ABSTRACT Fermi liquid theory provides a remarkably powerful framework for the description of the conduction electrons in metals and their ordering phenomena, such as superconductivity,

ferromagnetism, and spin- and charge-density-wave order. A different class of ordering phenomena of great interest concerns spin configurations that are topologically protected, that is,

their topology can be destroyed only by forcing the average magnetization locally to zero1. Examples of such configurations are hedgehogs (points at which all spins are either pointing

inwards or outwards) and vortices. A central question concerns the nature of the metallic state in the presence of such topologically distinct spin textures. Here we report a high-pressure

topological winding—is unaffected in sign or magnitude and becomes an important characteristic of the metallic state. The regime of the topological Hall signal in temperature, pressure and

magnetic field coincides thereby with the exceptionally extended regime of a pronounced non-Fermi-liquid resistivity3,30. The observation of this topological Hall signal in the regime of the

NFL resistivity suggests empirically that spin correlations with non-trivial topological character may drive a breakdown of Fermi liquid theory in pure metals. Access through your

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BEING VIEWED BY OTHERS MECHANISM OF THE INSULATOR-TO-METAL TRANSITION AND SUPERCONDUCTIVITY IN THE SPIN LIQUID CANDIDATE NAYBSE2 UNDER PRESSURE Article Open access 14 February 2022

HIGH-TEMPERATURE SHORT-RANGE ORDER IN MN3RHSI Article Open access 21 July 2020 ANOMALOUS ENHANCEMENT OF THE NERNST EFFECT AT THE CROSSOVER BETWEEN A FERMI LIQUID AND A STRANGE METAL Article

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Download references ACKNOWLEDGEMENTS We wish to thank P. Böni, K. Everschor, M. Garst, M. Janoschek, S. Mayr and A. Rosch for discussions and support. R.R., M.H., A.B., M.W. and C.F.

acknowledge financial support through the TUM Graduate School. Financial support through DFG TRR80 and DFG FOR960 as well as ERC-AdG (291079 TOPFIT) are gratefully acknowledged. AUTHOR

INFORMATION AUTHORS AND AFFILIATIONS * Physik Department E21, Technische Universität München, Garching, D-85748, Germany R. Ritz, M. Halder, M. Wagner, C. Franz, A. Bauer & C. Pfleiderer

Authors * R. Ritz View author publications You can also search for this author inPubMed Google Scholar * M. Halder View author publications You can also search for this author inPubMed 

Google Scholar * M. Wagner View author publications You can also search for this author inPubMed Google Scholar * C. Franz View author publications You can also search for this author

inPubMed Google Scholar * A. Bauer View author publications You can also search for this author inPubMed Google Scholar * C. Pfleiderer View author publications You can also search for this

author inPubMed Google Scholar CONTRIBUTIONS R.R. and C.P. developed the experimental set-up; R.R. performed the transport measurements; M.H. and M.W. performed magnetization measurements;

C.F. wrote the software for analysing the data; A.B. grew the single-crystal samples and characterized them; R.R. and C.P. analysed the experimental data; C.P. supervised the experimental

work; C.P. proposed this study and wrote the manuscript; all authors discussed the data and commented on the manuscript. CORRESPONDING AUTHORS Correspondence to R. Ritz or C. Pfleiderer.

ETHICS DECLARATIONS COMPETING INTERESTS The authors declare no competing financial interests. SUPPLEMENTARY INFORMATION SUPPLEMENTARY INFORMATION This file contains Supplementary Text and

Data, which gives details of the experimental methods and includes additional data in support of the results. Also included are Supplementary Figures 1-3, Supplementary Table 1 and

additional references. (PDF 461 kb) POWERPOINT SLIDES POWERPOINT SLIDE FOR FIG. 1 POWERPOINT SLIDE FOR FIG. 2 POWERPOINT SLIDE FOR FIG. 3 RIGHTS AND PERMISSIONS Reprints and permissions

ABOUT THIS ARTICLE CITE THIS ARTICLE Ritz, R., Halder, M., Wagner, M. _et al._ Formation of a topological non-Fermi liquid in MnSi. _Nature_ 497, 231–234 (2013).

https://doi.org/10.1038/nature12023 Download citation * Received: 03 December 2012 * Accepted: 15 February 2013 * Published: 01 May 2013 * Issue Date: 09 May 2013 * DOI:

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