Comparison between Josephson Arbitrary Waveform Synthesizers Using a Cross-Correlation Technique

SSRN Electronic Journal · 2025-01-01

Non-stoichiometric weak magnetic doping effect on the magnetic transition and magnetocaloric properties in HoCo2V system

Journal of Alloys and Compounds · 2025-03-23 · 3 citations

Large asymmetric anomalous Nernst effect in the antiferromagnet SrIr0.8Sn0.2O3

Nature Communications · 2025-03-25 · 5 citations

A large anomalous Nernst effect is essential for thermoelectric energy-harvesting in the transverse geometry without external magnetic field. It’s often connected with anomalous Hall effect, especially when electronic Berry curvature is believed to be the driving force. This approach implicitly assumes the same symmetry for the Nernst and Hall coefficients, which is however not necessarily true. Here we report a large anomalous Nernst effect in antiferromagnetic SrIr0.8Sn0.2O3 that defies the antisymmetric constraint on the anomalous Hall effect imposed by the Onsager reciprocal relation. The observed spontaneous Nernst thermopower quickly reaches the sub-μV/K level below the Néel transition around 250 K, which is comparable with many topological antiferromagnetic semimetals and far excels other magnetic oxides. Our analysis indicates that the coexistence of significant symmetric and antisymmetric contributions plays a key role, pointing to the importance of extracting both contributions and a new pathway to enhanced anomalous Nernst effect for transverse thermoelectrics. To find materials with large anomalous Nernst coefficients, which is useful for energy harvesting, it is common to focus on materials with large anomalous Hall coefficients. Here, Gong et al. find a material where the anomalous Nernst effect does not show the same antisymmetric behaviour as the anomalous Hall effect.

Space Dentistry Combined With Remote and AI Technologies, a Necessity for Long‐Term Stays: Thoughts of US Astronauts' Unexpected Stay

Oral Diseases · 2025-08-16

Enhancing 1.43 μm emission of Tm3+ ions by co-doing Pr3+ ions in CNGG crystals grown by the micro-pulling-down method

Optical Materials · 2025-03-01

Strain-Tunable Anomalous Hall Plateau in Antiferromagnet CoNb ₃ S ₆

Nano Letters · 2025-11-23

Antiferromagnets with anomalous Hall effects offer a compelling link among magnetism, topology, and electronic structure. Identifying antiferromagnets with large and tunable anomalous Hall effects is crucial for the development of spintronic applications. We report a strain-tunable anomalous Hall plateau in CoNb3S6, a layered antiferromagnet known for its unexpectedly large anomalous Hall conductivity. The plateau emerges as a flat, extended intermediate step in the Hall hysteresis loop with the step height tunable by temperature and strain. Unlike typical magnetic plateaus tied to metastable states, this behavior suggests a hidden phase transition that alters magnetic anisotropy without changing the magnetic order. Symmetry analysis suggests that the hidden phase preserves the rotational symmetry of the ab plane. The plateau reflects phase coexistence during the hidden transition and exhibits non-volatile anomalous Hall resistivity, enabling a novel four-state Hall switching.

Strain-tunable anomalous Hall plateau in antiferromagnet CoNb$_3$S$_6$

ArXiv.org · 2025-03-20

Antiferromagnets exhibiting the anomalous Hall effect represent a fascinating convergence of magnetism, topology, and electronic structure. Identifying antiferromagnets with large and tunable anomalous Hall effects is crucial for the development of spintronic applications. Here, we report a strain-tunable anomalous Hall plateau in CoNb$_3$S$_6$, which is a prime candidate for altermagnetism. The plateau emerges as a flat extended intermediate step of the anomalous Hall hysteresis loop with a controllable step height with temperature and strain. The remarkable tunability of the plateau position is in contrast with typical magnetic plateau associated with a field-induced metastable magnetic structure, but indicates the existence of a hidden phase transition that significantly alters the magnetic anisotropy energy without changing the magnetic order. The symmetry analysis of the strain tuning suggests that the hidden phase preserves the rotational symmetry of the ab-plane. Our results show the plateau reflects the phase coexistence during the hidden transition, and anomalous Hall resistivity of the plateau is thus non-volatile, enabling a novel four-state switching of the anomalous Hall effect.

An Allele of <i>Glutamate Formiminotransferase</i> Triggers 5‐Methyl‐Tetrahydrofolate‐to‐MeFox Conversion and Facilitates Folate Biofortification in Maize

Advanced Science · 2025-08-21 · 1 citations

Identifying genes involved in folate accumulation is critical for elucidating the regulatory mechanisms of folate metabolism and breeding folate-rich crops. Here, a natural A-to-G variation at the 682nd bp is identified in the coding sequence of an identified plant gene glutamate formiminotransferase (GFT) in maize, leading to a glycine-to-asparagine substitution at the 228th in the protein sequence and contributing to the variation of folate accumulation in mature seeds of a maize inbred line population. This gene encodes a protein highly similar to the formiminotransferase domain of mammalian formiminotransferase cyclodeaminase. In vitro biochemical analysis of this protein reveals an activity of triggering 5-methyl-tetrahydrofolate (5-M-THF)-to-MeFox conversion, other than exerting an activity of formiminotransferase in mammals. Loss of ZmGFT function triples 5-M-THF levels, and overexpression of G-allele-carrying ZmGFT boosts the metabolic flow toward MeFox. Functional conservation of GFT is validated in rice and Arabidopsis. The asparagine-to-glycine substitution enhances 5-M-THF-to-MeFox conversion, as demonstrated by in vitro assays and in silico analyses. The functional characterization of the GFT gene has uncovered a new metabolic fate of 5-M-THF, apart from a C1 donor for methionine synthesis, in plants, and a distinct activity from its mammalian ortholog. The natural variation identified is useful for breeding folate-fortified maize varieties.

Enhancing Anomalous Hall Effect with Suppressed Ferromagnetism in the SrTiO3-Confined Bilayer Heterostructure of Ultrathin SrRuO3 and SrIrO3

SSRN Electronic Journal · 2025-01-01

Probing Ice-Rule-Breaking Transition in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>Dy</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> </mml:mrow> <mml:msub> <mml:mrow> <mml:mtext>Ti</mml:mtext> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> <mml:msub> <mml:mrow> <mml:mi mathvariant="normal">O</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>7</mml:mn> </mml:mrow> </mml:msub> </mml:mrow> </mml:math> Thin Film by Proximitized Transport and Magnetic Torque

Physical Review Letters · 2025-11-17

While the spin-ice state of bulk pyrochlores such as Dy_{2}Ti_{2}O_{7} and Ho_{2}Ti_{2}O_{7} has been extensively studied in the past several decades due to its unique degenerate ground state and emergent monopole excitation, whether it survives in the thin-film form remains a mystery. The limited volume of the thin-film sample makes it challenging to study the intrinsic magnetic properties. Here, we synthesized 18-nm-thick Dy_{2}Ti_{2}O_{7} thin film on yttria-stabilized zirconia with 9.5 mol% Y_{2}O_{3} substrate and capped it by a thin conductive Bi_{2}Ir_{2}O_{7} layer and performed the proximitized magnetoresistance measurements. Our Letter found that the ice-rule-breaking phase transition survives but with a modified effective nearest-neighbor interaction (J_{eff}=1.054 K) and distorted Ising spin axes (ε=+0.051) compared to the bulk crystal. The results are supported by the simultaneously measured capacitive torque magnetometry. Our Letter demonstrates that proximitized transport is an effective tool for thin films of insulating frustrated magnets.