6 research outputs found
Comparative Electronic Structures of the Chiral Helimagnets Cr1/3NbS2 and Cr1/3TaS2
Magnetic materials with noncollinear spin textures are promising for
spintronic applications. To realize practical devices, control over the length
and energy scales of such spin textures is imperative. The chiral helimagnets
Cr1/3NbS2 and Cr1/3TaS2 exhibit analogous magnetic phase diagrams with
different real-space periodicities and field dependence, positioning them as
model systems for studying the relative strengths of the microscopic mechanisms
giving rise to exotic spin textures. Here, we carry out a comparative study of
the electronic structures of Cr1/3NbS2 and Cr1/3TaS2 using angle-resolved
photoemission spectroscopy and density functional theory. We show that bands in
Cr1/3TaS2 are more dispersive than their counterparts in Cr1/3NbS2 and connect
this result to bonding and orbital overlap in these materials. We also
unambiguously distinguish exchange splitting from surface termination effects
by studying the dependence of their photoemission spectra on polarization,
temperature, and beam size. We find strong evidence that hybridization between
intercalant and host lattice electronic states mediates the magnetic exchange
interactions in these materials, suggesting that band engineering is a route
toward tuning their spin textures. Overall, these results underscore how the
modular nature of intercalated transition metal dichalcogenides translates
variation in composition and electronic structure to complex magnetism.Comment: 46 pages, 18 figures, 5 table
Nature of the current-induced insulator-to-metal transition in CaRuO as revealed by transport-ARPES
The Mott insulator CaRuO exhibits a rare insulator-to-metal
transition (IMT) induced by DC current. While structural changes associated
with this transition have been tracked by neutron diffraction, Raman
scattering, and x-ray spectroscopy, work on elucidating the response of the
electronic degrees of freedom is still in progress. Here we unveil the
current-induced modifications of the electronic states of CaRuO by
employing angle-resolved photoemission spectroscopy (ARPES) in conjunction with
four-probe transport. Two main effects emerge: a clear reduction of the Mott
gap and a modification in the dispersion of the Ru-bands. The changes in
dispersion occur exclusively along the high-symmetry direction, parallel
to the -axis where the greatest in-plane lattice change occurs. These
experimental observations are reflected in dynamical mean-field theory (DMFT)
calculations simulated exclusively from the current-induced lattice constants,
indicating a current driven structural transition as the primary mechanism of
the IMT. Furthermore, we demonstrate this phase is distinct from the
high-temperature zero-current metallic phase. Our results provide insight into
the elusive nature of the current-induced IMT of CaRuO and advance the
challenging, yet powerful, technique of transport-ARPES.Comment: 8 pages, 4 figure
Three-Dimensional Flat Bands and Dirac Cones in a Pyrochlore Superconductor
Emergent phases often appear when the electronic kinetic energy is comparable
to the Coulomb interactions. One approach to seek material systems as hosts of
such emergent phases is to realize localization of electronic wavefunctions due
to the geometric frustration inherent in the crystal structure, resulting in
flat electronic bands. Recently, such efforts have found a wide range of exotic
phases in the two-dimensional kagome lattice, including magnetic order,
time-reversal symmetry breaking charge order, nematicity, and
superconductivity. However, the interlayer coupling of the kagome layers
disrupts the destructive interference needed to completely quench the kinetic
energy. Here we experimentally demonstrate that an interwoven kagome network--a
pyrochlore lattice--can host a three dimensional (3D) localization of electron
wavefunctions. In particular, through a combination of angle-resolved
photoemission spectroscopy, fundamental lattice model and density functional
theory (DFT) calculations, we present the novel electronic structure of a
pyrochlore superconductor, CeRu. We find striking flat bands with
bandwidths smaller than 0.03 eV in all directions--an order of magnitude
smaller than that of kagome systems. We further find 3D gapless Dirac cones
predicted originally by theory in the diamond lattice space group with
nonsymmorphic symmetry. Our work establishes the pyrochlore structure as a
promising lattice platform to realize and tune novel emergent phases
intertwining topology and many-body interactions.Comment: 12 pages, 3 figure
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Comparative Electronic Structures of the Chiral Helimagnets Cr1/3NbS2 and Cr1/3TaS2
Magnetic materials with noncollinear spin textures are promising for spintronic applications. To realize practical devices, control over the length and energy scales of such spin textures is imperative. The chiral helimagnets Cr1/3NbS2 and Cr1/3TaS2 exhibit analogous magnetic-phase diagrams with different real-space periodicities and field dependence, positioning them as model systems for studying the relative strengths of the microscopic mechanisms giving rise to exotic spin textures. Although the electronic structure of the Nb analogue has been experimentally investigated, the Ta analogue has received far less attention. Here, we present a comprehensive suite of electronic structure studies on both Cr1/3NbS2 and Cr1/3TaS2 using angle-resolved photoemission spectroscopy and density functional theory. We show that bands in Cr1/3TaS2 are more dispersive than their counterparts in Cr1/3NbS2, resulting in markedly different Fermi wavevectors. The fact that their qualitative magnetic phase diagrams are nevertheless identical shows that hybridization between the intercalant and host lattice mediates the magnetic exchange interactions in both of these materials. We ultimately find that ferromagnetic coupling is stronger in Cr1/3TaS2, but larger spin-orbit coupling (and a stronger Dzyaloshinskii-Moriya interaction) from the heavier host lattice ultimately gives rise to shorter spin textures
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Spectral evidence for unidirectional charge density wave in detwinned BaNi2As2
In the iron-based superconductors, unconventional superconductivity emerges in proximity to intertwined electronic orders consisting of an electronic nematic order and a spin density wave (SDW). Recently, BaNi2As2, like its well-known iron-based analog BaFe2As2, has been discovered to host a symmetry-breaking structural transition but coupled to a unidirectional charge density wave (CDW) instead of SDW, providing a novel platform to study intertwined orders. Here, through a systematic angle-resolved photoemission spectroscopy study combined with a detwinning B1g uniaxial strain, we identify distinct spectral evidence of band evolution due to the structural transition as well as CDW-induced band folding. In contrast to the nematicity and spin density wave in BaFe2As2, the structural and CDW order parameters in BaNi2As2 are observed to be strongly coupled and do not separate in the presence of uniaxial strain. Furthermore, no nematic band splitting is resolved above the structural transition. Our measurements point to a likely lattice origin of the CDW order in BaNi2As2
Kramers nodal lines and Weyl fermions in SmAlSi
Abstract Kramers nodal lines (KNLs) have recently been proposed theoretically as a special type of Weyl line degeneracy connecting time-reversal invariant momenta. KNLs are robust to spin orbit coupling and are inherent to all non-centrosymmetric achiral crystal structures, leading to unusual spin, magneto-electric, and optical properties. However, their existence in in real quantum materials has not been experimentally established. Here we gather the experimental evidence pointing at the presence of KNLs in SmAlSi, a non-centrosymmetric metal that develops incommensurate spin density wave order at low temperature. Using angle-resolved photoemission spectroscopy, density functional theory calculations, and magneto-transport methods, we provide evidence suggesting the presence of KNLs, together with observing Weyl fermions under the broken inversion symmetry in the paramagnetic phase of SmAlSi. We discuss the nesting possibilities regarding the emergent magnetic orders in SmAlSi. Our results provide a solid basis of experimental observations for exploring correlated topology in SmAlS