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  Quantum tricritical points in NbFe2

Friedemann, S., Duncan, W. J., Hirschberger, M., Bauer, T. W., Küchler, R., Neubauer, A., et al. (2018). Quantum tricritical points in NbFe2. Nature Physics, 14, 62-67. doi:10.1038/nphys4242.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-E81E-B Version Permalink: http://hdl.handle.net/21.11116/0000-0001-140D-B
Genre: Journal Article

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 Creators:
Friedemann, Sven1, Author
Duncan, Will J.1, Author
Hirschberger, Maximilian1, Author
Bauer, Thomas W.2, Author              
Küchler, Robert2, Author              
Neubauer, Andreas1, Author
Brando, Manuel3, Author              
Pfleiderer, Christian1, Author
Grosche, F. Malte1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3Manuel Brando, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863469              

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 Abstract: Quantum critical points (QCPs) emerge when a second-order phase transition is suppressed to zero temperature. In metals the quantum fluctuations at such a QCP can give rise to new phases, including unconventional superconductivity. Whereas antiferromagnetic QCPs have been studied in considerable detail, ferromagnetic (FM) QCPs are much harder to access. In almost all metals FM QCPs are avoided through either a change to first-order transitions or through an intervening spin-density-wave (SDW) phase. Here, we study the prototype of the second case, NbFe2. We demonstrate that the phase diagram can be modelled using a two-order-parameter theory in which the putative FM QCP is buried within a SDW phase. We establish the presence of quantum tricritical points (QTCPs) at which both the uniform and finite wavevector susceptibility diverge. The universal nature of our model suggests that such QTCPs arise naturally from the interplay between SDW and FM order and exist generically near a buried FM QCP of this type. Our results promote NbFe2 as the first example of a QTCP, which has been proposed as a key concept in a range of narrow-band metals, including the prominent heavy-fermion compound YbRh2Si2.

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Language(s): eng - English
 Dates: 2018-01-162018-01-16
 Publication Status: Published in print
 Pages: -
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 Rev. Method: -
 Identifiers: DOI: 10.1038/nphys4242
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Title: Nature Physics
  Other : Nat. Phys.
Source Genre: Journal
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Publ. Info: London : Nature Pub. Group
Pages: - Volume / Issue: 14 Sequence Number: - Start / End Page: 62 - 67 Identifier: ISSN: 1745-2473
CoNE: /journals/resource/1000000000025850