John Singleton
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View article: Entanglement Randomness and Gapped Itinerant Carriers in a Frustrated Quantum Magnet
Entanglement Randomness and Gapped Itinerant Carriers in a Frustrated Quantum Magnet Open
The quantum spin liquid is a state manifesting extraordinary many-body entanglement, and the material NaYbSe 2 is thought to be one of the most promising candidates for its realization. Through low-temperature heat capacity and t…
View article: Reentrant Landau Levels in a Dirac topological insulator
Reentrant Landau Levels in a Dirac topological insulator Open
The quantum limit, where magnetic fields confine carriers to the lowest Landau level, is predicted to host exotic quantum phases arising from strengthened electronic correlations, reduced dimensionality, and increased degeneracy. We report…
View article: Quantum oscillations and transport properties of layered single-crystal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>SrCu</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Quantum oscillations and transport properties of layered single-crystal Open
We report a systematic investigation of the physical properties and Fermi-surface topology of layered single-crystal \ce{SrCu4As2} using electrical transport, magnetotransport, and quantum-oscillation experiments plus band-structure calcul…
View article: High-magnetic-field phases in U <sub>1-x</sub> Th <sub>x</sub> Te <sub>2</sub>
High-magnetic-field phases in U <sub>1-x</sub> Th <sub>x</sub> Te <sub>2</sub> Open
At temperatures T much lower than its superconducting critical temperature T c = 2.1 K, the heavy fermion superconductor UTe 2 has a unique phase diagram of magnetic field H vs. φ and θ, angles H is tilted from the b -axis toward the a - a…
View article: Quantum Oscillations in the Heat Capacity of Kondo Insulator <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>YbB</mml:mi></mml:mrow><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Quantum Oscillations in the Heat Capacity of Kondo Insulator Open
We observe magnetic quantum oscillations in the heat capacity of the Kondo insulator YbB_{12}. The frequency of these oscillations, F=700 T, agrees with that from magnetoresistance and torque magnetometry experiments for μ_{0}H>35 T in the…
View article: Single-ion anisotropy driven chiral magnetic order in a spin-1 antiferromagnetic chain
Single-ion anisotropy driven chiral magnetic order in a spin-1 antiferromagnetic chain Open
Chirality in magnetic systems gives rise to a wide range of exotic phenomena, yet its influence in $S=1$ chains remains largely unexplored. Here, we present a comprehensive experimental study of a chiral antiferromagnetic (AFM) $S=1$ chain…
View article: Magnetic field induced ordering in the spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:math> chiral chain compound <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>[</mml:mo><mml:msub><mml:mrow><mml:mi>Cu</mml:mi><mml:mo>(</mml:mo><mml:mi>pym</mml:mi><mml:mo>)</mml:mo><mml:mo>(</mml:mo><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mo>)</mml:mo><mml:msub><mml:mrow/><mml:mn>4</mml:mn></mml:msub><mml:mo>]</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi>SiF</mml:mi></mml:mrow><mml:mn>6</mml:mn></mml:msub><mml:mo>·</mml:mo></mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">O</mml:mi></mml:math>
Magnetic field induced ordering in the spin- chiral chain compound Open
We present single-crystal neutron diffraction, powder muon spin rotation, and pulsed-field magnetometry measurements on the Heisenberg quantum chiral chain [Cu(pym)(H2O)4]SiF6·H2O (pym = pyrimidine), which displays a fourfold-periodic rota…
View article: Spin Dynamics in the Dirac U(1) Spin Liquid <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>YbZn</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>GaO</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:mrow></mml:math>
Spin Dynamics in the Dirac U(1) Spin Liquid Open
YbZn2GaO5 is a promising candidate for realizing a quantum spin liquid (QSL) state, particularly owing to its lack of significant site disorder. Pulsed-field magnetometry at 0.5 K shows magnetization saturating near 15 T, with a corrected …
View article: Thermodynamic Evidence of Fermionic Behavior in the Vicinity of One-Ninth Plateau in a Kagome Antiferromagnet
Thermodynamic Evidence of Fermionic Behavior in the Vicinity of One-Ninth Plateau in a Kagome Antiferromagnet Open
The spin-1/2 kagome Heisenberg antiferromagnets are believed to host exotic quantum entangled states. Recently, the reports of 1/9 magnetization plateau and magnetic oscillations in a kagome antiferromagnet YCu3(OH)6Br2[Brx(OH)1−x] (YCOB) …
View article: Abstract 1174 Optimizing genetically-encoded tools to study peroxisomes in live cells
Abstract 1174 Optimizing genetically-encoded tools to study peroxisomes in live cells Open
View article: Magnetic Properties Tuning via Broad Range Site Deficiency in Square Net Material UCu<sub><i>x</i></sub>Bi<sub>2</sub>
Magnetic Properties Tuning via Broad Range Site Deficiency in Square Net Material UCu<sub><i>x</i></sub>Bi<sub>2</sub> Open
HfCuSi2-type pnictogen compounds have recently been shown to be a versatile platform for designing materials with topologically nontrivial band structures. However, these phases require strict control over the electron count to …
View article: Unconventional magnetic oscillations in a kagome Mott insulator
Unconventional magnetic oscillations in a kagome Mott insulator Open
In metals, electrons in a magnetic field undergo cyclotron motion, leading to oscillations in physical properties called quantum oscillations. This phenomenon has never been seen in a robust insulator because there are no mobile electrons.…
View article: Spin dynamics in the Dirac $U(1)$ spin liquid YbZn$_2$GaO$_5$
Spin dynamics in the Dirac $U(1)$ spin liquid YbZn$_2$GaO$_5$ Open
YbZn$_2$GaO$_5$ is a promising candidate for realizing a quantum spin liquid (QSL) state, particularly owing to its lack of significant site disorder. Pulsed-field magnetometry at 0.5 K shows magnetization saturating near 15 T, with a corr…
View article: Magnetic properties of a staggered <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:math> chain with an alternating single-ion anisotropy direction
Magnetic properties of a staggered chain with an alternating single-ion anisotropy direction Open
Materials composed of spin-1 antiferromagnetic (AFM) chains are known to adopt complex ground states that are sensitive to the single-ion-anisotropy (SIA) energy (D), and intrachain (J0) and interchain (J1,2′) exchange energy scales. While…
View article: High-Magnetic Field Phases in U$_{1-x}$Th$_x$Te$_2$
High-Magnetic Field Phases in U$_{1-x}$Th$_x$Te$_2$ Open
At temperatures much lower than its superconducting critical temperature $T_c$ of 2.1 K, the heavy fermion superconductor UTe$_2$ has a remarkable phase diagram of magnetic field $H$ vs. angles $ϕ$ and $θ$ at which $H$ is tilted away from …
View article: Competing electronic ground states in the heavy-fermion superconductor CeRh2As2
Competing electronic ground states in the heavy-fermion superconductor CeRh2As2 Open
CeRh2As2 is rare among superconductors, in that magnetic field tunes it between two distinct superconducting phases. Combined with a lack of local inversion symmetry and an upper critical field exceeding the Pauli paramagnetic limit, this …
View article: Timing of Seven Isolated Pulsars in the Globular Cluster Terzan 1
Timing of Seven Isolated Pulsars in the Globular Cluster Terzan 1 Open
Globular clusters host large populations of millisecond pulsars (MSPs) due to their high gravitational encounter rates, producing many binary systems and thus MSPs via the recycling process. Seven pulsars with spin periods ranging from 3 m…
View article: Meissner Effect and Nonreciprocal Charge Transport in Non-Topological 1T-CrTe2/FeTe Heterostructures
Meissner Effect and Nonreciprocal Charge Transport in Non-Topological 1T-CrTe2/FeTe Heterostructures Open
Interface-induced superconductivity has recently been achieved by stacking a magnetic topological insulator layer on an antiferromagnetic FeTe layer. However, the mechanism driving this emergent superconductivity remains unclear. Here, we …
View article: Nature of quantum criticality in the Ising ferromagnet TbV$_6$Sn$_6$
Nature of quantum criticality in the Ising ferromagnet TbV$_6$Sn$_6$ Open
TbV$_6$Sn$_6$ is a topological metal where ferromagnetic Tb ions with strong uniaxial magnetic anisotropy interact with V kagome layers. Inelastic neutron scattering (INS) measurements show that the Tb ions adopt an Ising doublet ground st…
View article: Pseudo-easy-axis anisotropy in antiferromagnetic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:math> diamond-lattice systems
Pseudo-easy-axis anisotropy in antiferromagnetic diamond-lattice systems Open
We investigate the magnetic properties of S=1 antiferromagnetic diamond-lattice, NiX2(pyrimidine)2 (X=Cl, Br), hosting a single-ion anisotropy (SIA) orientation which alternates between neighboring sites. Through neutron diffraction measur…
View article: Large magnetoresistance and first-order phase transition in antiferromagnetic single-crystalline <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>EuAg</mml:mi><mml:msub><mml:mrow/><mml:mn>4</mml:mn></mml:msub><mml:mi>Sb</mml:mi><mml:msub><mml:mrow/><mml:mn>2</mml:mn></mml:msub></mml:math>
Large magnetoresistance and first-order phase transition in antiferromagnetic single-crystalline Open
View article: Thermodynamic evidence of fermionic behavior in the vicinity of one-ninth plateau in a kagome antiferromagnet
Thermodynamic evidence of fermionic behavior in the vicinity of one-ninth plateau in a kagome antiferromagnet Open
The spin-1/2 kagome Heisenberg antiferromagnets are believed to host exotic quantum entangled states. Recently, the report of 1/9 magnetization plateau and magnetic oscillations in a kagome antiferromagnet YCu$_3$(OH)$_6$Br$_2$[Br$_x$(OH)$…
View article: Magnetic properties of a staggered $S=1$ chain Ni(pym)(H$_{2}$O)$_{2}$(NO$_{3}$)$_{2}$ with an alternating single-ion anisotropy direction
Magnetic properties of a staggered $S=1$ chain Ni(pym)(H$_{2}$O)$_{2}$(NO$_{3}$)$_{2}$ with an alternating single-ion anisotropy direction Open
Materials composed of spin-1 antiferromagnetic (AFM) chains are known to adopt complex ground states which are sensitive to the single-ion-anisotropy (SIA) energy ($D$), and intrachain ($J_{0}$) and interchain ($J'_{i}$) exchange energy sc…
View article: Direct evidence from high-field magnetotransport for a dramatic change of quasiparticle character in van der Waals ferromagnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Fe</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>GeTe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Direct evidence from high-field magnetotransport for a dramatic change of quasiparticle character in van der Waals ferromagnet Open
Magnetometry and magnetoresistance (MR) data taken on the van der Waals ferromagnet Fe3−xGeTe2 (FGT) reveal three distinct contributions to the MR: a linear negative component, a contribution from closed Fermi-surface orbits, and an enhanc…
View article: Magnetoresistance and Anisotropic Spin Dynamics in Antiferromagnetic Semiconductor Eu$_5$Sn$_2$As$_6$
Magnetoresistance and Anisotropic Spin Dynamics in Antiferromagnetic Semiconductor Eu$_5$Sn$_2$As$_6$ Open
We report on the thermodynamic and transport properties of the rare-earth Zintl compound Eu$_5$Sn$_2$As$_6$, which orders as a canted antiferromagnetic magnetic semiconductor at 10.3~K. The system also displays a complex cascade of magneti…
View article: Entanglement Randomness and Gapped Itinerant Carriers in a Frustrated Quantum Magnet
Entanglement Randomness and Gapped Itinerant Carriers in a Frustrated Quantum Magnet Open
The quantum spin liquid (QSL) is a state manifesting extraordinary many-body entanglement, and the material NaYbSe$_2$ is thought to be one of the most promising candidates for its realization. Through low-temperature heat capacity and the…
View article: Large magnetoresistance and first-order phase transition in antiferromagnetic single-crystalline EuAg$_4$Sb$_2$
Large magnetoresistance and first-order phase transition in antiferromagnetic single-crystalline EuAg$_4$Sb$_2$ Open
We present the results of a thorough investigation of the physical properties of EuAg$_4$Sb$_2$ single crystals using magnetization, heat capacity, and electrical resistivity measurements. High-quality single crystals, which crystallize in…
View article: Pseudo-easy-axis anisotropy in antiferromagnetic $S=1$ diamond-lattice systems Ni$X_{2}$(pym)$_{2}$
Pseudo-easy-axis anisotropy in antiferromagnetic $S=1$ diamond-lattice systems Ni$X_{2}$(pym)$_{2}$ Open
We investigate the magnetic properties of $S=1$ antiferromagnetic diamond lattice, Ni$X_{2}$(pyrimidine)$_{2}$ ($X$ = Cl, Br), hosting a single-ion anisotropy (SIA) orientation which alternates between neighbouring sites. Through neutron d…
View article: Author Correction: Magnetic breakdown and spin-zero effect in quantum oscillations in kagome metal CsV3Sb5
Author Correction: Magnetic breakdown and spin-zero effect in quantum oscillations in kagome metal CsV3Sb5 Open
View article: Orphan high field superconductivity in non-superconducting uranium ditelluride
Orphan high field superconductivity in non-superconducting uranium ditelluride Open