 K while the heat capacity data which extend to lower temperatures show a further transition atTN2= 1.1 K. The INS measurements detect four well-resolved crystal field excitations at 7.4, 12.4, 17.6 meV and 19.2 meV at 5 K. The positions and intensities of the observed CEF excitations and the temperature dependence of previously published single crystal susceptibility data are analysed based on the orthorhombic CEF model of theJ= 9/2 ground state multiplet of Nd3+ion. The neutron diffraction study reveals the magnetic structure atT= 1.6 K to be of sine wave type (κ= [0, 0.723, 0]) with an ordered state moment ofµNd3+= 1.59(1)µBaligned along thea-axis in agreement with the single ion crystal field anisotropy. This indicates that the magnetism of NdOs2Al10is governed by the RKKY interactions in agreement with otherRT2Al10(R= Nd, Sm, Tb,T= Fe, Ru and Os), but different to that ofR= Ce based compounds where anisotropic two ions interaction as well as Kondo interaction govern the anomalous direction of the ordered state moment.
Subject(s)
Adenosine Triphosphatases/blood , Antibodies, Antinuclear/blood , DNA-Binding Proteins/blood , Dermatomyositis/immunology , Adult , Aged , Arm/diagnostic imaging , Cohort Studies , Dermatomyositis/diagnostic imaging , Dermatomyositis/pathology , Female , Humans , Magnetic Resonance Imaging , Middle Aged , Retrospective Studies , Young AdultSubject(s)
Panniculitis/pathology , Rheumatic Fever/diagnosis , Acute Disease , Biopsy , C-Reactive Protein/analysis , Diagnosis, Differential , Humans , Male , Middle Aged , Panniculitis/etiology , Recurrence , Rheumatic Fever/complications , Streptococcal Infections/complications , Streptococcus pyogenesSubject(s)
Acrodermatitis/immunology , Dermis/pathology , Immunoglobulin G/immunology , Psoriasis/immunology , Acrodermatitis/blood , Acrodermatitis/pathology , Aged, 80 and over , Biopsy , Dermis/cytology , Dermis/immunology , Humans , Immunoglobulin G/blood , Immunoglobulin G/metabolism , Lymphocytes/immunology , Lymphocytes/metabolism , Male , Plasma Cells/metabolism , Plasma Cells/microbiology , Psoriasis/blood , Psoriasis/pathologyABSTRACT
We have been working on developing a low-cost tabletop NMR system. We reported that a field homogeneity as high as 50â¯ppm was achieved with a simple NMR magnet by employing two facing ferrite magnets with iron disks in between (Chonlathep et al., 2017). In this paper, we report two improvements added to our previous system: (1) an FPGA based signal processing unit to improve the S/N ratio and (2) a simple shimming mechanism to improve the field homogeneity. We obtained as high as 1â¯ppm field homogeneity in the best case. The signals from hydrogen nuclear spins in a methyl and carboxy group in acetic acid were resolved in NMR spectra.
