129 citations · 746 across the 23 of their papers we have counts for
25 papers
Heterometallic spin-1/2 quantum magnet under hydrostatic pressure
M. J. Coak, D. Kamenskyi, S. P. M. Curley +14
We investigate the properties of CuVOF(HO)HO, in which two different spin species, Cu(II) and V(IV), form antiferromagnetic spin-1/2 dimers with weak interdi…
Emergent Polar Metal Phase in a Van der Waals Mott Magnet
Shiyu Deng, Matthew J. Coak, Charles R. S. Haines +16
We report the emergence of a two-dimensional (2D) polar metal phase in van der Waals compound FePSe under moderate pressures. This layered material is a Mott insulator with ant…
Direct evidence from high-field magnetotransport for a dramatic change of quasiparticle character in van der Waals ferromagnet FeGeTe
Shroya Vaidya, Matthew J. Coak, Daniel A. Mayoh +4
Magnetometry and magnetoresistance (MR) data taken on the van der Waals ferromagnet FeGeTe (FGT) reveal three distinct contributions to the MR: a linear negative compon…
Thermal Hall effects due to topological spin fluctuations in YMnO
Ha-Leem Kim, Takuma Saito, Heejun Yang +7
The thermal Hall effect in magnetic insulators has been considered a powerful method for examining the topological nature of charge-neutral quasiparticles such as magnons. Yet, unl…
Asymmetric phase diagram and dimensional crossover in a system of spin-1/2 dimers under applied hydrostatic pressure
M. J. Coak, S. P. M. Curley, Z. Hawkhead +8
We present the magnetic and structural properties of [Cu(pyrazine)(glycine)]ClO under applied pressure. As previously reported, at ambient pressure this material consis…
Magnetotransport of single crystal SmIrO across the pressure-induced quantum-critical phase boundary
M. J. Coak, K. Götze, T. Northam De La Fuente +6
Rare-earth pyrochlore iridates host two interlocking magnetic sublattices of corner-sharing tetrahedra and can harbour a unique combination of frustrated moments, exotic excitation…
Comparative structural evolution under pressure of powder and single crystals of the layered antiferromagnet FePS
David M. Jarvis, Matthew J. Coak, Hayrullo Hamidov +9
The layered antiferromagnet FePS has been shown to undergo a structural transition under pressure linked to an insulator-metal transition, with two incompatible models previous…
Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOsSb
K. Götze, M. J. Pearce, M. J. Coak +9
CeOsSb, a member of the skutterudite family, has an unusual semimetallic low-temperature -phase that inhabits a wedge-like area of the field - temperature $…
Anomalous magnetic exchange in a dimerized quantum-magnet composed of unlike spin species
S. P. M. Curley, B. M. Huddart, D. Kamenskyi +15
We present here a study of the magnetic properties of the antiferromagnetic dimer material CuVOF(HO)HO, in which the dimer unit is composed of two different $S…
Highly efficient nonvolatile magnetization switching and multi-level states by current in single van der Waals topological ferromagnet Fe3GeTe2
Kaixuan Zhang, Youjin Lee, Matthew J. Coak +10
Robust multi-level spin memory with the ability to write information electrically is a long-sought capability in spintronics, with great promise for applications. Here we achieve n…
Gigantic current control of coercive field and magnetic memory based on nm-thin ferromagnetic van der Waals Fe3GeTe2
Kaixuan Zhang, Seungyun Han, Youjin Lee +11
Controlling magnetic states by a small current is essential for the next-generation of energy-efficient spintronic devices. However, it invariably requires considerable energy to c…
Sizeable suppression of thermal Hall effect upon isotopic substitution in strontium titanate
Sangwoo Sim, Heejun Yang, Ha-Leem Kim +4
We report measurements of the thermal Hall effect in single crystals of both pristine and isotopically substituted strontium titanate. We discovered a two orders of magnitude diffe…
Kagome van-der-Waals Pd3P2S8 with flat band
Seunghyun Park, Soonmin Kang, Haeri Kim +13
With the advanced investigations into low-dimensional systems, it has become essential to find materials having interesting lattices that can be exfoliated down to monolayer. One p…
Pressure-induced huge increase of Curie temperature of the van der Waals ferromagnet VI3
J. Valenta, M. Kratochvílová, M. Míšek +12
Evolution of magnetism in single crystals of the van der Waals compound VI3 in external pressure up to 7.3 GPa studied by measuring magnetization and ac magnetic susceptibility is…
Evolution of magnetic order in van-der-Waals antiferromagnet FePS through insulator-metal transition
Matthew J. Coak, David M Jarvis, Hayrullo Hamidov +14
Layered van-der-Waals 2D magnetic materials are of great interest in fundamental condensed-matter physics research, as well as for potential applications in spintronics and device…
Observation of plateau-like magnetoresistance in twisted Fe3GeTe2/Fe3GeTe2 junction
Junghyun Kim, Suhan Son, Matthew. J. Coak +4
Controlling the stacking of van der Waals (vdW) materials is found to produce exciting new findings, since hetero- or homo- structures have added the diverse possibility of assembl…
Local nuclear and magnetic order in the two-dimensional spin glass, MnFePS
J. N. Graham, M. J. Coak, S. Son +4
We present a comprehensive study of the short-ranged nuclear and magnetic order in the two-dimensional spin glass, MnFePS. Nuclear neutron scattering data revea…
Strongly adhesive dry transfer technique for van der Waals heterostructure
Suhan Son, Young Jae Shin, Kaixuan Zhang +11
That one can stack van der Waals materials with atomically sharp interfaces has provided a new material platform of constructing heterostructures. The technical challenge of mechan…
SquidLab -- a user-friendly program for background subtraction and fitting of magnetization data
Matthew J. Coak, Cheng Liu, David M. Jarvis +3
We present an open-source program free to download for academic use with full user-friendly graphical interface for performing flexible and robust background subtraction and dipole…
Pressure dependence of ferroelectric quantum critical fluctuations
M. J. Coak, C. R. S. Haines, C. Liu +2
The effect of ferroelectric fluctuations on the temperature dependent dielectric constant of SrTiO(STO) has been long studied. Those fluctuations have been shown in recent ye…
Isostructural Mott Transition in 2D honeycomb antiferromagnet VPS
M. J. Coak, S. Son, D. Daisenberger +7
We present the observation of an isostructural Mott insulator-metal transition in van-der-Waals honeycomb antiferromagnet VPS through high-pressure x-ray diffraction an…
Bulk properties of van-der-Waals hard ferromagnet VI3
Suhan Son, Matthew J. Coak, Nahyun Lee +12
We present comprehensive measurements of the structural, magnetic and electronic properties of layered van-der-Waals ferromagnet VI down to low temperatures. Despite belonging…
Quantum Critical Phenomena in a Compressible Displacive Ferroelectric
M J Coak, C R S Haines, C Liu +3
The dielectric and magnetic polarizations of quantum paraelectrics and paramagnetic materials have in many cases been found to initially increase with increasing thermal disorder a…
Symmetry breaking and unconventional charge ordering in single crystal NaRuO
Arvind Yogi, C. I. Sathish, Hasung Sim +3
The interplay of charge, spin, and lattice degrees of freedom in matter leads to various forms of ordered states through phase transitions. An important subclass of these phenomena…