A. Hallas

activity

20132026

most citedUnderstanding the role of entropy in high entropy oxides

560 citations · 2.3k across the 60 of their papers we have counts for

collaborators

Showing cond-mat.str-elShow all

37 papers · 1 filter

cond-mat.str-el2026

Geometric Approach to the High-Throughput Identification of Honeycomb Materials

Lex M. Rouquette, Alannah M. Hallas

The honeycomb lattice is an iconic structural motif in condensed matter physics. However, emerging theoretical models require the identification of new honeycomb lattice materials…

cond-mat.str-el2026

Prominent Dimensional Effects on High-order Harmonic Generation in Strongly Correlated Electron Systems

Kento Uchida, Shintaro Takayoshi, Yuta Murakami +6

Dimensionality strongly affects elementary excitations in correlated quantum materials, yet its impact on extreme nonlinear optical responses remains largely unexplored. Here, we c…

cond-mat.str-el2026

Rare-earth oxysulfides RE $_{2}$ O $_{2}$ S as model mixed-anion frustrated magnets

Austin M. Ferrenti, Ksenia Khoroshun, Mohamed Oudah +3

The study of low-dimensional and anisotropic magnetism is a promising avenue for the discovery of novel quantum phenomena. Mixed-anion materials, defined by the coordination of met…

cond-mat.str-el2026

K $_{2}$ Co $_{2}$ (TeO $_{3}$ ) $_{3}$ $\cdot$ 2.5 H $_{2}$ O : A mineral-inspired pseudo-honeycomb cobalt dimer antiferromagnet

Austin M. Ferrenti, Maxime A. Siegler, Yiqing Hao +9

In recent years, magnetically-frustrated triangular and honeycomb lattice cobaltates have seen extensive study in the pursuit of a quantum spin liquid (QSL) state in a real materia…

cond-mat.str-el2025

Vanishing ordered moment in the frustrated triangular lattice antiferromagnet CuNdO $_{2}$

Jonathan Gaudet, Dalmau Reig-i-Plessis, Bogeng Wen +9

We investigate the magnetic ground state of CuNdO $_{2}$ , which is a delafossite with a triangular lattice of magnetic Nd $^{3 +}$ ions that are well separated by non-magnetic Cu spacer…

cond-mat.str-el2023

Direct confirmation of long-range magnetic order and evidence for multipoles in Ce $_{2}$ O $_{3}$

Alexandra Cote, J. Eddie Slimak, Astha Sethi +10

The sesquioxide, Ce $_{2}$ O $_{3}$ , has been a material of intense interest in recent years due to reports of an anomalous giant magnetodielectric effect and emergent mixed crystal f…

cond-mat.str-el2021★ 8 cited

Neutron scattering study of the kagome metal Sc3Mn3Al7Si5

X. Y. Li, D. Reig-i-Plessis, P. -F. Liu +6

Sc3Mn3Al7Si5 is a rare example of a correlated metal in which the Mn moments form a kagome lattice. The absence of magnetic ordering to the lowest temperatures suggests that geomet…

cond-mat.str-el2021★ 15 cited

Absence of moment fragmentation in the mixed $B$ -site pyrochlore Nd $_{2}$ GaSbO $_{7}$

S. J. Gomez, P. M. Sarte, M. Zelensky +14

Nd-based pyrochlore oxides of the form Nd $_{2} B_{2}$ O $_{7}$ have garnered a significant amount of interest owing to the moment fragmentation physics observed in Nd $_{2}$ Zr $_{2}$ O$_…

cond-mat.str-el2020★ 33 cited

Frustrated Magnetism in Fluoride and Chalcogenide Pyrochlore Lattice Materials

Dalmau Reig-i-Plessis, Alannah M. Hallas

Pyrochlore lattices, which are found in two important classes of materials -- the $A_{2} B_{2} X_{7}$ pyrochlore family and the $A B_{2} X_{4}$ spinel family -- are the quintessential 3-dimensio…

cond-mat.str-el2020★ 5 cited

Field-induced quantum critical point in the new itinerant antiferromagnet Ti $_{3}$ Cu $_{4}$

Jaime M. Moya, Alannah M. Hallas, Vaideesh Loganathan +13

New phases of matter emerge at the edge of magnetic instabilities. In local moment systems, such as heavy fermions, the magnetism can be destabilized by pressure, chemical doping,…

cond-mat.str-el2020★ 4 cited

The Future of the Correlated Electron Problem

A. Alexandradinata, N. P. Armitage, Andrey Baydin +44

A central problem in modern condensed matter physics is the understanding of materials with strong electron correlations. Despite extensive work, the essential physics of many of t…

cond-mat.str-el2020★ 2 cited

Intertwined Magnetic Dipolar and Electric Quadrupolar Correlations in the Pyrochlore Tb $_{2}$ Ge $_{2}$ O $_{7}$

A. M. Hallas, W. Jin, J. Gaudet +12

We present a comprehensive experimental and theoretical study of the pyrochlore Tb $_{2}$ Ge $_{2}$ O $_{7}$ , an exemplary realization of a material whose properties are dominated by competit…

cond-mat.str-el2020★ 20 cited

Quantum critical point in the itinerant ferromagnet Ni $_{1 - x}$ Rh $_{x}$

C. -L. Huang, A. M. Hallas, K. Grube +9

We report a chemical substitution-induced ferromagnetic quantum critical point in polycrystalline Ni $_{1 - x}$ Rh $_{x}$ alloys. Through magnetization and muon spin relaxation measuremen…

cond-mat.str-el2019★ 7 cited

Complex Transport and Magnetism in Inhomogeneous Mixed Valence Ce $_{3}$ Ir $_{4}$ Ge $_{13}$

A. M. Hallas, C. L. Huang, Binod K. Rai +6

We report the discovery of Ce $_{3}$ Ir $_{4}$ Ge $_{13}$ , a new Remeika phase compound with a complex array of structural, electronic, and magnetic properties. Our single crystal x-ray dif…

cond-mat.str-el2019★ 24 cited

Intertwined magnetic, structural, and electronic transitions in V $_{2}$ O $_{3}$

Benjamin A. Frandsen, Yoav Kalcheim, Ilya Valmianski +15

We present a coordinated study of the paramagnetic-to-antiferromagnetic, rhombohedral-to-monoclinic, and metal-to-insulator transitions in thin-film specimens of the classic Mott i…

cond-mat.str-el2019★ 1 cited

Kondo exhaustion and conductive surface states in antiferromagnetic YbIr $_{3}$ Si $_{7}$

Macy Stavinoha, C. -L. Huang, W. Adam Phelan +13

The interplay of Kondo screening and magnetic ordering in strongly correlated materials containing local moments is a subtle problem.[1] Usually the number of conduction electrons…

cond-mat.str-el2019★ 18 cited

Coexistence of metallic and nonmetallic properties in the pyrochlore Lu $_{2}$ Rh $_{2}$ O $_{7}$

Alannah M. Hallas, Arzoo Z. Sharma, Cole Mauws +9

Transition metal oxides of the $4 d$ and $5 d$ block have recently become the targets of materials discovery, largely due to their strong spin-orbit coupling that can generate exotic…

cond-mat.str-el2019★ 13 cited

Probing the quantum phase transition in Mott insulator BaCoS_2 tuned by pressure and Ni-substitution

Z. Guguchia, B. A. Frandsen, D. Santos-Cottin +15

We present a muon spin relaxation study of the Mott transition in BaCoS_2 using two independent control parameters: (i) pressure p to tune the electronic bandwidth and (ii) Ni-subs…

cond-mat.str-el2018★ 9 cited

$μ$ SR study of spin freezing and persistent spin dynamics in NaCaNi $_{2}$ F $_{7}$

Y. Cai, M. N. Wilson, A. M. Hallas +8

A new pyrochlore compound, NaCaNi $_{2}$ F $_{7}$ , was recently synthesized and has a single magnetic site with spin-1 Ni $^{2 +}$ . We present zero field (ZF) and longitudinal field (LF) mu…

cond-mat.str-el2018★ 31 cited

Dipolar-Octupolar Ising Antiferromagnetism in Sm $_{2}$ Ti $_{2}$ O $_{7}$ : A Moment Fragmentation Candidate

C. Mauws, A. M. Hallas, G. Sala +14

Over the past two decades, the magnetic ground states of all rare earth titanate pyrochlores have been extensively studied, with the exception of Sm $_{2}$ Ti $_{2}$ O $_{7}$ . This is, in lar…

cond-mat.str-el2018★ 31 cited

Magneto-elastic induced vibronic bound state in the spin ice pyrochlore Ho $_{2}$ Ti $_{2}$ O $_{7}$

J. Gaudet, A. M. Hallas, C. R. C. Buhariwalla +6

The single ion physics of Ho $_{2}$ Ti $_{2}$ O $_{7}$ is well-understood to produce strong Ising anisotropy, which is an essential ingredient to its low-temperature spin ice state. We presen…

cond-mat.str-el2018★ 11 cited

Low-carrier density and fragile magnetism in a Kondo lattice system

Binod K. Rai, Iain W. H. Oswald, Wenjing Ban +17

Kondo-based semimetals and semiconductors are of extensive current interest as a viable platform for strongly correlated states. It is thus important to understand the routes towar…

cond-mat.str-el2018★ 18 cited

Anomalous metamagnetism in the low carrier density Kondo lattice YbRh3Si7

Binod K. Rai, S. Chikara, Xiaxin Ding +25

We report complex metamagnetic transitions in single crystals of the new low carrier Kondo antiferromagnet YbRh3Si7. Electrical transport, magnetization, and specific heat measurem…

cond-mat.str-el2018★ 1 cited

Low frequency spin dynamics in XY quantum spin ice Yb $_{2}$ Pt $_{2}$ O $_{7}$

S. K. Takahashi, A. Arsenault, C. Mauws +7

The XY pyrochlore Yb $_{2}$ Ti $_{2}$ O $_{7}$ , with pseudo spin 1/2 at the Yb $^{3 +}$ site, has been celebrated as potential host for the quantum spin ice state. The substitution of non-magne…

Geometric Approach to the High-Throughput Identification of Honeycomb Materials

Prominent Dimensional Effects on High-order Harmonic Generation in Strongly Correlated Electron Systems

Rare-earth oxysulfides RE2​O2​S as model mixed-anion frustrated magnets

K2​Co2​(TeO3​)3​ ⋅ 2.5 H2​O : A mineral-inspired pseudo-honeycomb cobalt dimer antiferromagnet

Vanishing ordered moment in the frustrated triangular lattice antiferromagnet CuNdO2​

Direct confirmation of long-range magnetic order and evidence for multipoles in Ce2​O3​

Neutron scattering study of the kagome metal Sc3Mn3Al7Si5

Absence of moment fragmentation in the mixed B-site pyrochlore Nd2​GaSbO7​

Frustrated Magnetism in Fluoride and Chalcogenide Pyrochlore Lattice Materials

Field-induced quantum critical point in the new itinerant antiferromagnet Ti3​Cu4​

The Future of the Correlated Electron Problem

Intertwined Magnetic Dipolar and Electric Quadrupolar Correlations in the Pyrochlore Tb2​Ge2​O7​

Quantum critical point in the itinerant ferromagnet Ni1−x​Rhx​

Complex Transport and Magnetism in Inhomogeneous Mixed Valence Ce3​Ir4​Ge13​

Intertwined magnetic, structural, and electronic transitions in V2​O3​

Kondo exhaustion and conductive surface states in antiferromagnetic YbIr3​Si7​

Coexistence of metallic and nonmetallic properties in the pyrochlore Lu2​Rh2​O7​

Probing the quantum phase transition in Mott insulator BaCoS_2 tuned by pressure and Ni-substitution

μSR study of spin freezing and persistent spin dynamics in NaCaNi2​F7​

Dipolar-Octupolar Ising Antiferromagnetism in Sm2​Ti2​O7​: A Moment Fragmentation Candidate

Magneto-elastic induced vibronic bound state in the spin ice pyrochlore Ho2​Ti2​O7​

Low-carrier density and fragile magnetism in a Kondo lattice system

Anomalous metamagnetism in the low carrier density Kondo lattice YbRh3Si7

Low frequency spin dynamics in XY quantum spin ice Yb2​Pt2​O7​

Rare-earth oxysulfides RE $_{2}$ O $_{2}$ S as model mixed-anion frustrated magnets

K $_{2}$ Co $_{2}$ (TeO $_{3}$ ) $_{3}$ $\cdot$ 2.5 H $_{2}$ O : A mineral-inspired pseudo-honeycomb cobalt dimer antiferromagnet

Vanishing ordered moment in the frustrated triangular lattice antiferromagnet CuNdO $_{2}$

Direct confirmation of long-range magnetic order and evidence for multipoles in Ce $_{2}$ O $_{3}$

Absence of moment fragmentation in the mixed $B$ -site pyrochlore Nd $_{2}$ GaSbO $_{7}$

Field-induced quantum critical point in the new itinerant antiferromagnet Ti $_{3}$ Cu $_{4}$

Intertwined Magnetic Dipolar and Electric Quadrupolar Correlations in the Pyrochlore Tb $_{2}$ Ge $_{2}$ O $_{7}$

Quantum critical point in the itinerant ferromagnet Ni $_{1 - x}$ Rh $_{x}$

Complex Transport and Magnetism in Inhomogeneous Mixed Valence Ce $_{3}$ Ir $_{4}$ Ge $_{13}$

Intertwined magnetic, structural, and electronic transitions in V $_{2}$ O $_{3}$

Kondo exhaustion and conductive surface states in antiferromagnetic YbIr $_{3}$ Si $_{7}$

Coexistence of metallic and nonmetallic properties in the pyrochlore Lu $_{2}$ Rh $_{2}$ O $_{7}$

$μ$ SR study of spin freezing and persistent spin dynamics in NaCaNi $_{2}$ F $_{7}$

Dipolar-Octupolar Ising Antiferromagnetism in Sm $_{2}$ Ti $_{2}$ O $_{7}$ : A Moment Fragmentation Candidate

Magneto-elastic induced vibronic bound state in the spin ice pyrochlore Ho $_{2}$ Ti $_{2}$ O $_{7}$

Low frequency spin dynamics in XY quantum spin ice Yb $_{2}$ Pt $_{2}$ O $_{7}$