Magnetization of Mn1–x Fe x Si in high magnetic fields up to 50 T: Possible evidence of a field-induced Griffiths phase

Demishev, S. V.; Samarin, A. N.; Huang, Junwei; Ġlushkov, V. V.; Lobanova, I. I.; Sluchanko, N. E.; Chubova, N. M.; Dyadkin, Vadim; Grigoriev, S. V.; Kagan, M. Yu.; Vanacken, Johan; Moshchalkov, Victor

doi:10.1134/s0021364016140022

Cited by 12 publications

(11 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At the same time, in all the cases (with and without phase separation), the electron polaron effect leads to the anomalous temperature dependence of the resistivity in 3D and especially in quasi 2D (layered) case providing possible alternative explanation to the mechanism of spin dependent tunneling conductivity when we try to explain resistivity characteristics in manganese silicides [76] or layered manganites. In manganese silicides MnSi and in the stoichiometric alloys Mn 1−x Fe x Si, we have a very peculiar power-law (almost of the square root type) dependence of the resistivity R(T ) (for temperatures in the range from 30 to 250 K) and magnetization M (H) (in moderate and high magnetic fields from 2-4 T up to 50 Tesla) in the paramagnetic phase.…”

mentioning

confidence: 86%

Electronic phase separation: Recent progress in the old problem

2021

View full text Add to dashboard Cite

mentioning

confidence: 86%

Electronic phase separation: Recent progress in the old problem

2021

View full text Add to dashboard Cite

“…Several studies reported spin glass behavior in polycrystalline samples of Mn 1−x Fe x Si and Mn 1−x Co x Si for large doping levels [38,39]. In turn, the behavior at H c1 raises the question how to better gauge the effects of defects and disorder as compared with the hierarchy of energy scales, and if there are still well-defined thermodynamic phase boundaries and long-range order under increasing doping.…”

Section: B Terminology and Outlinementioning

confidence: 99%

“…However, under increasing doping the properties at high concentrations may eventually be dominated by disorder. This has been considered in a number of studies on polycrystalline samples, where short-range order and glassy behavior have been reported [38,39].…”

Section: B Broader Implicationsmentioning

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
View full text Add to dashboard Cite

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.

show abstract

“…The exponential relaxation rules out a spin-glass-like ground state, the footprint of which would have been a stretched exponential decay [50,51]. Furthermore, the NSE spectra become completely elastic at the base temperature, a result, which excludes the spin liquid scenario suggested for x > x * [35][36][37]. The elastic fraction, depicted in Fig.…”

Section: (B) and (C)mentioning

confidence: 89%

“…On the other hand, the helimagnetic Bragg peaks, a signature of long range helimagnetic periodicity, disappear abruptly at a much lower concentration of x * ∼ 0.11. For x x * magnetic susceptibility and electric transport phenomena reveal a non-Fermi liquid behaviour, which, as in MnSi under pressure, has been attributed to a chiral spin liquid state governed by quantum fluctuations [35][36][37]. Here we investigate the evolution of helimagnetic correlations and their dynamics as a function of chemical substitution in Mn 1−x Fe x Si using polarised neutron scattering and Neutron Spin Echo (NSE) spectroscopy.…”

Section: Introductionmentioning

confidence: 97%

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

Pappas

Leonov

Bannenberg

et al. 2021

Phys. Rev. Research

View full text Add to dashboard Cite

We present a comprehensive investigation of the evolution of helimagnetic correlations in Mn1−xFexSi with increasing doping. By combining polarised 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 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 * .

show abstract

Magnetization of Mn1–x Fe x Si in high magnetic fields up to 50 T: Possible evidence of a field-induced Griffiths phase

Cited by 12 publications

References 42 publications

Electronic phase separation: Recent progress in the old problem

Electronic phase separation: Recent progress in the old problem

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

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

Contact Info

Product

Resources

About

Magnetization of Mn1–x Fe x Si in high magnetic fields up to 50 T: Possible evidence of a field-induced Griffiths phase

Cited by 12 publications

References 42 publications

Electronic phase separation: Recent progress in the old problem

Electronic phase separation: Recent progress in the old problem

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

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

Contact Info

Product

Resources

About

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