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Role of stacking defects on the magnetic behavior of CrCl
John A. Schneeloch, Adam A. Aczel, Feng Ye +1
In the study of van der Waals-layered magnetic materials, the properties of CrCl continue to attract attention. This compound is reported to undergo antiferromagnetic (AFM) ord…
Observation of helimagnetism in the candidate ferroelectric CrI
John A. Schneeloch, Shunshun Liu, Prasanna V. Balachandran +2
CrI is a quasi-one dimensional (1D) van der Waals (vdW) system that exhibits helimagnetism that propagates along the ribbons. This was determined from neutron time-of-flight…
Antiferromagnetic-ferromagnetic homostructures with Dirac magnons in van der Waals magnet CrI
John A. Schneeloch, Luke Daemen, Despina Louca
Van der Waals (vdW) Dirac magnon system CrI, a potential host of topological edge magnons, orders ferromagnetically (FM) (T K) in the bulk, but antiferromagnetic (AFM) o…
Emergence of Layer Stacking Disorder in c-axis Confined MoTe
James L Hart, Lopa Bhatt, Yanbing Zhu +13
The layer stacking order in 2D materials strongly affects functional properties and holds promise for next generation electronic devices. In bulk, octahedral MoTe possesses two…
Large change of interlayer vibrational coupling with stacking in MoWTe
John A. Schneeloch, Yu Tao, Jaime A. Fernandez-Baca +2
Stacking variations in quasi-2D materials can have an important influence on material properties, such as changing the topology of the band structure. Unfortunately, the weakness o…
Gapless Dirac magnons in CrCl
John A. Schneeloch, Yu Tao, Yongqiang Cheng +4
Bosonic Dirac materials are testbeds for dissipationless spin-based electronics. In the quasi two-dimensional honeycomb lattice of CrX (X=Cl, Br, I), Dirac magnons have been…
T to 1T structural phase transition in WTe Weyl semimetal
Yu Tao, John A. Schneeloch, Adam A. Aczel +1
Elastic neutron scattering on a single crystal and powder X-ray diffraction measurements were carried out to investigate how the crystal structure evolves as a function of temperat…
Evolution of the structural transition in MoWTe
John A. Schneeloch, Yu Tao, Chunruo Duan +7
The composition dependence of the structural transition between the monoclinic 1T and orthorhombic T phases in the MoWTe Weyl semimetal was inv…
Coulomb Blockade Effects in a Topological Insulator Grown on a High-Tc Cuprate Superconductor
Bryan Rachmilowitz, He Zhao, Zheng Ren +9
The evidence for proximity-induced superconductivity in heterostructures of topological insulators and high-Tc cuprates has been intensely debated. We use molecular beam epitaxy to…
Observation of a thermoelectric Hall plateau in the extreme quantum limit
Wenjie Zhang, Peipei Wang, Brian Skinner +10
The thermoelectric Hall effect is the generation of a transverse heat current upon applying an electric field in the presence of a magnetic field. Here we demonstrate that the ther…
Appearance of T phase across the T-1T phase boundary in Weyl semimetal MoTe
Yu Tao, John A. Schneeloch, Chunruo Duan +6
Using elastic neutron scattering on single crystals of MoTe and MoWTe (), the temperature dependence of the recently discovered T$_{d}^{*…
Emergence of topologically protected states in MoTe Weyl semimetal with layer stacking order
John A. Schneeloch, Chunruo Duan, Xiaoping Wang +3
Electronic tunability in crystals with weakly-bound layers can be achieved through layer stacking order. One such example is MoTe, where the low-temperature orthorhombic T…
Three-dimensional quantum Hall effect and metal-insulator transition in ZrTe5
Fangdong Tang, Yafei Ren, Peipei Wang +8
Symmetry, dimensionality, and interaction are crucial ingredients for phase transitions and quantum states of matter. As a prominent example, the integer quantum Hall effect (QHE)…
Spin-wave induced phonon resonance in multiferroic BiFeO
Zhijun Xu, J. A. Schneeloch, Jinsheng Wen +13
We report the direct observation of a "resonance" mode in the lowest-energy optic phonon very near the zone center around (111) in the multiferroic BiFeO using neutron scatteri…
Low vibration high numerical aperture automated variable temperature Raman microscope
Yao Tian, Anjan A. Reijnders, Gavin B. Osterhoudt +8
Raman micro-spectroscopy is well suited for studying a variety of properties and has been applied to wide- ranging areas. Combined with tuneable temperature, Raman spectra can offe…
Phonon coupling to dynamic short-range polar order in a relaxor ferroelectric near the morphotropic phase boundary
John A. Schneeloch, Zhijun Xu, B. Winn +4
We report neutron inelastic scattering experiments on single crystal PbMgNbO doped with 32\% PbTiO, a relaxor ferroelectric that lies close to the morph…
Surface collective modes in the topological insulators BiSe and BiSbTeSe
A. Kogar, S. Vig, A. Thaler +13
We used low-energy, momentum-resolved inelastic electron scattering to study surface collective modes of the three-dimensional topological insulators BiSe and BiSb$…
Optical spectroscopy study of three dimensional Dirac semimetal ZrTe
R. Y. Chen, S. J. Zhang, J. A. Schneeloch +4
Three dimensional (3D) topological Dirac materials are under intensive study recently. The layered compound ZrTe has been suggested to be one of them by transport and ARPES exp…
Surface-state-dominated transport in crystals of the topological crystalline insulator In-doped PbSnTe
Ruidan Zhong, Xugang He, John A. Schneeloch +8
Three-dimensional topological insulators and topological crystalline insulators represent new quantum states of matter, which are predicted to have insulating bulk states and spin-…
Imaging Dirac-Mass Disorder from Magnetic Dopant-Atoms in the Ferromagnetic Topological Insulator Cr(BiSb)Te
Inhee Lee, Chung Koo Kim, Jinho Lee +8
To achieve and utilize the most exotic electronic phenomena predicted for the surface states of 3D topological insulators (TI),it is necessary to open a "Dirac-mass gap" in their s…
Neutron inelastic scattering measurements of low energy phonons in the multiferroic BiFeO3
John A. Schneeloch, Zhijun Xu Jinsheng Wen, P. M. Gehring +11
We present neutron inelastic scattering measurements of the low-energy phonons in single crystal BiFeO3. The dispersions of the three acoustic phonon modes (LA along [100], TA1 alo…
Bulk Signatures of Pressure-Induced Band Inversion and Topological Phase Transitions in PbSnSe
Xiaoxiang Xi, Xu-Gang He, Fen Guan +10
The characteristics of topological insulators are manifested in both their surface and bulk properties, but the latter remain to be explored. Here we report bulk signatures of pres…
In-Plane Orbital Texture Switch at the Dirac Point in the Topological Insulator Bi2Se3
Yue Cao, J. A. Waugh, X. -W. Zhang +13
Topological insulators are novel macroscopic quantum-mechanical phase of matter, which hold promise for realizing some of the most exotic particles in physics as well as applicatio…