Field Dependence of the Muon Spin Relaxation Rate in MnSi

Gat-Malureanu, I. M.; Fukaya, A.; Larkin, M.; Millis, Andrew J.; Russo, Peter L.; Savici, A. T.; Uemura, Y. J.; Kyriakou, P. P.; Luke, G. M.; Wiebe, C. R.; Sushko, Yu. V.; Heffner, R. H.; MacLaughlin, D. E.; Andreica, Daniel; Kalvius, Georg Michael

doi:10.1103/physrevlett.90.157201

Cited by 15 publications

(16 citation statements)

References 14 publications

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“…Qualitatively similar behavior can also be seen in the variation of 1/T 1 in ZF shown in the SI, and the magnitude of 1/T 1 exhibits a dependence on LF similar to the known results for pure MnSi at ambient pressure. 26 The prominent peaks in the plot of 1/T 1 vs T for (Mn,Fe)Si over a wide pressure range in Fig. 3d is in a clear contrast to the pressure dependence of 1/T 1 observed in pure MnSi 13 re-plotted here in Fig.…”

Section: Resultsmentioning

confidence: 67%

“…In MuSR studies, this feature is manifest as a discontinuous change of the order parameter below T C 24 and a modification of the critical exponent above T C . 25,26 The spin correlation time τ, however, keeps increasing with decreasing T even in this narrow temperature region above T C , 22 resulting in a peak of the muon spin relaxation rate 1/T 1 at T C . 13,17,25,26 This narrow temperature region above T C is illustrated by the pink region (HF) in Fig.…”

Section: Introductionmentioning

confidence: 97%

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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: Resultsmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 97%

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

et al. 2017

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“…With the knowledge acquired in the static regime, we discuss now the temperature dependence of the muon depolarization rate in the dynamical regime, which diverges when approaching T g from higher temperatures due to critical fluctuations [29]. The correlation time τ c = 1/ν of the magnetic moments at the muon site can be deduced from λ d using Eq.…”

Section: Resultsmentioning

confidence: 99%

Spin-glass ground state inMn1−xCoxSi

et al. 2010

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We report the discovery of a new spin glass ground state in the transition metal monosilicides with the B20 crystallographic structure. Magnetic, transport, neutron and muon investigation of the solid solution Mn1−xCoxSi have revealed a new dome in the phase diagram with evidence of antiferromagnetic interactions. For Mn rich compounds, a sharp decrease of the Curie temperature is observed upon Co doping and neutron elastic scattering shows that helimagnetic order of MnSi persists up to x = 0.05 with a shortening of the helix period. For higher Co (0.05 < x < 0.90) concentrations, the Curie-Weiss temperature changes sign and the system enters a spin glass state upon cooling (Tg = 9 K for xCo = 0.50), due to chemical disorder. In this doping range, a minimum appears in the resistivity, attributed to scattering of conduction electron by localized magnetic moments.

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“…The field dependence of the muon spin relaxation rate reported by Gat-Malureanu et al [12] requires an unconventional explanation. In addition, the optical conductivity even at ambient pressure is strongly nonDrude-like, with the behavior having been represented by Mena et al in terms of a frequency-dependent effective mass.…”

Section: Introductionmentioning

confidence: 92%

Implications of the B20 crystal structure for the magnetoelectronic structure ofMnSi

Jeong

Pickett

2004

Phys. Rev. B

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Due to increased interest in the unusual magnetic and transport behavior of MnSi and its possible relation to its crystal structure (B20) which has unusual coordination and lacks inversion symmetry, we provide a detailed analysis of the electronic and magnetic structure of MnSi. The non-symmorphic P213 spacegroup leads to unusual fourfold degenerate states at the zone corner R point, as well as "sticking" of pairs of bands throughout the entire Brillouin zone surface. The resulting Fermi surface acquires unusual features as a result of the band sticking. For the ferromagnetic system (neglecting the long wavelength spin spiral) with the observed moment of 0.4 µB/Mn, one of the fourfold levels at R in the minority bands falls at the Fermi energy (EF ), and a threefold majority level at k=0 also falls at EF . The band sticking and presence of bands with vanishing velocity at EF imply an unusually large phase space for long wavelength, low energy interband transitions that will be important for understanding the unusual resistivity and far infrared optical behavior.

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Field Dependence of the Muon Spin Relaxation Rate in MnSi

Cited by 15 publications

References 14 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

Spin-glass ground state inMn1−xCoxSi

Implications of the B20 crystal structure for the magnetoelectronic structure ofMnSi

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