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Restoration of quantum critical behavior by disorder in pressure-tuned (Mn,Fe)Si

Goko, Tatsuo; Arguello, Carlos J.; Hamann, Andreas; Wolf, Thomas; Lee, Minhyea; Reznik, Dmitry; Maisuradze, Alexander; Khasanov, Rustem; Morenzoni, Elvezio; Uemura, Yasutomo J.


In second-order quantum phase transitions from magnetically ordered to paramagnetic states at T = 0, tuned by pressure or chemical substitution, a quantum critical point is expected to appear with critical behavior manifesting in the slowing down of spin fluctuations in the paramagnetic state and a continuous development of the order parameter in the ordered state. Quantum criticality is discussed widely as a possible driving force for unconventional superconductivity and other exotic phenomena in correlated electron systems. In the real world, however, quantum critical points and quantum criticality are often masked by a preceding first-order transition and/or the development of competing states. Pressure tuning of the itinerant-electron helical magnet MnSi is a well-known example of the suppression of a quantum critical point due to a first-order phase transition and resulting destruction of the ordered state. Utilizing muon spin relaxation experiments, here we report that 15% Fe-substituted (Mn,Fe)Si exhibits completely different behavior with pressure tuning, including the restoration of second-order quantum critical behavior and a quantum critical point at p QPC  ~ 21–23 kbar, which coincides with the T = 0 crossing point of the extrapolated phase boundary line of pure MnSi. ... mehr

Volltext §
DOI: 10.5445/IR/1000073874
DOI: 10.1038/s41535-017-0049-0
Zitationen: 25
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2017
Sprache Englisch
Identifikator ISSN: 2397-4648
KITopen-ID: 1000073874
HGF-Programm 43.21.01 (POF III, LK 01) Quantum Correlations in Condensed Matter
Erschienen in npj Quantum Materials
Verlag Nature Research
Band 2
Heft 1
Seiten 44
Nachgewiesen in Dimensions
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