Article
Materials Science, Multidisciplinary
Li Ern Chern, Yong Baek Kim, Claudio Castelnovo
Summary: Using projective symmetry group analysis, we classified the quantum spin liquids on a S=1/2 pyrochlore magnet with breathing anisotropy. We identified different Z2 and U(1) spin liquids that respect the space group F 4 over bar 3m and time reversal symmetry. By studying the U(1) spin liquids, we found that only two of them were physically relevant for the antiferromagnetic Heisenberg model. We provided analytical solutions to the parton mean field theory for these two U(1) spin liquids and revealed their properties regarding gapless and gapped spinon excitations. The two U(1) spin liquids were found to be energetically equivalent and could be differentiated by their low-temperature heat capacity contribution. We also showed that fluctuations of the U(1) gauge field did not affect one of the spin liquids within the random phase approximation. Finally, we demonstrated that a small Dzyaloshinskii-Moriya interaction could break the degeneracy between the two U(1) spin liquids.
Article
Materials Science, Multidisciplinary
O. Brunn, Y. Perrin, B. Canals, N. Rougemaille
Summary: The analysis of the magnetic structure factor from a field-demagnetized artificial square ice reveals deviations from the six-vertex model, with additional features observed in the experimental data compared to the theoretical one. Monte Carlo simulations show that these features originate from dipolarlike, farther neighbor couplings, indicating the importance of long-range magnetostatic interactions in the magnetic correlations of artificial square ice systems. Ultimately, these systems are expected to order if the ground state can be approached.
Article
Multidisciplinary Sciences
Andrew D. King, Cristiano Nisoli, Edward D. Dahl, Gabriel Poulin-Lamarre, Alejandro Lopez-Bezanilla
Summary: Artificial spin ices are frustrated spin systems that can be engineered to allow the design and characterization of exotic emergent phenomena. In this study, a realization of spin ice in a lattice of superconducting qubits was reported, showing control over a fragile degeneracy point and the demonstration of Gauss's law for emergent effective monopoles in two dimensions. This qubit control paves the way for potential future study of topologically protected artificial quantum spin liquids.
Article
Physics, Multidisciplinary
Michael Saccone, Arjen van den Berg, Edward Harding, Shobhna Singh, Sean R. Giblin, Felix Flicker, Sam Ladak
Summary: Artificial spin-ice materials are frustrated arrays of single-domain nanomagnetic islands, studied in both two-dimensions and three-dimensions. Through simulations and experiments, it is discovered that three-dimensional artificial spin-ice systems host various magnetic charge-ordered states. In the experimental demagnetised systems, ferromagnetic stripes are observed on the surface, inhibiting the formation of the lower energy double-charged monopole crystal.
COMMUNICATIONS PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
A. Samartzis, J. Xu, V. K. Anand, A. T. M. N. Islam, J. Ollivier, Y. Su, B. Lake
Summary: The moment in Nd2Hf2O7 forms a static long-range ordered ground state, a flat, gapped pinch point excitation, and dispersive excitations. These results confirm recent theories predicting that dispersive modes give rise to their own pinch point patterns, observed as half-moons experimentally.
Article
Physics, Multidisciplinary
Attila Szabo, Fabio Orlandi, Pascal Manuel
Summary: We study the near-neighbor and dipolar Ising models on a lattice of corner-sharing octahedra. The frustration between antiferromagnetism and a spin-ice-like three-in-three-out rule leads to a Coulomb phase with correlated dipolar and quadrupolar spin textures, showing distinct neutron-scattering signatures. Strong further-neighbor perturbations result in independent ordering of the two components, leading to unusual multi-k orders. We propose experimental realizations of our model in rare-earth antiperovskites.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
L. Pili, A. Steppke, M. E. Barber, F. Jerzembeck, C. W. Hicks, P. C. Guruciaga, D. Prabhakaran, R. Moessner, A. P. Mackenzie, S. A. Grigera, R. A. Borzi
Summary: This study investigates the metamagnetic transitions in topological metamagnets, finding a single transition line for two materials with different magnetic interactions. The transitions exhibit distinct magnetization characteristics and sensitivity to changes in the material's stress environment.
Article
Physics, Applied
Peter Schiffer, Cristiano Nisoli
Summary: Artificial spin ice systems are arrays of interacting nanoscale magnetic moments with collective behavior, designed based on chosen array geometry. Research in artificial spin ice has expanded beyond the original focus, now encompassing structures exhibiting a wider range of physical phenomena.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Yue Li, Frank Barrows, Arthur R. C. McCray, Timothy Cote, David Friedman, Ralu N. S. Divan, Amanda K. Petford-Long, Charudatta Phatak
Summary: Artificial spin ices composed of coupled nanomagnets offer the possibility to create designer geometrical frustration and manipulate inter-nanomagnet interactions. In this study, a dimer kagome artificial spin ice system was created and the antiferromagnetic order was controlled by tuning lattice geometry. Monte Carlo simulations were used to analyze the behavior of the system and different antiferromagnetic phases and interactions were visualized in demagnetized lattices with different lattice parameters.
CELL REPORTS PHYSICAL SCIENCE
(2022)
Article
Physics, Multidisciplinary
M. Alfonso-Moro, V. Guisset, P. David, B. Canals, J. Coraux, N. Rougemaille
Summary: Under certain experimental conditions, C60 molecules form corrugated islands on a copper surface, exhibiting a pattern similar to highly frustrated magnets. Statistical analysis reveals that the C60/Cu system demonstrates the characteristics of a triangular Ising antiferromagnet.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Chloe S. Coates, Mia Baise, Adrian Schmutzler, Arkadiy Simonov, Joshua W. Makepeace, Andrew G. Seel, Ronald Smith, Helen Y. Playford, David A. Keen, Renee Siegel, Jurgen Senker, Ben Slater, Andrew L. Goodwin
Summary: Spin-ices are frustrated magnets that exhibit emergent physics at low temperatures, typically around 1-5K. However, non-magnetic cadmium cyanide (Cd(CN)2) shows similar behavior to magnetic spin-ices at a much higher temperature scale, with electric dipole moments of cyanide ions playing the role of magnetic pseudospins. This demonstrates that spin-ice physics can be observed in systems of frustrated electric dipoles, even at room temperature.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
D. Slobinsky, L. Pili, G. Baglietto, S. A. Grigera, R. A. Borzi
Summary: The study introduces the magnetoelastic spin ice model to describe the double-layered monopole crystal observed on a pyrochlore oxide lattice, and proposes the dipolar electric moment of single monopoles as a probe for magnetism. Results show that some Coulomb phases could potentially be detected through pinch points associated with O-2 ion displacements.
COMMUNICATIONS PHYSICS
(2021)
Article
Chemistry, Physical
Sabri Koraltan, Florian Slanovc, Florian Bruckner, Cristiano Nisoli, Andrii V. Chumak, Oleksandr V. Dobrovolskiy, Claas Abert, Dieter Suess
Summary: 3D nano-architectures present a new paradigm in modern condensed matter physics with applications in photonics, biomedicine, and spintronics. Research shows that in highly frustrated 3D artificial spin ice, the mobility threshold for magnetic charges is lower than their unbinding energy, and by applying global magnetic fields, magnetic charges can be steered in a given direction.
NPJ COMPUTATIONAL MATERIALS
(2021)
Article
Physics, Multidisciplinary
Huner Fanchiotti, Carlos A. Garcia Canal, Marco Traini, Vicente Vento
Summary: This study focuses on the electromagnetic properties of particles with magnetic moment and no charge, examining their behavior when passing through coils and solenoids. By applying the Faraday-Lenz law, the resulting current and its energy are calculated. The analysis covers both long-lived almost stable particles and those with a finite lifetime. The obtained results are then utilized to investigate the excited states of monopolium, a bound state of a monopole and an antimonopole.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Multidisciplinary Sciences
Jack C. Gartside, Alex Vanstone, Troy Dion, Kilian D. Stenning, Daan M. Arroo, Hidekazu Kurebayashi, Will R. Branford
Summary: This article presents a scheme for modifying square artificial spin ice to prepare any ordered vertex state through simple global-field protocols, resulting in rich and distinct microstate-specific magnon spectra. Microstate control allows fine mode-frequency shifting, gap creation and closing, and active mode number selection.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
G. Sala, M. B. Stone, Binod K. Rai, A. F. May, Pontus Laurell, V. O. Garlea, N. P. Butch, M. D. Lumsden, G. Ehlers, G. Pokharel, A. Podlesnyak, D. Mandrus, D. S. Parker, S. Okamoto, Gabor B. Halasz, A. D. Christianson
Summary: Researchers utilized inelastic neutron scattering to investigate the spin correlations of the honeycomb lattice quantum magnet YbCl3, identifying key features such as the Van Hove singularity. The results confirm widely held notions about quantum magnetism continua and establish YbCl3 as a benchmark material for quantum magnetism on the honeycomb lattice.
NATURE COMMUNICATIONS
(2021)
Article
Nuclear Science & Technology
Iyad I. Al-Qasir, Yongqiang Cheng, Jiao Y. Y. Lin, Anne A. Campbell, G. Sala, Kemal Ramic, Fahima F. Islam, Abdallah Qteish, Barry Marsden, Douglas L. Abernathy, Matthew B. Stone
Summary: This study focuses on the thermal neutron scattering of two types of nuclear graphite with different microstructures, demonstrating excellent agreement between experimental and computational results, and significant improvement in the calculated scattering functions and cross-sections.
ANNALS OF NUCLEAR ENERGY
(2021)
Article
Physics, Multidisciplinary
Naoka Hiraoka, Kelton Whiteaker, Marian Blankenhorn, Yoshiyuki Hayashi, Ryosuke Oka, Hidenori Takagi, Kentaro Kitagawa
Summary: A highly sensitive magnetometry technique has been developed for measurements under high pressures using an opposed-anvil type cell and linear algebra methods, significantly improving the sample-signal-to-background ratio.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2021)
Article
Materials Science, Multidisciplinary
Yuto Ishii, G. Sala, M. B. Stone, V. O. Garlea, S. Calder, Jie Chen, Hiroyuki K. Yoshida, Shuhei Fukuoka, Jiaqiang Yan, Clarina dela Cruz, Mao-Hua Du, David S. Parker, Hao Zhang, Cristian D. Batista, Kazunari Yamaura, A. D. Christianson
Summary: The physical properties of the Shastry-Sutherland lattice material BaNd2ZnO5 were investigated, revealing antiferromagnetic order below 1.65 K with a 2-Q magnetic structure. The ordered moment for this structure is 1.9(1) mu(B) per Nd ion, and the ground state doublet indicates that the magnetic moments lie primarily in the basal plane. Through refinement of models with LS coupling and intermediate coupling approximations, the crystal field Hamiltonian was determined.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Instruments & Instrumentation
Jiao Y. Y. Lin, Gabriele Sala, Matthew B. Stone
Summary: This article reports the application of real-space techniques in optical imagery to obtain reciprocal-space super resolution dispersion for phonon or magnetic excitations from single-crystal neutron spectroscopy measurements. By accurately determining the momentum and energy-dependent point spread function and using a dispersion correction technique inspired by stereo imaging, the reconstruction of super-resolution energy dispersion of excitations has been achieved.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Instruments & Instrumentation
G. Sala, M. Mourigal, C. Boone, N. P. Butch, A. D. Christianson, O. Delaire, A. J. DeSantis, C. L. Hart, R. P. Hermann, T. Huegle, D. N. Kent, J. Y. Y. Lin, M. D. Lumsden, M. E. Manley, D. G. Quirinale, M. B. Stone, Y. Z
Summary: CHESS is a neutron chopper spectrometer designed to detect and analyze weak signals intrinsic to small cross sections in powders, liquids, and crystals. It is optimized for studying quantum materials, spin liquids, thermoelectrics, battery materials, and liquids. The instrument has a broad dynamic range and enhanced capability for polarization analysis.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Physics, Multidisciplinary
A. Scheie, O. Benton, M. Taillefumier, L. D. C. Jaubert, G. Sala, N. Jalarvo, S. M. Koohpayeh, N. Shannon
Summary: In this study, the dynamical properties of Yb2Ti2O7 are explored using inelastic neutron scattering. It is found that spin correlations exhibit dynamic scaling behavior, similar to that found near a quantum critical point. The observed scaling collapse is explained within a phenomenological theory of multiple-phase competition, and is also confirmed in semiclassical simulations of a microscopic model of Yb2Ti2O7.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Condensed Matter
G. Sala, Matthew B. Stone, Seung-Hwan Do, Keith M. Taddei, Qiang Zhang, Gabor B. Halasz, M. D. Lumsden, Andrew F. May, Andrew D. Christianson
Summary: In this study, the physical properties of YbBO3 were investigated using neutron diffraction, inelastic neutron scattering, specific heat, and ac susceptibility measurements. The results showed that YbBO3 crystallizes in the monoclinic space group C2/c (#15) with a slightly distorted triangular lattice. The measurements indicated a potential transition to magnetic order at 0.4 K with the presence of magnetic Bragg peaks and ordered moments on both Yb sites. The study also revealed shorter ranged spin correlations and multiple crystal field excitations in YbBO3.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Christopher M. Pasco, Binod K. Rai, Matthias Frontzek, Gabriele Sala, Matthew B. Stone, Bryan C. Chakoumakos, V. Ovidiu Garlea, Andrew D. Christianson, Andrew F. May
Summary: Single crystals of BaNd2PtO5 were grown and characterized to investigate its physical properties and magnetic ground state as a candidate for the Shastry-Sutherland model. It was found to have an antiferromagnetic transition at TN = 1.9 K and a large magnetic anisotropy. The magnetic ground state was determined to be a fully compensated antiferromagnet with a propagation vector of (1/2 1/2 1/2).
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
J. Gaudet, H. -y. Yang, E. M. Smith, T. Halloran, J. P. Clancy, J. A. Rodriguez-Rivera, Guangyong Xu, Y. Zhao, W. C. Chen, G. Sala, A. A. Aczel, B. D. Gaulin, F. Taft, C. Broholm
Summary: The magnetism of a rocksalt fcc rare-earth monopnictide HoBi, a topological material candidate with extreme magnetoresistance, is studied. The cubic crystal electric field of the Ho3+ non-Kramers J = 8 spin-orbital multiplet results in six nearly degenerate low-energy levels, forming an anisotropic magnetic moment coupled to the lattice. The paramagnetic neutron scattering in the cubic phase for T > TN = 5.72(1) K indicates dominant antiferromagnetic interactions between 2 2 Ho spins separated by {100} and ferromagnetic interactions between spins displaced by { 1 20}, while a type-II AFM long-range order with k = (1 1 2) and tetragonal lattice distortion develops for T < TN.
Article
Materials Science, Multidisciplinary
Seung-Hwan Do, Joseph A. M. Paddison, Gabriele Sala, Travis J. Williams, Koji Kaneko, Keitaro Kuwahara, Andrew F. May, Jiaqiang Yan, Michael A. McGuire, Matthew B. Stone, Mark D. Lumsden, Andrew D. Christianson
Summary: This article introduces a critical step in determining and explaining the presence of a gap at a magnon crossing point to characterize the topological properties of a material. Through neutron scattering measurements of CrCl3, the study finds that the scattering intensity near the crossing point is highly sensitive to experimental conditions, affecting the apparent topological gap size. The study provides an explanation for discrepancies between spectroscopic and first-principles estimates of gap sizes and offers guidelines for accurately measuring topological magnon gaps.
Article
Materials Science, Multidisciplinary
G. Sala, J. Y. Y. Lin, A. M. Samarakoon, D. S. Parker, A. F. May, M. B. Stone
Summary: A detailed analysis of the ferrimagnetic ground state of Mn3Si2Te6 using inelastic neutron scattering has been conducted in this study. The study reveals the existence of exchange anisotropy in Mn3Si2Te6, indicating a weak spin-orbit coupling in the material. The research employs a detailed simulation of the spin-wave spectrum and traditional refinement techniques, along with Monte Carlo simulations, to accurately determine the exchange couplings. The results are independently validated through a comparison with heat capacity measurements.
Article
Materials Science, Multidisciplinary
Lise Orduk Sandberg, Richard Edberg, Ingrid-Marie Berg Bakke, Kasper S. Pedersen, Monica Ciomaga Hatnean, Geetha Balakrishnan, Lucile Mangin-Thro, Andrew Wildes, B. Fak, Georg Ehlers, Gabriele Sala, Patrik Henelius, Kim Lefmann, Pascale P. Deen
Summary: Neutron scattering, magnetic susceptibility, and theoretical analysis were used to confirm the short-range nature of the magnetic structure and spin-spin correlations in a Yb3Ga5O12 single crystal. The quantum spin state of Yb3+ in Yb3Ga5O12 was verified, with the quantum spins organizing into a short-ranged emergent director state. The magnitude of the near-neighbor exchange interactions and dipolar exchange interactions were derived, providing a basis for understanding the complex Hamiltonian needed to fully describe the magnetic state of Yb3Ga5O12.
Article
Materials Science, Multidisciplinary
Xiaojian Bai, Randy S. Fishman, Gabriele Sala, Daniel M. Pajerowski, V. Ovidiu Garlea, Tao Hong, Minseong Lee, Jaime A. Fernandez-Baca, Huibo Cao, Wei Tian
Summary: This study reports a detailed analysis of the inelastic neutron scattering data on the hybrid molecule-based multiferroic compound (ND4)2FeCl5·D2O, revealing a transition in the underlying multiferroic mechanism between different phases. The spin dynamics of both phases can be accurately described by a Heisenberg Hamiltonian with easy-plane anisotropy, indicating robust magnetic interactions compared to electric polarization. The balance of exchange couplings and frustrated interactions between the phases remains consistent, suggesting stability in the magnetic interactions of (ND4)2FeCl5·D2O.
Article
Materials Science, Multidisciplinary
Binod K. Rai, Ganesh Pokharel, Hasitha Suriya Arachchige, Seung-Hwan Do, Qiang Zhang, Masaaki Matsuda, Matthias Frontzek, Gabriele Sala, V. Ovidiu Garlea, Andrew D. Christianson, Andrew F. May
Summary: This study investigates the anisotropic magnetism in NdCoGe3 and reveals the complex magnetic order derived from modulated magnetic moments through thermodynamic and neutron diffraction measurements. The material hosts multiple magnetic phases, and the magnetic structures exhibit incommensurate properties with a unique propagation vector.
