Pressure-tuning domain-wall chirality in noncentrosymmetric magnetic Weyl semimetal CeAlGe

He, Xiaobo; Li, Yuke; Zeng, Hui; Zhu, Zengwei; Tan, Shanjun; Zhang, Yongjun; Cao, Chao; Luo, Yongkang

doi:10.1007/s11433-022-2051-4

Cited by 9 publications

(2 citation statements)

References 60 publications

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“…Similar behavior was also observed in the isostructural CeAlGe. [35] Meanwhile, the − ln T behavior in ρ(T ) is also enhanced, signifying an enhancement of the Kondo effect in CeGaSi. As is well known, by applying pressure, most of the antiferromagnetic transitions of heavy fermions first increase and then decrease, and finally reach a quantum critical regime.…”

Section: Resultsmentioning

confidence: 96%

Magnetism, heat capacity, magnetocaloric effect, and magneto-transport properties of heavy fermion antiferromagnet CeGaSi

Zhang 张,

Dong 董,

Bai 白

et al. 2024

Chinese Phys. B

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We have synthesized high quality single crystals of CeGaSi by a Ga self-flux method and investigated its physical properties by means of magnetic susceptibility, specific heat and electrical resistivity measurements as well as high pressure effect. Magnetic measurements reveal that an antiferromagnetic order develops below T m ~ 10.4 K with magnetic moments orientated in the ab plane. The enhanced electronic specific heat coefficient as well as the negative logarithmic slopes in the resistivity of CeGaSi indicate that the title compound belongs to the family of Kondo system with heavy fermion ground states. The max magnetic entropy change –ΔS M max (μ 0 H⊥c, μ 0 H = 7 T) around T m was found to reach up to 11.85 J·kg–1·K–1. Remarkably, both the antiferromagnetic transition temperature and -lnT behavior increase monotonically with pressure applied to 20 kbar, indicating that much higher pressure will be needed to reach its quantum critical point.

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Section: Resultsmentioning

confidence: 96%

Magnetism, heat capacity, magnetocaloric effect, and magneto-transport properties of heavy fermion antiferromagnet CeGaSi

Zhang 张,

Dong 董,

Bai 白

et al. 2024

Chinese Phys. B

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“…109) is a new class of magnetic Weyl semimetals where both the inversion and time-reversal symmetries are broken [16,17]. Recent studies have suggested a topological magnetic order in SmAlSi [18] and NdAlSi [19,20], topological Hall effect in SmAlSi [18] and CeAl(Si,Ge) [18,21,22], anomalous Hall and Nernst effects * kikugawa.naoki@nims.go.jp in PrAl(Ge,Si) and NdAl(Si,Ge) [23][24][25], anomalous thermal conductivity [26], unusual quantum oscillations in NdAlSi [27,28], possible axial gauge fields in PrAlGe [25], domain wall chirality in CeAl(Si,Ge) [22,29], surface Fermi arcs and bulk Weyl fermion dispersion in PrAlGe [30] and NdAlSi [31], and reconstruction of the electronic structure across the magnetic transition in PrAlGe [32].…”

Section: Introductionmentioning

confidence: 99%

Anomalous Hall effect in the magnetic Weyl semimetal NdAlGe with plateaus observed at low temperatures

Kikugawa,

Uji,

Terashima

2024

Phys. Rev. B

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In the RAl(Si,Ge) (R: lanthanides) family, both spatial inversion and time-reversal symmetries are broken. This may offer opportunities to study Weyl-fermion physics in nontrivial spin structures emerging from a noncentrosymmetric crystal structure. In this study, we investigated the anomalous Hall effect (AHE) in NdAlGe via magnetotransport, magnetization, and magnetic torque measurements down to 40 mK (0.4 K for magnetization). The single crystals grown by a laser-heated floating-zone method exhibit a single magnetic phase transition at T M = 13.5 K, where the T M is the transition temperature. With the magnetic field parallel to the easy [001] axis, the AHE gradually evolves as the temperature decreases below T M . The anomalous Hall conductivity (AHC) reaches ∼320 −1 cm −1 at 40 mK in the magnetically saturated state. Except in low-temperature low-field plateau phases, the AHC and magnetization are proportional, and their ratio agrees with the ratios for conventional ferromagnets, suggesting that the intrinsic AHE occurs by the Karplus-Luttinger mechanism. Below ∼0.6 K, the curves of Hall resistivity against the field exhibit plateaus at low fields below ∼0.5 T, correlating with the plateaus in the magnetization curve. For the first plateau, the magnetization is one order of magnitude smaller than the magnetically saturated state, whereas the AHE is more than half that in the saturated state. This finding under well below T M suggests that the AHE at the first plateau is not governed by the magnetization and may be interpreted based on a multipole or spin chirality.

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Absence of metallicity and bias-dependent resistivity in low-carrier-density EuCd2As2

Wang,

Ma,

Yuan

et al. 2024

Sci. China Phys. Mech. Astron.

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Pressure-tuning domain-wall chirality in noncentrosymmetric magnetic Weyl semimetal CeAlGe

Cited by 9 publications

References 60 publications

Magnetism, heat capacity, magnetocaloric effect, and magneto-transport properties of heavy fermion antiferromagnet CeGaSi

Magnetism, heat capacity, magnetocaloric effect, and magneto-transport properties of heavy fermion antiferromagnet CeGaSi

Anomalous Hall effect in the magnetic Weyl semimetal NdAlGe with plateaus observed at low temperatures

Absence of metallicity and bias-dependent resistivity in low-carrier-density EuCd2As2

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