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  Anomalous quantum criticality in an itinerant ferromagnet

Huang, C. L., Fuchs, D., Wissinger, M., Schneider, R., Ling, M. C., Scheurer, M. S., et al. (2015). Anomalous quantum criticality in an itinerant ferromagnet. Nature Communications, 6: 8188, pp. 1-5. doi:10.1038/ncomms9188.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-5261-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-5263-3
Genre: Journal Article

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 Creators:
Huang, C. L.1, Author              
Fuchs, D.2, Author
Wissinger, M.2, Author
Schneider, R.2, Author
Ling, M. C.2, Author
Scheurer, M. S.2, Author
Schmalian, J.2, Author
v. Loehneysen, H.2, Author
Affiliations:
1Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
2External Organizations, ou_persistent22              

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 Abstract: The dynamics of continuous phase transitions is governed by the dynamic scaling exponent relating the correlation length and correlation time. For transitions at finite temperature, thermodynamic critical properties are independent of the dynamic scaling exponent. In contrast, at quantum phase transitions where the transition temperature becomes zero, static and dynamic properties are inherently entangled by virtue of the uncertainty principle. Consequently, thermodynamic scaling equations explicitly contain the dynamic exponent. Here we report on thermodynamic measurements (as a function of temperature and magnetic field) for the itinerant ferromagnet Sr1-x CaxRuO3 where the transition temperature becomes zero for x = 0.7. We find dynamic scaling of the magnetization and specific heat with highly unusual quantum critical dynamics. We observe a small dynamic scaling exponent of 1.76 strongly deviating from current models of ferromagnetic quantum criticality and likely being governed by strong disorder in conjunction with strong electron-electron coupling.

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Language(s): eng - English
 Dates: 2015-09-082015-09-08
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000363017100015
DOI: 10.1038/ncomms9188
 Degree: -

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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 6 Sequence Number: 8188 Start / End Page: 1 - 5 Identifier: ISSN: 2041-1723
CoNE: /journals/resource/2041-1723