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Title: Competing magnetic instabilities in the weak itinerant antiferromagnetic TiAu

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 20; Related Information: CHORUS Timestamp: 2017-05-16 22:11:27; Journal ID: ISSN 2469-9950
American Physical Society
Country of Publication:
United States

Citation Formats

Goh, Wen Fong, and Pickett, Warren E. Competing magnetic instabilities in the weak itinerant antiferromagnetic TiAu. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.205124.
Goh, Wen Fong, & Pickett, Warren E. Competing magnetic instabilities in the weak itinerant antiferromagnetic TiAu. United States. doi:10.1103/PhysRevB.95.205124.
Goh, Wen Fong, and Pickett, Warren E. Tue . "Competing magnetic instabilities in the weak itinerant antiferromagnetic TiAu". United States. doi:10.1103/PhysRevB.95.205124.
title = {Competing magnetic instabilities in the weak itinerant antiferromagnetic TiAu},
author = {Goh, Wen Fong and Pickett, Warren E.},
abstractNote = {},
doi = {10.1103/PhysRevB.95.205124},
journal = {Physical Review B},
number = 20,
volume = 95,
place = {United States},
year = {Tue May 16 00:00:00 EDT 2017},
month = {Tue May 16 00:00:00 EDT 2017}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevB.95.205124

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Cited by: 1work
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  • Cited by 2
  • Here, we report the pressure dependence of the Néel temperature T N up to P ≈ 27 GPa for the recently discovered itinerant antiferromagnet (IAFM) TiAu. The T N(P) phase boundary exhibits unconventional behavior in which the Néel temperature is enhanced from T N ≈ 33 K at ambient pressure to a maximum of T N ≈ 35 K occurring at P ≈ 5.5 GPa. Upon a further increase in pressure, T N is monotonically suppressed to ~22 K at P ≈ 27 GPa. We also find a crossover in the temperature dependence of the electrical resistivity ρ in themore » antiferromagnetic (AFM) phase that is coincident with the peak in T N(P), such that the temperature dependence of ρ = ρ 0 + A nT n changes from n≈3 during the enhancement of T N to n ≈ 2 during the suppression of T N. Based on an extrapolation of the T N(P) data to a possible pressure-induced quantum critical point, we estimate the critical pressure to be P c ≈ 45 GPa.« less
    Cited by 2
  • Cited by 1
  • Neutron scattering measurements of the magnetic excitations in single crystals of antiferromagnetic CaFe{sub 2}As{sub 2} reveal steeply dispersive and well-defined spin waves up to an energy of {approx}100 meV. Magnetic excitations above 100 meV and up to the maximum energy of 200 meV are however broader in energy and momentum than the experimental resolution. While the low energy modes can be fit to a Heisenberg model, the total spectrum cannot be described as arising from excitations of a local moment system. Ab initio calculations of the dynamic magnetic susceptibility suggest that the high energy behavior is dominated by the dampingmore » of spin waves by particle-hole excitations.« less
  • 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 ZrZn 2 and Sc 3In, 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 hasmore » 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. In conclusion, 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.« less