116 citations · 975 across the 31 of their papers we have counts for
31 papers
Topological nature of the Kondo insulator SmB and its sensitiveness to Sm vacancy
W. K. Park, J. A. Sittler, L. H. Greene +5
The true topological nature of the Kondo insulator SmB remains to be unveiled. Our previous tunneling study not only found evidence for the existence of surface Dirac fermions,…
Bulk transport paths through defects in floating zone and Al flux grown SmB
Yun Suk Eo, Alexa Rakoski, Shriya Sinha +16
We investigate the roles of disorder on low-temperature transport in SmB crystals grown by both the Al flux and floating zone methods. We used the inverted resistance method wi…
Monopolar and dipolar relaxation in spin ice HoTiO
Yishu Wang, T. Reeder, Y. Karaki +9
When degenerate states are separated by large energy barriers, the approach to thermal equilibrium can be slow enough that physical properties are defined by the thermalization pro…
Duality and domain wall dynamics in a twisted Kitaev chain
C. M. Morris, Nisheeta Desai, J. Viirok +9
The Ising chain in transverse field is a paradigmatic model for a host of physical phenomena, including spontaneous symmetry breaking, topological defects, quantum criticality, and…
Low Energy Magneto-optics of TbTiO in [111] Magnetic Field
Xinshu Zhang, Yi Luo, T. Halloran +4
The pyrochlore magnet TbTiO shows a lack of magnetic order to low temperatures and is considered to be a quantum spin liquid candidate. We perform time-domain THz…
Orientation Dependence of the Magnetic Phase Diagram of YbTiO
S. Säubert, A. Scheie, C. Duvinage +8
In the quest to realize a quantum spin liquid (QSL), magnetic long-range order is hardly welcome. Yet it can offer deep insights into a complex world of strong correlations and flu…
Multiphase Magnetism in Yb2Ti2O7
A. Scheie, J. Kindervater, S. Zhang +7
We document the coexistence of ferro- and anti-ferromagnetism in pyrochlore using three neutron scattering techniques on stoichiometric crystals: elastic neutron…
Enhanced thermal Hall conductivity below 1 Kelvin in the pyrochlore magnet YbTiO
Max Hirschberger, Peter Czajka, S. M. Koohpayeh +2
In this letter, we report the gigantic thermal Hall effect in the low-field correlated-paramagnetic state of the frustrated pyrochlore YbTiO. We observed a rec…
Superdislocations and point defects in pyrochlore Yb2Ti2O7 single crystals and implication on magnetic ground states
Zahra Shafieizadeh, Yan Xin, Seyed M. Koohpayeh +2
This study reports atomic-scale characterization of structural defects in Yb2Ti2O7, a pyrochlore oxide whose subtle magnetic interactions is prone to small perturbations. Due to di…
The pyrochlore Ho2Ti2O7: Synthesis, crystal growth and stoichiometry
Alireza Ghasemi, Allen Scheie, Jonas Kindervater +1
We have investigated the effect of synthesis and growth conditions on the magnetic, structural, and compositional properties of pyrochlore oxide holmium titanate and demonstrate a…
Diamagnetic Sm in the topological Kondo insulator SmB
W. T. Fuhrman, J. C. Leiner, J. W. Freeland +5
Samarium hexaboride is a topological Kondo insulator, with metallic surface states manifesting from its insulating band structure. Since the insulating bulk itself is driven by str…
Lattice-Mediated Magnetic Order Melting in TbMnO3
Edoardo Baldini, Teresa Kubacka, Benjamin P. P. Mallett +6
Recent ultrafast magnetic-sensitive measurements [Phys. Rev. B 92, 184429 (2015) and Phys. Rev. B 96, 184414 (2017)] have revealed a delayed melting of the long-range cycloid spin-…
An effect of Sm vacancies on the hybridization gap in topological Kondo insulator candidate SmB
Michael E. Valentine, Seyed Koohpayeh, W. Adam Phelan +4
A necessary element for the predicted topological state in Kondo insulator SmB is the hybridization gap which opens in this compound at low temperatures. In this work, we prese…
Impurities or a neutral Fermi surface? A further examination of the low-energy ac optical conductivity of SmB
N. J. Laurita, C. M. Morris, S. M. Koohpayeh +3
Recent experiments have uncovered evidence of low energy excitations in the bulk of SmB that are perhaps associated with unconventional quasiparticles, bringing into question w…
Field-dependent heat transport in the Kondo insulator SmB6 : phonons scattered by magnetic impurities
M-E. Boulanger, F. Laliberté, M. Dion +12
The thermal conductivity of the Kondo insulator SmB was measured at low temperature, down to 70 mK, in magnetic fields up to 15 T, on single crystals grown using both the f…
Dynamic pathway of the photoinduced phase transition of TbMnO
Elisabeth Bothschafter, Elsa Abreu, Laurenz Rettig +16
We investigate the demagnetization dynamics of the cycloidal and sinusoidal phases of multiferroic TbMnO by means of time-resolved resonant soft x-ray diffraction following exc…
Reentrant Phase Diagram of in Magnetic Field
A. Scheie, J. Kindervater, S. Säubert +9
We present a magnetic phase diagram of rare-earth pyrochlore in a magnetic field. Using heat capacity, magnetization, and neutron scatterin…
Impact of Stoichiometry of Yb2Ti2O7 on its Physical Properties
K. E. Arpino, B. A. Trump, A. O. Scheie +2
A series of Yb2Ti2O7 doped samples demonstrates the effects of off-stoichiometry on Yb2Ti2O7's structure, properties, and magnetic ground state via x-ray diffraction, specific heat…
Growth and Characterization of Iron Scandium Sulfide (FeSc2S4)
Jennifer R. Morey, Kemp W. Plumb, Chris M. Pasco +2
Here we report successful growth of mm scale single crystals of stoichiometric FeSc2S4. Single crystal X-ray diffraction yields a cubic structure, spacegroup Fd-3m, with a=10.5097(…
Disordered Route to the Coulomb Quantum Spin Liquid: Random Transverse Fields on Spin Ice in PrZrO
J. -J. Wen, S. M. Koohpayeh, K. A. Ross +8
Inelastic neutron scattering reveals a broad continuum of excitations in PrZrO, the temperature and magnetic field dependence of which indicate a continuous distributio…
Single crystal growth by the traveling solvent technique: A review
S. M. Koohpayeh
A description is given of the traveling solvent technique, which has been used for the crystal growth of both congruently and incongruently melting materials of many classes of int…
Breakdown of the Kondo insulating state in SmB6 by introducing Sm vacancies
Michael E. Valentine, Seyed Koohpayeh, W. Adam Phelan +4
SmB6 is a proposed topological Kondo insulator where the presence of topological nontriviality can be tuned by variations in the Sm valence. Experimentally, Sm valence can be chang…
On the Chemistry and Physical Properties of Flux and Floating Zone Grown SmB6 Single Crystals
W. A. Phelan, S. M. Koohpayeh, P. Cottingham +8
Recent theoretical and experimental findings suggest that the long-known but not well understood low temperature resistance plateau of SmB6 may originate from protected surface sta…
Ultrafast Laser-Induced Melting of Long-Range Magnetic Order in Multiferroic TbMnO3
Jeremy A. Johnson, T. Kubacka, M. C. Hoffmann +25
We performed ultrafast time-resolved near-infrared pump, resonant soft X-ray diffraction probe measurements to investigate the coupling between the photoexcited electronic system a…