Scrutinizing Hall Effect in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Mn</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:mrow><mml:msub><mml:mrow><mml:mi>Fe</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:mrow><mml:mi>Si</mml:mi></mml:mrow></mml:math>: Fermi Surface Evolution and Hidden Quantum Criticality

Ġlushkov, V. V.; Lobanova, I. I.; Ivanov, V. Yu.; Voronov, V. V.; Dyadkin, Vadim; Chubova, N. M.; Grigoriev, S. V.; Demishev, S. V.

doi:10.1103/physrevlett.115.256601

Cited by 28 publications

(25 citation statements)

References 41 publications

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“…14,44,45 Near the disappearance of magnetic order, which occurs for Fe concentrations of approximately 0.16-0.19, a continuous reduction of the ordered moment size was noticed. This suggests a tendency toward second-order criticality, consistent with the present results via pressure tuning.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2017

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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~2 1-23 kbar, which coincides with the T = 0 crossing point of the extrapolated phase boundary line of pure MnSi. This result is quantitatively consistent with the recent theory of itinerant-electron ferromagnets by Sang, Belitz, and Kirkpatrick, who argued that disorder would restore a quantum critical point which is otherwise hidden by a firstorder transition.

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Section: Discussionmentioning

confidence: 99%

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

et al. 2017

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“…In recent years, several studies have addressed the nature of the fluctuations in Mn 1−x Fe x Si at large doping levels [88][89][90]. Unfortunately, these studies infer their conclusions from data recorded at large magnetic fields, where the effects of MCAs no longer dominate.…”

Section: Properties Of Mn 1−x Fe X Si and Mn 1−x Co X Simentioning

confidence: 99%

Evolution of magnetocrystalline anisotropies in Mn1−xFexSi and Mn1−x
Kindervater
¹
,
Adams
²
,
Bauer
³

et al. 2020
Phys. Rev. B
22
4
17
0
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We report a comprehensive small-angle neutron scattering (SANS) study of magnetic correlations in Mn 1−x Fe x Si at zero magnetic field. To delineate changes of magnetocrystalline anisotropies (MCAs) from effects due to defects and disorder, we recorded complementary susceptibility and high-resolution specific heat data and investigated selected compositions of Mn 1−x Co x Si. For all systems studied, the helimagnetic transition temperature and magnetic phase diagrams evolve monotonically with composition consistent with literature. The SANS intensity patterns of the spontaneous magnetic order recorded under zero-field cooling, which were systematically tracked over forty angular positions, display strong changes of the directions of the intensity maxima and smeared out intensity distributions as a function of composition. We show that cubic MCAs account for the complex evolution of the SANS patterns, where for increasing x the character of the MCAs shifts from terms that are fourth order to terms that are sixth order in spin-orbit coupling. The magnetic field dependence of the susceptibility and SANS establishes that the helix reorientation as a function of magnetic field for Fe-or Co-doped MnSi is dominated by pinning due to defects and disorder. The presence of well-defined thermodynamic anomalies of the specific heat at the phase boundaries of the skyrmion lattice phase in the doped samples and properties observed in Mn 1−x Co x Si establishes that the pinning due to defects and disorder remains, however, weak and comparable to the field scale of the helix reorientation. The observation that MCAs, which are sixth order in spin-orbit coupling, play an important role for the spontaneous order in Mn 1−x Fe x Si and Mn 1−x Co x Si offers a fresh perspective for a wide range of topics in cubic chiral magnets such as the generic magnetic phase diagram, the morphology of topological spin textures, the paramagnetic-to-helical transition, and quantum phase transitions.

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“…1b). Consequently, the built-up Hall voltage attains a component U AHE , so-called anomalous Hall component, originating from the spin–orbit interaction and being proportional to the magnetization M z (refs 1, 2, 3, 4, 5; Fig. 1a, right).…”

mentioning

confidence: 99%

Observation of anomalous Hall effect in a non-magnetic two-dimensional electron system

et al. 2017

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Anomalous Hall effect, a manifestation of Hall effect occurring in systems without time-reversal symmetry, has been mostly observed in ferromagnetically ordered materials. However, its realization in high-mobility two-dimensional electron system remains elusive, as the incorporation of magnetic moments deteriorates the device performance compared to non-doped structure. Here we observe systematic emergence of anomalous Hall effect in various MgZnO/ZnO heterostructures that exhibit quantum Hall effect. At low temperatures, our nominally non-magnetic heterostructures display an anomalous Hall effect response similar to that of a clean ferromagnetic metal, while keeping a large anomalous Hall effect angle θAHE≈20°. Such a behaviour is consistent with Giovannini–Kondo model in which the anomalous Hall effect arises from the skew scattering of electrons by localized paramagnetic centres. Our study unveils a new aspect of many-body interactions in two-dimensional electron systems and shows how the anomalous Hall effect can emerge in a non-magnetic system.

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Scrutinizing Hall Effect inMn1−xFexSi: Fermi Surface Evolution and Hidden Quantum Criticality

Abstract: arXiv:1507.05227v1 [cond-mat.str-el] Jul 2015Scrutinizing Hall effect in Mn 1−x Fe x Si: Fermi surface evolution and hidden quantum criticality

Cited by 28 publications

References 41 publications

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

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

Evolution of magnetocrystalline anisotropies in Mn1−xFexSi and Mn1−x
Kindervater
¹
,
Adams
²
,
Bauer
³

et al. 2020
Phys. Rev. B
22
4
17
0
View full text Add to dashboard Cite

Observation of anomalous Hall effect in a non-magnetic two-dimensional electron system

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Scrutinizing Hall Effect inMn1−xFexSi: Fermi Surface Evolution and Hidden Quantum Criticality

Abstract: arXiv:1507.05227v1 [cond-mat.str-el] Jul 2015Scrutinizing Hall effect in Mn 1−x Fe x Si: Fermi surface evolution and hidden quantum criticality

Cited by 28 publications

References 41 publications

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

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

Evolution of magnetocrystalline anisotropies in Mn1−xFexSi and Mn1−xKindervater1, Adams2, Bauer3 et al. 2020Phys. Rev. B224170View full textAdd to dashboardCite

Observation of anomalous Hall effect in a non-magnetic two-dimensional electron system

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Evolution of magnetocrystalline anisotropies in Mn1−xFexSi and Mn1−x
Kindervater
¹
,
Adams
²
,
Bauer
³

et al. 2020
Phys. Rev. B
22
4
17
0
View full text Add to dashboard Cite