Acoustic de Haas-Van Alphen effect in LaSb and CeSb

Settai, Rikio; Gotô, Terutaka; Sakatsume, S.; Kwon, Y.S.; Suzuki, Takao; Kasuya, T.

doi:10.1016/0921-4526(93)90527-d

Cited by 60 publications

(34 citation statements)

References 17 publications

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“…hole surfaces at the center of the Brillouin zone and the ellipsoidal electron pockets crossing the faces. Prior studies of quantum oscillations in the magnetic and acoustic channels have mapped these hole and electron Fermi surfaces in both materials in detail (23,24,28,29). The principal SdH frequencies that we observe in LaSb (F 0 = 212 T) and LaBi (F 0 = 271 T) match the cross-sectional area of the electron pocket at the X point.…”

Section: Significancesupporting

confidence: 52%

Temperature−field phase diagram of extreme magnetoresistance

Tafti

Gibson

Kushwaha

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

103

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The recent discovery of extreme magnetoresistance (XMR) in LaSb introduced lanthanum monopnictides as a new platform to study this effect in the absence of broken inversion symmetry or protected linear band crossing. In this work, we report XMR in LaBi. Through a comparative study of magnetotransport effects in LaBi and LaSb, we construct a temperature−field phase diagram with triangular shape that illustrates how a magnetic field tunes the electronic behavior in these materials. We show that the triangular phase diagram can be generalized to other topological semimetals with different crystal structures and different chemical compositions. By comparing our experimental results to band structure calculations, we suggest that XMR in LaBi and LaSb originates from a combination of compensated electron−hole pockets and a particular orbital texture on the electron pocket. Such orbital texture is likely to be a generic feature of various topological semimetals, giving rise to their small residual resistivity at zero field and subject to strong scattering induced by a magnetic field.extreme magnetoresistance | topological semimetal | orbital texture M aterials with large magnetoresistance (MR) have applications in electronics as magnetic memories (1, 2), in spintronics as magnetic valves (3), and in industry as magnetic sensors or magnetic switches (4, 5). Recent reports of extreme magnetoresistance (XMR) in several nonmagnetic semimetals have attracted attention due to its distinction from giant and collosal MR in magnetic semiconductors (2, 6). XMR is observed in Dirac semimetals such as Na 3 Bi or Cd 3 As 2 (7, 8), Weyl semimetals such as NbP, NbAs, or TaAs (9-11), and layered semimetals such as WTe 2 , NbSb 2 , or PtSn 4 (12-16). The recent discovery of XMR in LaSb that does not belong to any of these categories shows that XMR is a ubiquitous phenomenon observed in seemingly unrelated materials (17). It also clearly underlines that the mechanism for XMR is not understood. The present article is a first attempt to unify the phenomenology of XMR in seemingly unrelated materials, to provide a common phase diagram for XMR, and to elucidate its underlying mechanism. We hope that this will enable theorists to develop a model capable of describing the underlying physics, once all of the salient experimental features are captured.We report the discovery of XMR in LaBi with similar crystal structure and chemical composition to LaSb. Fig. 1 shows the simple rock salt structure of lanthanum monopnictides. Through a comparative study of longitudinal and transverse magnetotransport in LaSb and LaBi, we construct a characteristic triangular T-H phase diagram for XMR in lanthanum monopnictides. Our band structure calculations, quantum oscillations, and Hall Effect measurements suggest that XMR is rooted in a combination of compensated electron−hole pockets and a mixed orbital texture within the electron pockets. The orbital texture is a result of lanthanum d states crossing the pnictogen p states. Spin−orbit coupling then opens a...

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Section: Significancesupporting

confidence: 52%

Temperature−field phase diagram of extreme magnetoresistance

Tafti

Gibson

Kushwaha

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

103

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“…We note that the frequencies expected for the electron pocket α 3 in Fig.3(c) could not be identified from the experimental data in Fig.2(e), similar to that found in the dHvA data [58,59].…”

Section: Iii2 Revealing the Bulk Origin Of The Shubnikov -De Haas Osupporting

confidence: 48%

“…In Fig.2(c) as previously reported [27,35], the anisotropy of ~ 4 for Fα 1 , Fα 2 and the observation of Fβ and Fγ exclude 2D surface states to be (solely) responsible for the observed SdH oscillations. On the other hand, the anisotropy for Fα 1 , Fα 2 is nearly the same as that of the bulk electron pockets revealed by ARPES [42] and dHvA oscillation [58,59] experiments.…”

Section: Iii2 Revealing the Bulk Origin Of The Shubnikov -De Haas Omentioning

confidence: 64%

“…The bulk electronic band structure and Fermi surface of LaSb were investigated more than three decades ago [58][59][60] and also reported in recent publications [27,35,42]. As shown in the projection on the k y -k z plane in Fig.2(a) and in the 3D plot in Fig.3(b), the bulk Fermi surface consists of electron pockets centered at X and elongated along the Γ-X direction in addition to two hole pockets centered at Γ.…”

Section: Iii2 Revealing the Bulk Origin Of The Shubnikov -De Haas Omentioning

confidence: 99%

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Separation of electron and hole dynamics in the semimetal LaSb

Han

Botana

et al. 2017

Phys. Rev. B

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We report investigations on the magnetotransport in LaSb, which exhibits extremely large magnetoresistance (XMR). Foremost, we demonstrate that the resistivity plateau can be explained without invoking topological protection. We then determine the Fermi surface from Shubnikov -de Haas (SdH) quantum oscillation measurements and find good agreement with the bulk Fermi pockets derived from first principle calculations. Using a semiclassical theory and the experimentally determined Fermi pocket anisotropies, we quantitatively describe the orbital magnetoresistance, including its angle dependence. We show that the origin of XMR in LaSb lies in its high mobility with diminishing Hall effect, where the high mobility leads to a strong magnetic field dependence of the longitudinal magnetoconductance. Unlike a one-band material, when a system has two or more bands (Fermi pockets) with electron and hole carriers, the added conductance arising from the Hall effect is reduced, hence revealing the latent XMR enabled by the longitudinal magnetoconductance. With diminishing Hall effect, the magnetoresistivity is simply the inverse of the longitudinal magnetoconductivity, enabling the differentiation of the electron and hole contributions to the XMR, which varies with the strength and orientation of the magnetic field. This work demonstrates a convenient way to separate the dynamics of the charge carriers and to uncover the origin of XMR in multi-band materials with anisotropic Fermi surfaces. Our approach can be readily applied to other XMR materials.

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“…Later, it was pointed out that the pd mixing term plays important role [17][18][19] to explain the Fermi surfaces of CeSb in the ferromagnetic phase [20][21][22][23][24][25] and + + − phase. 25,26) In this paper, we employ the pf mixing model including the pd mixing effect, and examine the stability of the double layer structure in CeSb.…”

Section: §1 Introductionmentioning

confidence: 99%

Theory on the Stability of the Ferromagnetic Double Layer Structure and on the Peak Structure of the Magneto-Optical Spectra of CeSb

Ishiyama

Sakai

2003

J. Phys. Soc. Jpn.

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We propose the pf +pd mixing model for CeSb to explain the stability of the ferromagnetic double layer structure in the magnetic ordering. The pd mixing causes the saddle type singular points, neighboring the ∆ axis, for the bands which gain energy through the pf hybridization with the occupied f state. The peak of the density of states due to this combined effect of the pf mixing and the pd mixing enhances the stability of the double layer structure. The same combined effect also causes the saddle type singular points in the joint density of states of the optical transition. The peak structure of the magneto-optical spectra which has been observed in experiments is explained by the present model.KEYWORDS: CeSb, magnetic order, double layer structure, optical conductivity, pf mixing model §1. Introduction Cerium monopnictides (CeX p , X p =P, As, Sb, Bi) are semimetals with the NaCl type lattice. Their electronic bands have hole surfaces originated from atomic X p p states around Γ, and electron surfaces originated from Ce 5d states around three equivalent X.1) In the temperature (T) and the magnetic field (H) diagram, 2, 3) CeX p 's show various types of magnetic ordered states. They consist of the ferromagnetic layers which stack antiferromagnetically. Many types of stacking sequences appear in the phase diagram. Among CeX p 's, CeSb 3) and CeBi 4, 5) have the type-IA antiferromagnetic (+ + −−) phase with nearly full (J z ≃ ±5/2) magnetic moment as the ground state of weak H case. Here '+' denotes the ferromagnetic layer with the magnetic moment parallel to the field, and '−' denotes the layer anti-parallel to the field.The pair of ferromagnetic layers (++ or −−) is widely observed as a unit of the magnetic structure in CeX p 's. We call it as the 'double layer structure', hereafter.The phase diagram of CeSb has been qualitatively reproduced by the ANNNI model.6-8) However, it is not clear how the parameters of the phenomenological model are related to those of the microscopic model.The origin of the ferromagnetic layer with nearly full moment was explained by the pf mixing model 9-16) proposed by Kasuya et al. The model also succeeded in explaining the origin of the antiferromagnetic stacking of the ferromagnetic layers. However, the stability of the double layer structure with sufficient energy gain has not been obtained.The pd mixing term between X p p bands and Ce d bands is neglected in the energy calculation of the original pf mixing model, because the pd mixing effect dis- * Contact address: NTT Energy and Environment Systems Laboratories, Tokyo 180-8585 appears on the ∆ axis where the pf mixing becomes maximum. Later, it was pointed out that the pd mixing term plays important role [17][18][19] to explain the Fermi surfaces of CeSb in the ferromagnetic phase [20][21][22][23][24][25] and + + − phase. 25, 26)In this paper, we employ the pf mixing model including the pd mixing effect, and examine the stability of the double layer structure in CeSb. Hereafter, we call the model as the pf +pd mixing model. I...

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Acoustic de Haas-Van Alphen effect in LaSb and CeSb

Cited by 60 publications

References 17 publications

Temperature−field phase diagram of extreme magnetoresistance

Temperature−field phase diagram of extreme magnetoresistance

Separation of electron and hole dynamics in the semimetal LaSb

Theory on the Stability of the Ferromagnetic Double Layer Structure and on the Peak Structure of the Magneto-Optical Spectra of CeSb

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