Veronika Sunko
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View article: Unconventional Superlattice Ordering in Intercalated Transition Metal Dichalcogenide V<sub>1/3</sub>NbS<sub>2</sub>
Unconventional Superlattice Ordering in Intercalated Transition Metal Dichalcogenide V<sub>1/3</sub>NbS<sub>2</sub> Open
The interplay between symmetry and topology in magnetic materials makes it possible to engineer exotic phases and technologically useful properties. A key requirement for these pursuits is achieving control over local crystallographic and …
View article: Anisotropic Multi-Q Order in CoxTaS2
Anisotropic Multi-Q Order in CoxTaS2 Open
The cobalt-intercalated transition metal dichalcogenide Co$_x$TaS$_2$ hosts a rich landscape of magnetic phases that depend sensitively on $x$. While the stoichiometric compound with $x=1/3$ exhibits a single magnetic transition, samples w…
View article: Goldstone mode of the broken helix in U(1) magnet EuIn2As2
Goldstone mode of the broken helix in U(1) magnet EuIn2As2 Open
Goldstone modes acquire a frequency gap in the presence of perturbations that break the underlying continuous symmetry. Here, we study the response of a spin-based Goldstone mode to strain and magnetic field in the broken helix, a multi-$\…
View article: Orbital-spin Locking and its Optical Signatures in Altermagnets
Orbital-spin Locking and its Optical Signatures in Altermagnets Open
Altermagnets, magnetic materials with zero magnetization and spin-split band structure, have gained tremendous attention recently for their rich physics and potential applications. Here, we report on a microscopic tight-binding model that …
View article: The Lorenz ratio as a guide to scattering contributions to transport in strongly correlated metals
The Lorenz ratio as a guide to scattering contributions to transport in strongly correlated metals Open
In many physical situations in which many-body assemblies exist at temperature T , a characteristic quantum-mechanical time scale of approximately can be identified in both theory and experiment, leading to speculation that it may…
View article: Multimodal Approach Reveals the Symmetry-Breaking Pathway to the Broken Helix in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>EuIn</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>As</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Multimodal Approach Reveals the Symmetry-Breaking Pathway to the Broken Helix in Open
Understanding and manipulating emergent phases, which are themes at the forefront of quantum-materials research, rely on identifying their underlying symmetries. This general principle has been particularly prominent in materials with coup…
View article: Response to “Comment on ‘A spatially resolved optical method to measure thermal diffusivity’” [Rev. Sci. Instrum. 95, 047101 (2024)]
Response to “Comment on ‘A spatially resolved optical method to measure thermal diffusivity’” [Rev. Sci. Instrum. 95, 047101 (2024)] Open
View article: Symmetry-breaking pathway towards the unpinned broken helix
Symmetry-breaking pathway towards the unpinned broken helix Open
One of the prime material candidates to host the axion insulator state is EuIn$_{2}$As$_{2}$. First-principles calculations predicted the emergence of this exotic topological phase based on the assumption of a collinear antiferromagnetic s…
View article: Linear magneto-conductivity as a DC probe of time-reversal symmetry breaking
Linear magneto-conductivity as a DC probe of time-reversal symmetry breaking Open
Several optical experiments have shown that in magnetic materials the principal axes of response tensors can rotate in a magnetic field. Here we offer a microscopic explanation of this effect, and propose a closely related DC transport phe…
View article: The Lorenz ratio as a guide to scattering contributions to Planckian transport
The Lorenz ratio as a guide to scattering contributions to Planckian transport Open
In many physical situations in which many-body assemblies exist at temperature $T$, a characteristic quantum-mechanical time scale of approximately $\hbar/k_{B}T$ can be identified in both theory and experiment, leading to speculation that…
View article: Elastocaloric signatures of symmetric and antisymmetric strain-tuning of quadrupolar and magnetic phases in DyB <sub>2</sub> C <sub>2</sub>
Elastocaloric signatures of symmetric and antisymmetric strain-tuning of quadrupolar and magnetic phases in DyB <sub>2</sub> C <sub>2</sub> Open
The adiabatic elastocaloric effect measures the temperature change of a given system with strain and provides a thermodynamic probe of the entropic landscape in the temperature-strain space. Here, we demonstrate that the DC bias strain-dep…
View article: Spin-carrier coupling induced ferromagnetism and giant resistivity peak in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">EuCd</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">P</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
Spin-carrier coupling induced ferromagnetism and giant resistivity peak in Open
EuCd2P2 is notable for its unconventional transport: upon cooling the metallic resistivity changes slope and begins to increase, ultimately 100-fold, before returning to its metallic value. Surprisingly, this giant pe…
View article: A spatially resolved optical method to measure thermal diffusivity
A spatially resolved optical method to measure thermal diffusivity Open
We describe an optical method to directly measure the position-dependent thermal diffusivity of reflective single crystal samples across a broad range of temperatures for condensed matter physics research. Two laser beams are used, one as …
View article: Elastocaloric signatures of symmetric and antisymmetric strain-tuning of quadrupolar and magnetic phases in DyB2C2
Elastocaloric signatures of symmetric and antisymmetric strain-tuning of quadrupolar and magnetic phases in DyB2C2 Open
The adiabatic elastocaloric effect measures the temperature change of given systems with strain and probes the entropic landscape in the temperature-strain space. In this study we demonstrate that the DC bias strain-dependence of AC elasto…
View article: Spin-carrier coupling induced ferromagnetism and giant resistivity peak in EuCd$_2$P$_2$
Spin-carrier coupling induced ferromagnetism and giant resistivity peak in EuCd$_2$P$_2$ Open
EuCd$_2$P$_2$ is notable for its unconventional transport: upon cooling the metallic resistivity changes slope and begins to increase, ultimately 100-fold, before returning to its metallic value. Surprisingly, this giant peak occurs at 18K…
View article: Tuneable electron–magnon coupling of ferromagnetic surface states in PdCoO2
Tuneable electron–magnon coupling of ferromagnetic surface states in PdCoO2 Open
View article: Tuneable electron–magnon coupling of ferromagnetic surface states in PdCoO$_2$
Tuneable electron–magnon coupling of ferromagnetic surface states in PdCoO$_2$ Open
Controlling spin wave excitations in magnetic materials underpins the burgeoning field of magnonics. Yet, little is known about how magnons interact with the conduction electrons of itinerant magnets, or how this interplay can be controlle…
View article: Surface and bulk electronic structure of aluminium diboride
Surface and bulk electronic structure of aluminium diboride Open
We report a combined experimental and theoretical study of the surface and bulk electronic structure of aluminium diboride, a nonsuperconducting sister compound of the superconductor MgB2. We perform angle-resolved photoemission measuremen…
View article: Controlled Introduction of Defects to Delafossite Metals by Electron Irradiation
Controlled Introduction of Defects to Delafossite Metals by Electron Irradiation Open
The delafossite metals PdCoO$_{2}$, PtCoO$_{2}$ and PdCrO$_{2}$ are among the highest conductivity materials known, with low temperature mean free paths of tens of microns in the best as-grown single crystals. A key question is whether the…
View article: Probing spin correlations using angle-resolved photoemission in a coupled metallic/Mott insulator system
Probing spin correlations using angle-resolved photoemission in a coupled metallic/Mott insulator system Open
An intrinsically nonmagnetic spectroscopy is shown to have strong magnetic sensitivity in Kondo-coupled PdCrO 2 .
View article: Direct observation of a uniaxial stress-driven Lifshitz transition in Sr2RuO4
Direct observation of a uniaxial stress-driven Lifshitz transition in Sr2RuO4 Open
View article: Hidden kagome-lattice picture and origin of high conductivity in delafossite PtCoO<sub>2</sub>
Hidden kagome-lattice picture and origin of high conductivity in delafossite PtCoO<sub>2</sub> Open
We study the electronic structure of delafossite PtCoO(2 )to elucidate its extremely small resistivity and high mobility. The band exhibits steep dispersion near the Fermi level despite the fact that it is formed mainly by Pt d orbitals th…
View article: Orbital- and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>k</mml:mi><mml:mi>z</mml:mi></mml:msub></mml:math>-Selective Hybridization of Se <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>4</mml:mn><mml:mi>p</mml:mi></mml:mrow></mml:math> and Ti <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>3</mml:mn><mml:mi>d</mml:mi></mml:mrow></mml:math> States in the Charge Density Wave Phase of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>TiSe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Orbital- and -Selective Hybridization of Se and Ti States in the Charge Density Wave Phase of Open
We revisit the enduring problem of the 2×2×2 charge density wave (CDW) order in TiSe_{2}, utilizing photon energy-dependent angle-resolved photoemission spectroscopy to probe the full three-dimensional high- and low-temperature electronic …
View article: Dual quantum confinement and anisotropic spin splitting in the multivalley semimetal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>PtSe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
Dual quantum confinement and anisotropic spin splitting in the multivalley semimetal Open
We investigate the electronic structure of a two-dimensional electron gas created at the surface of the multivalley semimetal 1T-PtSe2. Using angle-resolved photoemission and first-principles-based surface space-charge calculations, we sho…
View article: Angle Resolved Photoemission Spectroscopy of Delafossite Metals
Angle Resolved Photoemission Spectroscopy of Delafossite Metals Open
View article: Unconventional magneto-transport in ultrapure PdCoO2 and PtCoO2
Unconventional magneto-transport in ultrapure PdCoO2 and PtCoO2 Open
View article: Itinerant ferromagnetism of the Pd-terminated polar surface of PdCoO <sub>2</sub>
Itinerant ferromagnetism of the Pd-terminated polar surface of PdCoO <sub>2</sub> Open
The ability to modulate the collective properties of correlated electron systems at their interfaces and surfaces underpins the burgeoning field of “designer” quantum materials. Here, we show how an electronic reconstruction driven by surf…
View article: Spin Hall effect in 2D metallic delafossite PtCoO$_2$ and vicinity topology
Spin Hall effect in 2D metallic delafossite PtCoO$_2$ and vicinity topology Open
The two-dimensional (2D) metal PtCoO$_2$ is renowned for the lowest room temperature resistivity among all oxides, close to that of the top two materials Ag and Cu. In addition, we theoretically predict a strong intrinsic spin Hall effect.…
View article: Probing spin correlations using angle resolved photoemission in a\n coupled metallic/Mott insulator system
Probing spin correlations using angle resolved photoemission in a\n coupled metallic/Mott insulator system Open
A nearly free electron metal and a Mott insulating state can be thought of as\nopposite ends of possibilities for the motion of electrons in a solid. In the\nmagnetic oxide metal PdCrO$_{2}$, these two coexist as alternating layers.\nUsing…
View article: Fermiology and Superconductivity of Topological Surface States in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>PdTe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Fermiology and Superconductivity of Topological Surface States in Open
We study the low-energy surface electronic structure of the transition-metal\ndichalcogenide superconductor PdTe$_2$ by spin- and angle-resolved\nphotoemission, scanning tunneling microscopy, and density-functional\ntheory-based supercell …