Nonsaturating magnetoresistance, anomalous Hall effect, and magnetic quantum oscillations in the ferromagnetic semimetal PrAlSi

Lyu, Meng; Xiang, Junsen; Mi, Zhenyu; Zhao, Hong-Kang; Wang, Zhen; Liu, Enke; Chen, Genfu; Ren, Zhoupeng; Li, Gang; Sun, Peijie

doi:10.1103/physrevb.102.085143

Cited by 42 publications

(39 citation statements)

References 43 publications

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“…1(c)], which is consistent with the temperature-dependent carrier mobility in Fig. S2 and a previous comparative study on magnetic PrAlSi and nonmagnetic LaAlSi [26].…”

Section: Resultssupporting

confidence: 91%

Anisotropic Fano resonance in the Weyl semimetal candidate LaAlSi

et al. 2020

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Topological Weyl semimetal (WSM) is a solid-state realization of chiral Weyl fermions, whose phonon behaviors provide in-depth knowledge of their electronic properties. In this work, anisotropic Fano resonance is observed in a type-II WSM candidate LaAlSi by polarized Raman spectroscopy. The asymmetric line shape occurs for the B 2 1 phonon mode of LaAlSi only for 488-and 532-nm laser excitations but not for 364-, 633-, and 785-nm excitations, suggesting the excitation selectivity. The asymmetry, frequency, and linewidth of the B 2 1 phonon mode, along with the spectral background, all show fourfold rotational symmetry as a function of the polarization angle in the polarized Raman spectra. While the shift of Raman frequency in a metal or semimetal is typically attributed to Kohn anomaly, here we show that the anisotropic frequency shift in LaAlSi cannot be explained by the effect of Kohn anomaly, but potentially by the anisotropic scattering background of Fano resonance. Origins of the excitation-energy dependence and anisotropic behavior of the Fano resonance are discussed by the first-principles calculated electronic band structure and phonon dispersion.

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“…1(c)], which is consistent with the temperature-dependent carrier mobility in Fig. S2 and a previous comparative study on magnetic PrAlSi and nonmagnetic LaAlSi [26].…”

Section: Resultssupporting

confidence: 91%

Anisotropic Fano resonance in the Weyl semimetal candidate LaAlSi

et al. 2020

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“…It should noted that F 1 gradually decreases with temperature, changes from 43 T at 80 mK to 32 T at 35 K, as shown in the inset. Similar temperature dependence in F 1 was also reported in an earlier work on PrAlSi [24], whereas the values of F 1 are relatively smaller than ours. We attribute this discrepancy to some difference in stoichiometry [19].…”

supporting

confidence: 92%

“…Here we present a new example of field-induced LT beyond heavy-fermion systems in the magnetic Weyl semimetal candidate PrAlSi, by a systematic study of quantum oscillation (QO) effect extended to a magnetic field up to 55 T. We observe a single frequency (F 1 = 43 T) below a critical field of B * =14.5 T, in agreement with what was previously reported [24]. Above B * , we see clearly the emergence of two new frequencies (F 2 = 62 T and F 3 = 103 T) and the disappearance of the original F 1 .…”

supporting

confidence: 89%

“…The list includes the coexistence of type-I and type-II Weyl fermion in LaAlSi [32] and LaAlGe [33], a novel topological Hall effect in CeAlGe [34] and anisotropic anomalous Hall effect in CeAlSi [35], and Weyl-driven collective magnetism in NdAlSi [36]. The compound PrAlSi studied here is a ferromagnetic semimetal with Curie temperature T C ∼18 K. A recent work based on static field (9 T) transport measurements by Lyu et al revealed a large anomalous Hall conductivity ∼2000 Ω −1 cm −1 and an unusual temperature dependence of QO with a single frequency [24].…”

mentioning

confidence: 55%

“…The inset of Fig. 1(a) shows the crystal structure of PrAlSi with the magnetic moments of Pr easily orientated along c-axis after the application of a small field [24]. In our transport measurements, the magnetic field was along the c-axis and the electrical current was along the b-axis (see more about material and method in supplemental material (SM)).…”

mentioning

confidence: 99%

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Field-Induced Lifshitz Transition in the Magnetic Weyl Semimetal Candidate PrAlSi

Wu¹,

Zuo²,

Zhao³

et al. 2022

Preprint

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Lifshitz transition (LT) refers to an abrupt change in the electronic structure and Fermi surface, and is associated to a variety of emergent quantum phenomena. Amongst the LTs observed in known materials, the field-induced LT has been rare and its origin remains elusive. To understand the origin of field-induced LT, it is important to extend the material basis beyond the usual setting of heavy fermion metals. Here, we report on a field-induced LT in PrAlSi, a magnetic Weyl semimetal candidate with localized 4f electrons, through a study of magnetotransport up to 55 T. The quantum oscillation analysis reveals that across a threshold field B * ≈14.5 T the oscillation frequency (F1 = 43 T) is replaced by two new frequencies (F2 = 62 T and F3 = 103 T). Strikingly, the LT occurs well below quantum limit, with obvious temperature-dependent oscillation frequency and field-dependent cyclotron mass. Our work not only enriches the rare examples of field-induced LTs, but also paves the way for further investigation on the interplay among topology, magnetism and electronic correlation.

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