Longitudinal and transverse magnetoresistance of SrTiO<sub>3</sub>with a single closed Fermi surface

Awashima, Yudai; Fuseya, Yuki

doi:10.1088/1361-648x/ab1b05

Cited by 9 publications

(15 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This result suggests that the presence of the two-dimensional hollow Fermi surface, in which possible Dirac dispersion has been proposed, causes little influence on the emergence of a negative contribution. On the other hand, recent theoretical study showed that a negative magnetoresistance effect can arise from the warp of the Fermi surface from the perfect sphere, regardless of the nontrivial band topology [30]. Thus, more details of the Fermi surfaces in both CDW phase and normal metallic phase under high pressure are indispensable to discuss the origin of negative longitudinal magnetoresistance.…”

Section: Resultsmentioning

confidence: 99%

Successive destruction of charge density wave states by pressure in LaAgSb2

et al. 2021

View full text Add to dashboard Cite

We comprehensively studied the magnetotransport properties of LaAgSb 2 under high pressure up to 4 GPa, which showed unique successive charge density wave (CDW) transitions at T CDW1 ∼ 210 K and T CDW2 ∼ 190 K at ambient pressure. With the application of pressure, both T CDW1 and T CDW2 were suppressed and disappeared at the critical pressures of P CDW1 = 3.0-3.4 GPa and P CDW2 = 1.5-1.9 GPa, respectively. At P CDW1 , the Hall conductivity showed a steplike increase, which is consistently understood by the emergence of a two-dimensional hollow Fermi surface at P CDW1 . We also observed a significant negative magnetoresistance effect when the magnetic field and current were applied parallel to the c axis. The negative contribution was observed in the whole pressure region from 0 to 4 GPa. Shubnikov-de Haas (SdH) oscillation measurements under pressure directly showed the changes in the Fermi surface across the CDW phase boundaries. In P < P CDW2 , three major oscillation components, α, β, and γ , were identified, whose frequencies were increased by application of pressure. The increment rate of these frequencies was considerably larger than that expected from the shrinkage of lattice constant, indicating the unignorable band modification under pressure. In the normal metallic phase above P > P CDW1 , we observed a single frequency of ∼48 T with a cyclotron effective mass of 0.066m 0 , whose cross section in the reciprocal space corresponded to only 0.22% of the first Brillouin zone. Besides, we observed another oscillation component with frequency of ∼9.2 T, which is significantly enhanced in the limited pressure range of P CDW2 < P < P CDW1 . The amplitude of this oscillation was anomalously suppressed in the high-field and low-temperature region, which cannot be explained by the conventional Lifshitz-Kosevich formula.

show abstract

Section: Resultsmentioning

confidence: 99%

Successive destruction of charge density wave states by pressure in LaAgSb2

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Despite this, there is a recent theoretical prediction, that a negative Gaussian curvature of the Fermi surface can cause a negative LMR [29].…”

Section: Possible Phenomena Causing a Magnetoresistancementioning

confidence: 98%

Orbital effect and weak localization in the longitudinal magnetoresistance of Weyl semimetals NbP, NbAs, TaP, and TaAs

Naumann

Arnold

Bachmann

et al. 2020

Phys. Rev. Materials

View full text Add to dashboard Cite

Weyl semimetals such as the TaAs family (TaAs, TaP, NbAs, NbP) host quasiparticle excitations resembling the long sought after Weyl fermions at special band-crossing points in the band structure denoted as Weyl nodes. They are predicted to exhibit a negative longitudinal magnetoresistance (LMR) due to the chiral anomaly if the Fermi energy is sufficiently close to the Weyl points. However, current jetting effects, i.e. current inhomogeneities caused by a strong, field-induced conductivity anisotropy in semimetals, have a similar experimental signature and therefore have hindered a determination of the intrinsic LMR in the TaAs family so far. This work investigates the longitudinal magnetoresistance of all four members of this family along the crystallographic a and c direction. Our samples are of similar quality as those previously studied in the literature and have a similar chemical potential as indicated by matching quantum oscillation (QO) frequencies. Care was taken to ensure homogeneous currents in all measurements. As opposed to previous studies where this was not done, we find a positive LMR that saturates in fields above 4 T in TaP, NbP and NbAs for B||c. Using Fermi-surface geometries from band structure calculations that had been confirmed by experiment, we show that this is the behaviour expected from a classical purely orbital effect, independent on the distance of the Weyl node to the Fermi energy. The TaAs family of compounds is the first to show such a simple LMR without apparent influences of scattering anisotropy. In configurations where the orbital effect is small, i.e. for B||a in NbAs and NbP, we find a nonmonotonous LMR including regions of negative LMR.We discuss a weak antilocalisation scenario as an alternative interpretation than the chiral anomaly for these results, since it can fully account for the overall field dependence. arXiv:1911.04775v1 [cond-mat.str-el]

show abstract

“…The linear magnetoresistance is expected to occur in the quantum limit state of a system having a linear energy dispersion [29] such as Dirac and Weyl semimetals. However, the power of magnetoresistance can be affected by disorder effects [30,31] and also the curvature of the relevant Fermi surface [32]. We also note that the data shown in Fig.…”

Section: Resultsmentioning

confidence: 60%

Magnetotransport properties of tellurium under extreme conditions

Akiba

Kobayashi

et al. 2020

Phys. Rev. B

View full text Add to dashboard Cite

This study investigates the transport properties of a chiral elemental semiconductor tellurium (Te) under magnetic fields and pressure. Application of hydrostatic pressure reduces the resistivity of Te, while its temperature dependence remains semiconducting up to 4 GPa, contrary to recent theoretical and experimental studies. Application of higher pressure causes structural as well as semiconductor-metal transitions. The resulting metallic phase above 4 GPa exhibits superconductivity at 2 K along with a noticeable linear magnetoresistance effect. On the other hand, at ambient pressure, we identified metallic surface states on the as-cleaved (1010) surfaces of Te. The nature of these metallic surface states has been systematically studied by analyzing quantum oscillations observed in high magnetic fields. We clarify that a well-defined metallic surface state exists not only on chemically etched samples that were previously reported, but also on as-cleaved ones.

show abstract

Longitudinal and transverse magnetoresistance of SrTiO₃with a single closed Fermi surface

Cited by 9 publications

References 29 publications

Successive destruction of charge density wave states by pressure in LaAgSb2

Successive destruction of charge density wave states by pressure in LaAgSb2

Orbital effect and weak localization in the longitudinal magnetoresistance of Weyl semimetals NbP, NbAs, TaP, and TaAs

Magnetotransport properties of tellurium under extreme conditions

Contact Info

Product

Resources

About

Longitudinal and transverse magnetoresistance of SrTiO3with a single closed Fermi surface

Cited by 9 publications

References 29 publications

Successive destruction of charge density wave states by pressure in LaAgSb2

Successive destruction of charge density wave states by pressure in LaAgSb2

Orbital effect and weak localization in the longitudinal magnetoresistance of Weyl semimetals NbP, NbAs, TaP, and TaAs

Magnetotransport properties of tellurium under extreme conditions

Contact Info

Product

Resources

About

Longitudinal and transverse magnetoresistance of SrTiO₃with a single closed Fermi surface