A5102985166- Advanced Condensed Matter Physics
- Nuclear materials and radiation effects
- Transition Metal Oxide Nanomaterials
- Magnetic and transport properties of perovskites and related materials
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Luminescence Properties of Advanced Materials
- Thermal and Kinetic Analysis
- Geomagnetism and Paleomagnetism Studies
- Multiferroics and related materials
- Thermal Expansion and Ionic Conductivity
- Molecular Junctions and Nanostructures
- Surface and Thin Film Phenomena
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- X-ray Diffraction in Crystallography
- Glass properties and applications
- Physics of Superconductivity and Magnetism
- Gas Sensing Nanomaterials and Sensors
- Theoretical and Computational Physics
- Characterization and Applications of Magnetic Nanoparticles
- Surface Chemistry and Catalysis
Helmholtz-Zentrum Berlin für Materialien und Energie
2015-2019
McMaster University
2013-2015
Max Planck Institute for Physics
2008
Leipzig University
2007
The spin glass behavior of Y2Mo2O7 has puzzled physicists for nearly three decades. Free bulk disorder within the resolution powder diffraction methods, it is thought that this material a rare realization resulting from weak such as bond or local lattice distortions. Here, we report on single crystal growth Y2Mo2O7. Using neutron scattering, present unique isotropic magnetic diffuse scattering arising beneath transition despite having well-ordered structure at level. Despite our attempts to...
In this work we investigate the electrical transport properties and growth conditions of tungsten carbon (WC) palladium (PdC) nanostructures on Si substrates using a focused ion beam scanning electron microscope. situ energy dispersive x-ray (EDX) characterizations reveal that electron-beam-induced WC PdC nanostructure depositions (EBID) show lower metal concentration (below 3% atomic percentage) than in ion-beam-induced deposition (IBID) (above 20%). case pattern Pd/C content were optimized...
The geometrically frustrated double-perovskite Ba${}_{2}$YRuO${}_{6}$ has magnetic $4{d}^{3}$ Ru${}^{5+}$ ions decorating an undistorted face-centered-cubic lattice. This material been previously reported to exhibit commensurate long-range antiferromagnetic order below ${T}_{N}\ensuremath{\sim}$ 36 K, a factor $f\ensuremath{\sim}15$ times lower than its Curie-Weiss temperature ${\ensuremath{\Theta}}_{\text{CW}}=\ensuremath{-}522$ and purported short-range ${T}^{*}=47$ K. We report new...
Recent low temperature heat capacity (C$_P$) measurements on polycrystalline samples of the pyrochlore antiferromagnet Tb$_{2+x}$Ti$_{2-x}$O$_{7+\delta}$ have shown a strong sensitivity to precise Tb concentration $x$, with large anomaly exhibited for $x \sim 0.005$ at $T_C 0.5$ K and no such corresponding phase transition \le 0$. We grown single crystal Tb$_{2+x}$Ti$_{2-x}$O$_{7+\delta}$, approximate composition $x=-0.001, +0.0042$, $+0.0147$, where $x=0.0042$ exhibits C$_P$ $T_C$=0.45 K,...
Abstract A quantum spin liquid is a state of matter characterized by entanglement and the absence any broken symmetry. In condensed matter, frustrated rare-earth pyrochlore magnets Ho 2 Ti O 7 Dy , so-called ices, exhibit classical with fractionalized thermal excitations (magnetic monopoles). Evidence for ice, in which magnetic monopoles become long range entangled an emergent electrodynamics arises, seems within reach. The properties ice candidate Yb have eluded global understanding even...
A new (N 2 H 4 )WO 3 compound has been obtained by mixing WO and aqueous hydrazine solution at room temperature for 24 h. The reaction is catalyzed the presence of lithium. X-ray, synchrotron neutron diffraction techniques have shown that material crystallizes in trigonal space group P 21 (No. 154). Chains distorted tetrahedra extend along a axis unit cell, linked corner-sharing oxygen atom: N are voids between them. thermal characterization shows this stable up to 220°C, greatly beyond...
Over the last decades, thermoelectric (TE) oxides have gained increasing interest as potential materials for direct conversion of waste heat into electricity applications in mid-to high temperature range up to 1200°C.To overcome a major drawback -a typically low electrical conductivity -the use square planar structural motifs has recently been theoretically proposed based on an inverse band structure design approach [1] and, combination with stereo-chemically active lone-electron pairs heavy...