The origin of magnetism in metals has been traditionally discussed in two diametrically opposite limits: itinerant and local moments. Surprisingly, there are very few known examples of materials that are close to the itinerant limit, and their properties are not universally understood. In the case of the two such examples discovered several decades ago, the itinerant ferromagnets ZrZn2 and Sc3In, the understanding of their magnetic ground states draws on the existence of 3d electrons subject to strong spin fluctuations. Similarly, in Cr, an elemental itinerant antiferromagnet with a spin density wave ground state, its 3d electron character has been deemed crucial to it being magnetic. Here, we report evidence for an itinerant antiferromagnetic metal with no magnetic constituents: TiAu. Antiferromagnetic order occurs below a Néel temperature of 36 K, about an order of magnitude smaller than in Cr, rendering the spin fluctuations in TiAu more important at low temperatures. This itinerant antiferromagnet challenges the currently limited understanding of weak itinerant antiferromagnetism, while providing insights into the effects of spin fluctuations in itinerant-electron systems.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4510670 | PMC |
| http://dx.doi.org/10.1038/ncomms8701 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Connection between -electron correlations and magnetic excitations in UTe.
NPJ Quantum Mater
January 2025
NIST Center for Neutron Research, Gaithersburg, MD 20899 USA.
The detailed anisotropic dispersion of the low-temperature, low-energy magnetic excitations of the candidate spin-triplet superconductor UTe is revealed using inelastic neutron scattering. The magnetic excitations emerge from the Brillouin zone boundary at the high symmetry and points and disperse along the crystallographic -axis. In applied magnetic fields to at least = 11 T along the , the magnetism is found to be field-independent in the ( 0) plane.
View Article and Find Full Text PDFLocal correlations necessitate waterfalls as a connection between quasiparticle band and developing Hubbard bands.
Nat Commun
January 2025
Institute of Solid State Physics, TU Wien, 1040, Vienna, Austria.
Waterfalls are anomalies in the angle-resolved photoemission spectrum where the energy-momentum dispersion is almost vertical, and the spectrum strongly smeared out. These anomalies are observed at relatively high energies, among others, in superconducting cuprates and nickelates. The prevalent understanding is that they originate from the coupling to some boson, with spin fluctuations and phonons being the usual suspects.
View Article and Find Full Text PDFPhase evolutions of sodium layered oxide cathodes during thermal fluctuations.
Chem Commun (Camb)
January 2025
College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China.
Layered transition metal oxide (NaTMO) cathodes are considered highly appropriate for the practical applications of sodium-ion batteries (SIBs) owing to their facile synthesis and high theoretical capacity. Generally, the phase evolution behaviors of NaTMO during solid-state reactions at high temperature closely related to their carbon footprint, prime cost, and the eventual electrochemical properties, while the thermal stability in various desodiated states associated with wide temperature fluctuations are extremely prominent to the electrochemical properties and safety of SIB devices. Therefore, in this review, the influences of sintering conditions such as pyrolysis temperature, soaking time, and cooling rates on the phase formation patterns of NaTMO are summarized.
View Article and Find Full Text PDFFormation of individual stripes in a mixed-dimensional cold-atom Fermi-Hubbard system.
Nature
January 2025
Max-Planck-Institut für Quantenoptik, Garching, Germany.
Article Synopsis
- The study explores the connection between d-wave superconductivity and stripe phases in high-temperature cuprate superconductors, revealing how anisotropic couplings can enhance critical temperatures.
- Recent advancements in quantum simulators using ultracold atoms allow for the experimentation and observation of these phenomena in real-time at a detailed level.
- The research presents evidence of stripe formation in a cold-atom Fermi-Hubbard simulator, showing attractive correlations between dopants and suggesting the presence of a precursor to the stripe phase, which involves complex charge and spin ordering.
Uncommon Magnetic Ordering in the Quantum Magnet Yb_{3}Ga_{5}O_{12}.
Phys Rev Lett
December 2024
Université Grenoble Alpes, Grenoble INP, CEA, IRIG, PHELIQS, 38000 Grenoble, France.
The antiferromagnetic structure of Yb_{3}Ga_{5}O_{12} is identified by neutron diffraction experiments below the previously known transition at T_{λ}=54 mK. The magnetic propagation vector is found to be k=(1/2,1/2,0), an unusual wave vector in the garnet structure. The associated complex magnetic structure highlights the role of exchange interactions in a nearly isotropic system dominated by dipolar interactions and finds echoes with exotic structures theoretically proposed.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!