Electron localization into spin-polaron state in MnSi

Storchak, Vyacheslav G.; Brewer, J. H.; Lichti, R. L.; Lograsso, Thomas A.; Schlagel, Deborah L.

doi:10.1103/physrevb.83.140404

Cited by 20 publications

(48 citation statements)

References 42 publications

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“…The doublet in figures 1 and 2 may originate from a coupled m +e spin system in high transverse magnetic field [19,20,22,[26][27][28][29][30][31]: the two lines correspond to two muon spin-flip transitions between states with the electron spin orientation fixed, the splitting between them being determined by the muon-electron hyperfine interaction A [26,27]. The temperature behaviour of lines with one line going up in frequency and the other going down as temperature decreases is often a signature of a muon-electron bound state [20,22].…”

Section: Muon Spin Rotation Studiesmentioning

confidence: 99%

“…Then the strong ( ) s f d exchange interaction between a carrier and local ( ) f d -moments can cause electron localization into an FM 'droplet' in a PM (or AFM) sea-a SP [32][33][34]. In the process of electron localization into SP in a metal, the exchange energy gain upon transition from the PM to the FM state is opposed by an increase of the electron kinetic energy (the entropy term due to ordering within SP becomes significant only at very high T) [26,27,29,30]. Application of magnetic field releases the carrier from SP into the conduction band-a process which offers not only an explanation of the huge negative MR but also reveals the reason why the carrier number is a strong function of Figure 2.…”

Section: Muon Spin Rotation Studiesmentioning

confidence: 99%

“…Such SP states have been previously invoked to explain μ + SR spectra in strongly correlated insulators [28,38], semiconductors [26,27,31] and metals [29,30]. The latter reference initiated a debate on SP formation in MnSi [39,40].…”

Section: Muon Spin Rotation Studiesmentioning

confidence: 99%

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Spin gap in heavy fermion compound UBe₁₃

et al. 2016

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Heavy fermion (HF) compounds are well known for their unique properties, such as narrow bandwidths, loss of coherence in a metal, non-Fermi-liquid behaviour, unconventional superconductivity, huge magnetoresistance etc. While these materials have been known since the 1970s, there is still considerable uncertainty regarding the fundamental mechanisms responsible for some of these features. Here we report transverse-field muon spin rotation (μ + SR) experiments on the canonical HF compound UBe 13 in the temperature range from 0.025 to 300 K and in magnetic fields up to 7 T. The μ + SR spectra exhibit a sharp anomaly at 180 K. We present a simple explanation of the experimental findings identifying this anomaly with a gap in the spin excitation spectrum of f-electrons opening near 180 K. It is consistent with anomalies discovered in heat capacity, NMR and optical conductivity measurements of UBe 13 , as well as with the new resistivity data presented here. The proposed physical picture may explain several long-standing mysteries of UBe 13 (as well as other HF systems).

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Section: Muon Spin Rotation Studiesmentioning

confidence: 99%

Section: Muon Spin Rotation Studiesmentioning

confidence: 99%

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Spin gap in heavy fermion compound UBe₁₃

et al. 2016

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“…Binding of the muon to the spin polaron was claimed to justify two precessions observed by Storchack et al in high transverse magnetic field. 114 This explanation is alternative to the conventional hypothesis of a muon site made inequivalent by the application of the field, to justify the appearance of more than one frequency. For MnSi the site identification by DFT, supporting accurate transverse field experiments and a careful data analysis, proved that the observed frequencies correspond to the latter case.…”

Section: Is the Muon A Passive Probe?mentioning

confidence: 97%

“…For example, it has been suggested that spin polarons may interact strongly with muons, in particular in the noncentrosymmetric magnetic metal MnSi. 114 In this material the spin polaron would consist of an electron coupled to four Mn neighbors, to form a single large spin entity. Binding of the muon to the spin polaron was claimed to justify two precessions observed by Storchack et al in high transverse magnetic field.…”

Section: Is the Muon A Passive Probe?mentioning

confidence: 99%

Toward the Computational Prediction of Muon Sites and Interaction Parameters

Bonfà

Renzi

2016

J. Phys. Soc. Jpn.

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The rapid developments of computational quantum chemistry methods and supercomputing facilities motivate the renewed interest in the analysis of the muon/electron interactions in µSR experiments with ab initio approaches. Modern simulation methods seem to be able to provide the answers to the frequently asked questions of many µSR experiments: where is the muon? Is it a passive probe? What are the interaction parameters governing the muon-sample interaction? In this review we describe some of the approaches used to provide quantitative estimations of the aforementioned quantities and we provide the reader with a short discussion on the current developments in this field.

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