Three-dimensional band structure of LaSb and CeSb: Absence of band inversion

Oinuma, Hikaru; Souma, S.; Takane, Daichi; Nakamura, Takahiro; Nakayama, K.; Mitsuhashi, T.; Horiba, Koji; Kumigashira, Hiroshi; Yoshida, Makoto; Ochiai, Akira; Takahashi, Takashi; Sato, Takafumi

doi:10.1103/physrevb.96.041120

Cited by 59 publications

(54 citation statements)

References 52 publications

(75 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The uniqueness of the observed magnetoresistance anisotropy in CeBi at TN/2 < T < TN is further corroborated in its topologically trivial counterpart CeSb [57,58]. Similar to CeBi which is in the ground state Type IA at low temperatures (T < TN/2), CeSb also has a transition to its ground state Type IA at T » 8 K (~ TN/3) upon cooling in zero field [50].…”

mentioning

confidence: 58%

Magnetization-governed magnetoresistance anisotropy in the topological semimetal CeBi

et al. 2019

View full text Add to dashboard Cite

Magnetic topological semimetals, the latest member of topological quantum materials, are attracting extensive attention as they may lead to topologically-driven spintronics. Currently, magnetotransport investigations on these materials are focused on the anomalous Hall effect. Here, we report on the magnetoresistance anisotropy of topological semimetal CeBi, which has tunable magnetic structures arising from localized Ce 4f electrons and exhibits both negative and positive magnetoresistances, depending on the temperature. We found that the angle dependence of the negative magnetoresistance, regardless of its large variation with the magnitude of the magnetic field and with temperature, is solely dictated by the field-induced magnetization that is orientated along a primary crystalline axis and flops under the influence of a rotating magnetic field. The results reveal the strong interaction between conduction electrons and magnetization in CeBi. They also indicate that magnetoresistance anisotropy can be used to uncover the magnetic behavior and the correlation between transport phenomena and magnetism in magnetic topological semimetals.Stimulated by the fascinating properties discovered in topological insulators [1], topological quantum materials have become an exciting frontier in condensed matter physics and materials science [2][3][4][5][6][7][8]. Among them, magnetic topological insulators with strong correlations between magnetism and nontrivial band topology exhibit exotic phenomena such as quantum anomalous Hall effect [5,[8][9][10][11] and axion insulator state [12]. However, those novel properties were observed in thin films of magnetic topological insulators converted from known topological insulators by doping magnetic atoms, e.g., chromium-doped (Bi,Sb)2Te3 [10,11] or in a ferromagnet-topological insulator-ferromagnet (FM-TI-FM) sandwich heterostructure [12]. Their fabrication requires advanced molecular beam epitaxy techniques [10][11][12]. The random magnetic dopants also inevitably introduce disorder that can hinder further exploration of topological quantum effects in the material [13,14]. Thus, topological insulators with intrinsic magnetic ordering have been

show abstract

mentioning

confidence: 58%

Magnetization-governed magnetoresistance anisotropy in the topological semimetal CeBi

et al. 2019

View full text Add to dashboard Cite

show abstract

“…CeSb has a rock-salt cubic crystal lattice, resulting in identical electronic structures along the kx, ky and kz directions of the Brillouin zone. Similar to LaSb, it has a bulk anisotropic Fermi surface with elongated electron Fermi pockets [17]. Thus, we expect to see anisotropic magnetoresistance in CeSb when the magnetic field is tilted away from the [001] direction.…”

Section: Orbital-flop Induced Magnetoresistance Anisotropymentioning

confidence: 99%

“…Ln = Y, Sc, Nd, Lu, La, Ho, Ce and X = Sb/Bi) that have recently been investigated intensively in the context of topological materials [11][12][13][14][15][16][17][18][19] and XMR phenomenon [3,[20][21][22][23][24][25][26][27][28][29][30][31]. While its topological nature is currently under debate [3,[16][17][18], its magnetoresistance is the largest among the rare-earth monopnictides, reaching up to 1.6´10 6 % at a magnetic field of 9 T [3]. Distinct from nonmagnetic La and Y monopnictides, CeSb with the Ce 4f-electron state shows various long periodic magnetic structures at low temperatures even in zero magnetic field [3,32,33] ( Supplementary Figure 1).…”

Section: Orbital-flop Induced Magnetoresistance Anisotropymentioning

confidence: 99%

Orbital-flop Induced Magnetoresistance Anisotropy in Rare Earth Monopnictide CeSb

Bao

et al. 2019

Nat Commun

View full text Add to dashboard Cite

The charge and spin of the electrons in solids have been extensively exploited in electronic devices and in the development of spintronics. Another attribute of electrons—their orbital nature—is attracting growing interest for understanding exotic phenomena and in creating the next-generation of quantum devices such as orbital qubits. Here, we report on orbital-flop induced magnetoresistance anisotropy in CeSb. In the low temperature high magnetic-field driven ferromagnetic state, a series of additional minima appear in the angle-dependent magnetoresistance. These minima arise from the anisotropic magnetization originating from orbital-flops and from the enhanced electron scattering from magnetic multidomains formed around the first-order orbital-flop transition. The measured magnetization anisotropy can be accounted for with a phenomenological model involving orbital-flops and a spin-valve-like structure is used to demonstrate the viable utilization of orbital-flop phenomenon. Our results showcase a contribution of orbital behavior in the emergence of intriguing phenomena.

show abstract

“…Lanthanum monopnictides (LaSb and LaBi) [23][24][25][26] have attracted special attention among XMR semimetals due to their simple cubic structure 23 . It has been shown that both LaSb and LaBi are compensated 25,27 but Dirac cones have also been observed clearly in LaBi [28][29][30][31] and less clearly in LaSb 27,28,32 by ARPES. Therefore, it is challenging to disentangle compensation from topology in relation to XMR by focusing on LaSb and LaBi.…”

Section: Introductionmentioning

confidence: 99%

Extreme magnetoresistance in the topologically trivial lanthanum monopnictide LaAs

Yang

Nummy

et al. 2017

Phys. Rev. B

View full text Add to dashboard Cite

The family of binary Lanthanum monopnictides, LaBi and LaSb, have attracted a great deal of attention as they display an unusual extreme magnetoresistance (XMR) that is not well understood. Two classes of explanations have been raised for this: the presence of non-trivial topology, and the compensation between electron and hole densities. Here, by synthesizing a new member of the family, LaAs, and performing transport measurements, Angle Resolved Photoemission Spectroscopy (ARPES), and Density Functional Theory (DFT) calculations, we show that (a) LaAs retains all qualitative features characteristic of the XMR effect but with a siginificant reduction in magnitude compared to LaSb and LaBi, (b) the absence of a band inversion or a Dirac cone in LaAs indicates that topology is insignificant to XMR, (c) the equal number of electron and hole carriers indicates that compensation is necessary for XMR but does not explain its magnitude, and (d) the ratio of electron and hole mobilities is much different in LaAs compared to LaSb and LaBi. We argue that the compensation is responsible for the XMR profile and the mobility mismatch constrains the magnitude of XMR.

show abstract

Three-dimensional band structure of LaSb and CeSb: Absence of band inversion

Cited by 59 publications

References 52 publications

Magnetization-governed magnetoresistance anisotropy in the topological semimetal CeBi

Magnetization-governed magnetoresistance anisotropy in the topological semimetal CeBi

Orbital-flop Induced Magnetoresistance Anisotropy in Rare Earth Monopnictide CeSb

Extreme magnetoresistance in the topologically trivial lanthanum monopnictide LaAs

Contact Info

Product

Resources

About