A5090298018- Magnetism in coordination complexes
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Lanthanide and Transition Metal Complexes
- Rare-earth and actinide compounds
- Magnetic Properties of Alloys
- Magnetic properties of thin films
- Electron Spin Resonance Studies
- Advanced NMR Techniques and Applications
- Organic and Molecular Conductors Research
- Multiferroics and related materials
- Nuclear Physics and Applications
- Magnetic Properties and Applications
- Theoretical and Computational Physics
- Polyoxometalates: Synthesis and Applications
- Shape Memory Alloy Transformations
- Solid-state spectroscopy and crystallography
- Superconducting Materials and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- High-pressure geophysics and materials
- Atomic and Subatomic Physics Research
- Iron-based superconductors research
Tohoku University
2016-2025
Oak Ridge National Laboratory
2022
University of California, Riverside
2022
Arizona State University
2022
Toyama College
2021
National Institute of Technology, Toyama College
2021
Sendai University
2015-2020
Indian Institute of Technology Bombay
2019
Universidad de Zaragoza
2019
Bielefeld University
2019
Lanthanide ions are supposed to be promising candidates for the elements of single-molecule magnets (SMMs) because large magnetic momentum and anisotropy. We have established [Dy2Cu] complex as a new SMM. A plausible mechanism quantum tunneling magnetization is proposed first time among 4f−3d heterometallic SMMs. The coupling parameter between Dy Cu was well-defined −0.155 K.
Charge density wave (CDW) correlations have recently been shown to universally exist in cuprate superconductors. However, their nature at high fields inferred from nuclear magnetic resonance is distinct that measured by x-ray scattering zero and low fields. Here we combine a pulsed magnet with an free electron laser characterize the CDW YBa2Cu3O6.67 via up 28 Tesla. While zero-field order, which develops below T ~ 150 K, essentially two-dimensional, lower temperature beyond 15 Tesla, another...
We have performed high-field magnetization and electronic spin resonance (ESR) measurements on Ba3CoSb2O9 single crystals, which approximates the two-dimensional (2D) S=1/2 triangular-lattice Heisenberg antiferromagnet. For an applied magnetic field H parallel to ab plane, entire curve including plateau at one-third of saturation (Ms) is in excellent agreement with results theoretical calculations except a small step anomaly near (3/5)Ms, indicative theoretically undiscovered quantum phase...
Last night of the POMs: The title compound (X=GeIV) exhibits slow relaxation magnetization and quantum tunneling with a single-molecule magnetic behavior. Significant structural differences in [MnIII4MnII2O4(H2O)4]8+ cluster core X=SiIV analogue modify properties, thereby illustrating how polyoxometalate (POM) ligands can help systematic construction nanoscale magnets.
A lightly doped manganite ${\mathrm{La}}_{0.88}{\mathrm{Sr}}_{0.12}{\mathrm{MnO}}_{3}$ exhibits a phase transition at ${T}_{\mathrm{OO}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}145\phantom{\rule{0ex}{0ex}}\mathrm{K}$ from ferromagnetic metal ( ${T}_{C}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}172\phantom{\rule{0ex}{0ex}}\mathrm{K}$) to novel insulator. We identify that the key parameter in is orbital degree of freedom ${e}_{g}$ electrons. By utilizing resonant x-ray...
The binuclear [FeIII(bpca)(mu-bpca)Dy(NO3)4], having Single Molecule Magnet (SMM) properties, belonging to a series of isostructural FeIIILnIII complexes (Ln = Eu, Gd, Tb, Dy, Ho) and closely related FeIILnIII chain structures, was characterized in concise experimental theoretical respects. low temperature magnetization data showed hysteresis tunneling. anomalous dependence Mössbauer spectra is the onset magnetic order, consistent with relaxation time scale resulting from AC susceptibility...
When human myeloid and monocytoid leukemic cell lines HL-60 U937, respectively, were treated with an exogenous sialoglycosphingolipid, ganglioside GM3, in serum-free medium, growth was markedly inhibited, their morphological maturation along a monocytic lineage observed. In addition to significant increase phagocytic nonspecific esterase activities, marked of monocyte-specific surface antigens detectable monoclonal antibodies such as OKM1 OKM5 observed GM3-fed cells. Other...
The state excited from the ground singlet of ${\mathrm{Co}}^{3+}$ in ${\mathrm{LaCoO}}_{3}$ was investigated by submillimeter-wave electron spin resonance (ESR) measurements. Clear ESR signals with zero-field splitting were observed above 20 K for first time. activation energy is estimated to be $\ensuremath{\Delta}\ensuremath{\approx}140\mathrm{K},$ temperature dependence signal intensity and resonance-width. frequency angular successfully analyzed an effective spin-Hamiltonian uniaxial...
A Mn(III)-salen-type complex with a diamagnetic [Co(III)(CN)6](3-) moiety, [Mn(III)(5-TMAM(R)-salmen)(H2O)Co(III)(CN)6]·7H2O·MeCN [1; 5-TMAM(R)-salmen = (R)-N,N'-(1-methylethylene)bis(5-trimethylammoniomethylsalicylideneiminate], was prepared. From direct-current magnetic susceptibilities, magnetization, and high-field multifrequency electronic spin resonance measurements on powdered samples, 1 has significant uniaxial anisotropy. Frequency-dependent alternating-current susceptibility...
Self-assembly of artificial nanoscale units into superstructures is a prevalent topic in science. In biomimicry, scientists attempt to develop self-assembled nanoarchitectures. However, despite extensive efforts, the preparation nanoarchitectures with superior physical properties remains challenge. For example, one major topics field molecular magnetism development high-spin (HS) molecules. Here, we report cyanide-bridged magnetic nanocage composed 18 HS iron(III) ions and 24 low-spin...
The existence of charge density wave (CDW) correlations in cuprate superconductors has now been established. However, the nature ground state order remained uncertain because disorder and presence superconductivity typically limit CDW correlation lengths to a dozen unit cells or less. Here we explore YBa2Cu3Ox (YBCO) ortho-II ortho-VIII crystals, which belong cleanest available family, at magnetic fields excess resistive upper critical field (Hc2) where is heavily suppressed. We find an...
The creation of a perfect hollow nanoscopic sphere metal centers is clearly an unrealizable synthetic challenge. It is, however, inspirational challenge from the viewpoint chemical architecture and also as finite molecular species may provide unique microscopic insight into origin onset phenomena such topological spin-frustration effects found in infinite 2D 3D systems. Herein, we report series high-symmetry gadolinium(III) (S = 7/2) polyhedra, Gd20, Gd32, Gd50, Gd60, to test approach based...
Abstract Exotic quantum vacuum phenomena are predicted in cavity electrodynamics systems with ultrastrong light-matter interactions. Their ground states to be squeezed suppressed fluctuations owing antiresonant terms the Hamiltonian. However, such predictions have not been realized because interactions typically negligible compared resonant systems. Here we report an unusual, ultrastrongly coupled matter-matter system of magnons that is analytically described by a unique Hamiltonian which...
PbTe crystals have a soft transverse optical phonon mode in the terahertz frequency range, which is known to efficiently decay into heat-carrying acoustic phonons, resulting anomalously low thermal conductivity. Here, we studied this via polarization-dependent spectroscopy. We observed softening of with decreasing temperature, indicative incipient ferroelectricity, explain through model including strong anharmonicity quartic displacement term. In magnetic fields up 25 T, splits two modes...
A N 6 -tripodal ligand allows the preparation of a family prismatic mononuclear cationic Co II complexes with SMM behavior. Their axial anisotropy, magnetic relaxation and hysteresis width are modulated by anion effects on crystal structure.
The recently demonstrated chiral modes of lattice motion carry angular momentum and therefore directly couple to magnetic fields. Notably, their moments are predicted be strongly influenced by electronic contributions. Here, we have studied the response transverse optical phonons in a set Pb 1− x Sn Te films, which is topological crystalline insulator for > 0.32 has ferroelectric transition at an -dependent critical temperature. Polarization-dependent terahertz magnetospectroscopy...
Insulin-dependent cell growth has been correlated with insulin receptor function, particularly receptor-associated kinase activity, in vitro studies. The insulin-dependent phosphorylation of the 95-kDa subunit was clearly inhibited, a concentration-dependent manner, by presence unbranched neolacto series gangliosides having NeuAc2----3Gal terminus, 2----3-sialosylparagloboside (2----3SPG; IV3NeuAc-nLc4), but not other NeuAc2----6Gal terminus or branched (e.g. G10). Such inhibition minimal...
A unique "single-chain quantum magnet" was formed by an alternating arrangement of high-spin FeII/low-spin FeIII ions. Although the predominant spin-carrier components (high-spin FeII) possess easy-plane magnetic anisotropy (D > 0), twisted easy-planes along chain axis defines a novel class one-dimensional Ising system.
Two novel Cu6 and Mn6 hexagon sandwiched polyoxometalates, [(CuCl)6(AsW9O33)2]12- (1a) [(MnCl)6(SbW9O33)2]12- (2a), have been synthesized characterized by X-ray single-crystal analysis magnetic measurements. These complexes are D3d symmetric were isolated as [n-BuNH3]+ salts from aqueous solutions: (n-BuNH3)12[(CuCl)6(AsW9O33)2].6H2O (1), rhombohedral, R, a = 20.33(1) A, c 26.35(2) Z 3 (n-BuNH3)12[(MnCl)6(SbW9O33)2].6H2O (2). Six Cu (or Mn) atoms, each of which shows 5-fold coordination,...
The tetranuclear complex [MnIII2NiII2Cl2(salpa)2] (salpa = N-(2-hydroxybenzyl)-3-amino-1-propanol) has a spin ground state of S 6 and was confirmed to be an SMM based on steplike feature the magnetization hysteresis loop at 0.55 K.
Two unique materials based on Mn4 single-molecule magnet (SMM) clusters (ST=9) and integer or non-integer average valent platinum maleonitriledithiolate (mnt2-) complexes, [{MnII2MnIII2(hmp)6(MeCN)2}{Pt(mnt)2}2][Pt(mnt)2]2.2MeCN (1) [{MnII2MnIII2(hmp)6(MeCN)2}{Pt(mnt)2}4][Pt(mnt)2]2 (2), were synthesized by the material diffusion method electrochemical oxidation, respectively (hmp-=2-hydroxymethylpyridinate). 1 2 are comprised of four six [Pt(mnt)2]n- units, respectively, in addition to a...