Paramagnetic spin fluctuations in the weak itinerant-electron ferromagnet MnSi

Ishikawa, Yoshikazu; Noda, Y.; Uemura, Yohei; Majkrzak, C. F.; Shirane, G.

doi:10.1103/physrevb.31.5884

Cited by 160 publications

(95 citation statements)

References 24 publications

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“…The continuous line in the figure corresponds to ξ 111 = a −ν with a = 12 ± 2Å and ν = 0.5 ± 0.2. (13) The dotted line represents ξ = 5.6 −0.5Å , the extrapolated curve from the high-temperature TAS data of Ishikawa et al 5 It is remarkable that this extrapolation from very high temperatures (100-300 K) is only a factor 2 off our results. …”

Section: Correlation Lengthcontrasting

confidence: 43%

“…In contrast, the fluctuating paramagnetic phase above T C has finite correlations and the scattering function S(Q,ω) is a superposition of Lorentzians. 5,9 In the quasielastic limit, where the energy transfer is much smaller than the energies of the incoming beam and of the sample, the neutron scattering cross section becomes…”

Section: Experimental Methodsmentioning

confidence: 99%

“…With this relation, it will be possible to compare our NSE results with the triple-axis neutron spectroscopy (TAS) measurements from the literature. 5,25 This so-called Larmor labeling requires polarized neutrons and some polarization analysis features are an integral part of NSE. 26 The pulse sequence, π/2 flip-precession-π flip (at the sample)-precession-π/2 flip, is that of the classical Hahn sequence of NMR Spin Echo "Normal" paramagnetic scattering acts as a π flipper and gives an echo without the otherwise obligatory π flipper, which leads to a straightforward and unambiguous separation of the magnetic and nuclear signals.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…5 It was shown that strong magnetic correlations exist up to room temperature and that the magnetic excitation spectrum is well described by the Moriya-Kawabata theory for weak itinerant ferromagnets. The TAS measurements, however, did not have the resolution in energy transfer required to analyze the magnetic fluctuations close to T C .…”

Section: Neutron Spin Echomentioning

confidence: 99%

“…4 The strong magnetic fluctuations, which are due to the weak itinerant magnetism and the vicinity of a magnetic instability, exist not only above T C , 5 but also persist in the low-temperature ordered phase. 6 The magnetic fluctuations lead to an enhanced effective electron mass, a broad specific heat maximum reminiscent of the specific heat of spin liquids, frustrated magnets or spin glasses, 7 and broad features on thermal expansion and ultrasound measurements, which almost completely mask the helical transition.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic fluctuations and correlations in MnSi: Evidence for a chiral skyrmion spin liquid phase

et al. 2011

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We present a comprehensive analysis of high-resolution neutron scattering data involving neutron spin echo spectroscopy and spherical polarimetry, which confirm the first-order nature of the helical transition in MnSi. The experiments reveal the existence of a totally chiral dynamic phase in a very narrow temperature range above T C . This unconventional magnetic short-range order has a topology similar to that of a skyrmion liquid or the blue phases of liquid crystals.

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Section: Correlation Lengthcontrasting

confidence: 43%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Neutron Spin Echomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic fluctuations and correlations in MnSi: Evidence for a chiral skyrmion spin liquid phase

et al. 2011

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Phase Transitions and Finite Temperature Magnetism: Experiment and Analysis

Kaul

2007

Handbook of Magnetism and Advanced Magnetic Materials

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Magnetic excitations, prevailing in different temperature regimes that lie below the magnetic ordering temperature, and static critical phenomena near the thermally‐driven magnetic order–disorder phase transitions in spin systems in which the electrons responsible for magnetism are either localized or itinerant are reviewed from the experimental point of view. Besides bringing out clearly the importance of the energy and time scales governing various physical processes connected with the finite temperature magnetism and phase transitions in such systems, a brief account of the relevant theoretical background and crucial steps in the data analyses is given so as to prepare the ground for a meaningful comparison between theory and experiment. Such a comparison, in turn, is shown to provide improved understanding of the nature and origin of magnetic excitations and critical phenomena in localized‐spin and itinerant‐electron systems. In addition, this review highlights both the power as well as the limitations of the experimental techniques employed in the literature to study magnetic excitations and deals extensively with the magnon‐to‐fracton crossover in systems with localized spins and crossovers between different critical regimes in isotropic spin systems with long‐range interactions or spin systems in which long‐range interactions occur in association with magnetic anisotropy.

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