Article
Materials Science, Multidisciplinary
A. A. Turrini, M. Ruminy, F. Bourdarot, U. Stuhr, J. S. White, G. Tucker, M. Skoulatos, M. Nunez-Valdez, T. Fennell
Summary: In the rare-earth pyrochlore Tb2Ti2O7, strong interactions between crystal field and phonon excitations result in hybridization, which may explain the avoidance of expected long-range ordered states. Magnetoelastic coupling mechanisms involve large quadrupolar matrix elements enabling coupling with intersecting phonons. Applying a magnetic field can modify the energies and suppress the magnetoelastic signal, driving the spin system closer to classically anticipated ordered structures.
Article
Materials Science, Multidisciplinary
SangEun Han, Adarsh S. Patri, Yong Baek Kim
Summary: This article introduces fractonic phases and a quantum model based on the breathing pyrochlore lattice, which have potential applications in quantum memory.
Article
Physics, Multidisciplinary
B. Santhosh Kumar, Rajesh Narayana Perumal, C. Venkateswaran
Summary: This study reports the ferroelectric property in Tb2Ti2O7 pyrochlore at 382K, which is attributed to the structural distortion in the TiO6 octahedron. Experimental results confirm the ferroelectricity in the material at high temperature, with a dielectric anomaly observed at 383K.
Article
Materials Science, Multidisciplinary
Md Salman Khan, Ilaria Carlomagno, Carlo Meneghini, P. K. Biswas, Fabrice Bert, Subham Majumdar, Sugata Ray
Summary: This article investigates the electronic, magnetic, and thermodynamic properties of a mixed-valent metallic pyrochlore iridate Pb2Ir2O7-delta under different temperatures and magnetic fields. It provides evidence of a non-Fermi liquid ground state.
Review
Physics, Multidisciplinary
Matteo Baggioli, Blaise Gouteraux
Summary: The Colloquium reviews recent progress in describing strongly correlated phases of matter with spontaneously broken translations, discussing the incorporation of disorder and pinning into the effective field theory. It also highlights the role of gauge-gravity duality models in establishing these field theories with approximate symmetries. Finally, it discusses the relevance of these models to the phenomenology of transport in strongly correlated materials.
REVIEWS OF MODERN PHYSICS
(2023)
Article
Computer Science, Information Systems
Hwigon Kim, Seon-Gu Kang, Jae-Jung Jung, Hyun-Sam Jung
Summary: Interior permanent magnet synchronous motors (IPMSMs) are widely used in electric vehicles. However, the Nd-Fe-B permanent magnets used in these motors are susceptible to temperature variations, which can affect motor characteristics. This paper compares two methods for estimating magnet temperature in low-speed and standstill conditions: the high-frequency resistance-based method and the high-frequency inductance-based method. The comparison showed that the high-frequency inductance-based method has a stronger correlation with magnet temperature in these conditions compared to the high-frequency resistance-based method.
Article
Multidisciplinary Sciences
Janusz E. Jacak
Summary: Using braid symmetry, we rigorously derive the Laughlin function for the main hierarchy 1/q of FQHE in a two-dimensional electron system, proving that its derivation requires topological elements and cannot be completed within local quantum mechanics. Additionally, we propose a generalization of this function to other fractions in the quantum Hall hierarchy.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
M. Klicpera, K. Vlaskova, D. Stasko, T. Guidi, I. Puente Orench, M. Divis
Summary: In this study, the newly synthesized Tm2Ir2O7 iridate was investigated using neutron scattering techniques. The researchers observed a specific crystal structure and thermal expansion properties, as well as magnetic excitations.
Article
Multidisciplinary Sciences
Jacek Cwik, Yurii Koshkidko, Konstantin Nenkov, Evgenia Tereshina-Chitrova, Malgorzata Malecka, Bruno Weise, Karolina Kowalska
Summary: This study examines the magnetocaloric efficiency of rare-earth Laves-phase compounds using Ho1-xErxNi2 as an example and illustrates their potential as components of magnetocaloric composites. The determined regularities in the system's behavior substantiate the possibility of achieving high magnetocaloric potentials in a desired temperature range.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Multidisciplinary
Nikita Astrakhantsev, Tom Westerhout, Apoorv Tiwari, Kenny Choo, Ao Chen, Mark H. Fischer, Giuseppe Carleo, Titus Neupert
Summary: An extensive numerical investigation was conducted to challenge the hypothesis of a spin-liquid ground state in the spin-1/2 Heisenberg model on the pyrochlore lattice. The results indicate a dimer order with broken inversion and rotational symmetry, questioning the scenario of a featureless quantum spin liquid. These findings showcase the potential of many-variable variational techniques in addressing challenging questions about three-dimensional frustrated quantum magnets.
Article
Materials Science, Multidisciplinary
Yuxin Chen, Yongjun Zhang, Rui Li, Hang Su, Zhaoyang Shan, Michael Smidman, Huiqiu Yuan
Summary: We investigated the magnetic order in single crystals of TbRh6Ge4 using electrical transport, magnetization, and thermodynamic measurements. TbRh6Ge4 has a noncentrosymmetric tetragonal LiCo6P4-type structure, with Tb ions forming a triangular lattice in the basal plane. The compound exhibits a second-order antiferromagnetic transition at TN = 12.7 K, followed by another transition at TM = 2.8 K. When a field is applied along the easy c axis, multiple metamagnetic transitions occur, with plateaus at 1/9 and 1/3 of the saturation magnetization. We constructed a field-temperature phase diagram, revealing complex magnetism and possible magnetic frustration within the basal plane.
Article
Materials Science, Multidisciplinary
Chunxiao Liu, Gabor B. Halasz, Leon Balents
Summary: Researchers explored the possibility of finding pyrochlore quantum spin liquids that go beyond the standard U(1) quantum spin liquid, resulting in the discovery of several classes of spin liquids that preserve symmetry. Through a simple model, they investigated the low temperature properties of these spin liquids.
Article
Physics, Multidisciplinary
Chiara Marletto, Vlatko Vedral
Summary: This study discusses the implications of the principle of locality for interference in quantum field theory and proposes that detecting relative phases or entanglement in interference experiments can access the gauge degrees of freedom associated with ghost (scalar) modes of the field. These results suggest that ghost modes are measurable and raise questions about the relationship between the principle of locality and gauge invariance. The analysis also extends to linearized quantum gravity in the harmonic gauge and has implications for entanglement-based witnesses of non-classicality in gravity.
ANNALEN DER PHYSIK
(2023)
Article
Materials Science, Multidisciplinary
A. Scheie, M. Sanders, Xin Gui, Yiming Qiu, T. R. Prisk, R. J. Cava, C. Broholm
Summary: The study presents the low-temperature magnetic properties of Nd2ScNbO7, including susceptibility, magnetization, elastic and inelastic neutron scattering. The findings indicate a unique fluctuating magnetic ground state that resembles a spin liquid but may have other underlying mechanisms. The presence of static electronic moments and suppression of nuclear Schottky anomaly suggest complex magnetic interactions influenced by disorder.
Article
Computer Science, Information Systems
Yunyan Xia, Sijia Lv, Bo Jing, Zhou Zhou
Summary: A study was conducted on a 160kW and 60r/min low speed and high torque permanent-magnet synchronous motor. A motor temperature field calculation model was established based on fluid mechanics and heat transfer theories, and the motor fluid field and temperature field were solved using the finite volume method. The steady-state temperature distribution of the motor was obtained. Additionally, a cooling wind thorn was added to the end face of the rotor core to address the high temperature rise issue of the permanent magnet. Simulation was used to analyze the effects of the geometric parameters of the cooling wind thorn on the fluid field and temperature field, and the optimal size of the wind thorn was determined for the best thermal performance. The use of thermal conductive adhesive between the motor shell and the end of the winding was found to reduce the winding temperature rise, which was the highest at the end of the stator winding. Simulation was also used to analyze the effects of different sealing solutions and thermal-conductivity adhesives on motor heat transfer.
