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Evolution of helimagnetic correlations when approaching the quantum critical point of Mn1-xFexSi

Pappas, C.; Leonov, A. O.; Bannenberg, L. J.; Fouquet, P.; Wolf, T.; Weber, F.

Abstract (englisch):
We present a comprehensive investigation of the evolution of helimagnetic correlations in Mn1−xFexSi with increasing doping. By combining polarized neutron scattering and high resolution neutron spin echo spectroscopy we investigate three samples with x = 0.09, 0.11, and 0.14, i.e., with compositions on both sides of the concentration x∗∼0.11 where the helimagnetic Bragg peaks disappear and between x∗ and the quantum critical concentration xC∼0.17, where TC vanishes. We find that the abrupt disappearance of the long range helical periodicity at x∗ does not affect the precursor fluctuating correlations. These build up with decreasing temperature in a similar way as for the parent compound MnSi. Also the dynamics bears strong similarities to MnSi. The analysis of our results indicates that frustration, possibly due to achiral Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions, increases with increasing Fe doping. We argue that this effect explains both the expansion of the precursor phase with increasing x and the abrupt disappearance of long range helimagnetic periodicity at x∗.

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DOI: 10.1103/PhysRevResearch.3.013019
Zugehörige Institution(en) am KIT Institut für Quantenmaterialien und -technologien (IQMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 08.01.2021
Sprache Englisch
Identifikator ISSN: 2643-1564
KITopen-ID: 1000128277
HGF-Programm 43.21.01 (POF III, LK 01) Quantum Correlations in Condensed Matter
Erschienen in Physical review research
Verlag American Physical Society (APS)
Band 3
Heft 1
Seiten 013019
Vorab online veröffentlicht am 11.12.2020
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