Resistivity plateau and extreme magnetoresistance in LaSb

Tafti, Fazel; Gibson, Quinn; Kushwaha, Satya; Haldolaarachchige, Neel; Cava, R. J.

doi:10.1038/nphys3581

Cited by 326 publications

(409 citation statements)

References 37 publications

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“…4D for LaBi. Similar analysis gives F 0 = 212 ± 5 T for LaSb (17). The principal frequencies for LaSb and LaBi do not match the known frequencies of tin and indium, ruling out flux inclusion (21,22).…”

Section: Significancementioning

confidence: 60%

“…Ref. 17 shows that the magnitude of XMR is sensitive to the residual resistivity ratio (RRR), i.e., to the sample quality. We quote RRR values for the LaSb and the LaBi samples in Fig.…”

Section: Significancementioning

confidence: 99%

“…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)(10)(11), and layered semimetals such as WTe 2 , NbSb 2 , or PtSn 4 (12)(13)(14)(15)(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.…”

mentioning

confidence: 99%

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Temperature−field phase diagram of extreme magnetoresistance

Tafti

Gibson

Kushwaha

et al. 2016

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

104

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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: Significancementioning

confidence: 60%

“…Ref. 17 shows that the magnitude of XMR is sensitive to the residual resistivity ratio (RRR), i.e., to the sample quality. We quote RRR values for the LaSb and the LaBi samples in Fig.…”

Section: Significancementioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Temperature−field phase diagram of extreme magnetoresistance

Tafti

Gibson

Kushwaha

et al. 2016

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

104

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“…[1][2][3][4][5][6] Here magnetoresistance is defined by the ratio R(H)/R(0), where R is the electrical resistance and H is the applied magnetic field. In transition metal oxides, both Giant and Colossal Magnetoresistance have been observed 7,8 and implemented in non-volatile magnetic memory, 9 as magnetic sensors, 10 as well as proposed spin valves in spintronics.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the atomic orbital composition of the near-fermi-level electronic states in the lanthanum monopnictides LaBi, LaSb, and LaAs

et al. 2018

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Recent debates in the literature over the relationship between topology and Extreme Magnetoresistance (XMR) have drawn attention to the Lanthanum Monopnictide family of binary compounds. Angle resolved photoemission spectroscopy (ARPES) is used to measure the electronic structure of the XMR topological semimetal candidates LaBi, LaSb, and LaAs. The orbital content of the near-E F states in LaBi and LaSb are extracted using varying photon polarizations and both dominant d and p bands are observed near X. The measured bulk bands are shifted in energy when compared to the results of Density Functional Calculations. This disagreement is minor in LaBi, but large in LaSb and LaAs. The measured bulk band structure of LaBi shows a clear band inversion and puts LaBi in the υ = 1 class of Topological Insulators (or semimetals), as predicted by calculations and consistent with the measured Dirac-like surface states. LaSb is on the verge of a band inversion with a less-clear case for any distinctly topological surface states and in disagreement with calculations. Lastly, these same bands in LaAs are clearly non-inverted implying its topological triviality and demonstrating a topological phase transition in the Lanthanum monopnictides. Using a wide range of photon energies the true bulk states are cleanly disentangled from the various types of surface states which are present. These surface states exist due to surface projections of bulk states in LaSb and for topological reasons in LaBi.

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“…XMR materials are observed to be semi-metals with nearly compensated electron and hole carriers. Recently, XMR has also been reported in rare earth monopnictides such as LaSb and LaBi [18][19][20][21][22].…”

mentioning

confidence: 99%

Observation of Dirac-like semi-metallic phase in NdSb

Neupane

Hosen

Belopolski

et al. 2016

J. Phys.: Condens. Matter

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The search of new topological phases of matter is one of the new directions in condensed matter physics. Recent experimental realizations of Dirac semimetal phases pave the way to look for other exotic phases of matter in real materials. Here we present a systematic angle-resolved photoemission spectroscopy (ARPES) study of NdSb, a potential candidate for hosting a Dirac semi-metal phase. Our studies reveal two hole-like Fermi surface pockets present at the zone center (Γ) point as well as two elliptical electron-pockets present in the zone corner (X) point of the Brillouin zone (BZ). Interestingly, Dirac-like linearly dispersive states are observed about the zone corner (X) point in NdSb. Our first principles calculations agree with the experimentally observed bands at the Γ point. Moreover, the Dirac-like state observed in NdSb may be a novel correlated state, not yet predicted in calculations. Our study opens a new direction to look for Dirac semi-metal states in other members of the rare earth monopnictide family. PACS numbers:The discovery of topological Dirac and Weyl materials have gained intense research interest both theoretically and experimentally as they can host many different novel phenomena such as linear bulk band crossings, surface Fermi arcs, chiral anomalies, perfect compensation between electron and hole carriers, resistivity plateaus, Shubnikov-de Hass (SdH) oscillations, etc [1][2][3][4][5][6][7][8][9][10][11][12][13]. These semi-metals (not insulators) show that the conduction and valence bands disperse linearly through the crossing points in all directions throughout the three-dimensional momentum space. Bands are doubly degenerate in Dirac semi-metals, whereas the degeneracy is lifted by breaking either the time-reversal or inversion symmetry in Weyl semi-metals. The linear band crossing at the Dirac point in a Dirac semi-metal is protected by the crystalline symmetry. Interestingly, extreme magnetoresistance (XMR) was found in Dirac semi-metals such as in Na Rare earth monopnictides possess the simple NaCltype structure (see Figure 1(a)). Using first principles calculations, the topological semi-metal phases have been predicted in rare earth monopnictides with the presence of inversion symmetry [23]. Due to the possibility of a topological Dirac semi-metal phase in rare earth monopnictides, research interest on these materials is growing. However, a detailed experimental electronic structure of these materials has not yet been reported. As a momentum-resolved probe of electronic structure, which can isolate the surface from bulk states, angle resolved photoemission spectroscopy (ARPES) can provide convincing evidence of topological Dirac semi-metal phases. We choose neodymium antimonide (NdSb) for our electronic structure measurement, which exhibits unique structural, electronic, magnetic and phonon properties [24,25]. Furthermore, the presence of the f -electrons in NdSb may open a new possibility of revealing correlated topological phases which are absent in conventional topological i...

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Resistivity plateau and extreme magnetoresistance in LaSb

Cited by 326 publications

References 37 publications

Temperature−field phase diagram of extreme magnetoresistance

Temperature−field phase diagram of extreme magnetoresistance

Measurement of the atomic orbital composition of the near-fermi-level electronic states in the lanthanum monopnictides LaBi, LaSb, and LaAs

Observation of Dirac-like semi-metallic phase in NdSb

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