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- Title
Field-induced quantum critical point in the itinerant antiferromagnet Ti<sub>3</sub>Cu<sub>4</sub>.
- Authors
Moya, Jaime M.; Hallas, Alannah M.; Loganathan, Vaideesh; Huang, C.-L.; Kish, Lazar L.; Aczel, Adam A.; Beare, J.; Cai, Y.; Luke, G. M.; Weickert, Franziska; Nevidomskyy, Andriy H.; Malliakas, Christos D.; Kanatzidis, Mercouri G.; Lei, Shiming; Bayliff, Kyle; Morosan, E.
- Abstract
New phases of matter emerge at the edge of magnetic instabilities, which can occur in materials with moments that are localized, itinerant or intermediate between these extremes. In local moment systems, such as heavy fermions, the magnetism can be tuned towards a zero-temperature transition at a quantum critical point (QCP) via pressure, chemical doping, and, rarely, magnetic field. By contrast, in itinerant moment systems, QCPs are more rare, and they are induced by pressure or doping; there are no known examples of field induced transitions. This means that no universal behaviour has been established across the whole itinerant-to-local moment range—a substantial gap in our knowledge of quantum criticality. Here we report an itinerant antiferromagnet, Ti3Cu4, that can be tuned to a QCP by a small magnetic field. We see signatures of quantum criticality and the associated non-Fermi liquid behaviour in thermodynamic and transport measurements, while band structure calculations point to an orbital-selective, spin density wave ground state, a consequence of the square net structural motif in Ti3Cu4. Ti3Cu4 thus provides a platform for the comparison and generalisation of quantum critical behaviour across the whole spectrum of magnetism. Quantum criticality, a process driven by non-thermal parameters such as magnetic field, doping or pressure, when combined with magnetism and electron correlations, can give rise to quantum phase transitions and novel physics. Here, the authors present experimental evidence for itinerant antiferromagnetism in Ti3Cu4, as well as evidence of a magnetic field-induced quantum critical point.
- Subjects
CRITICAL point (Thermodynamics); QUANTUM phase transitions; MAGNETIC traps; ELECTRON configuration; MAGNETIC fields
- Publication
Communications Physics, 2022, Vol 5, Issue 1, p1
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-022-00901-7