Determination of the fermi surface of monoclinic SrAs3 by Shubnikov dehaas effect

Zhou, Bangdi; Gmelin, E.; Bauhofer, W.

doi:10.1016/0038-1098(84)90963-3

Cited by 11 publications

(4 citation statements)

References 5 publications

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“…Similar behaviors were also suggested in ref. [41][42][43]. These observations can be understood by looking at the band structure in Fig.…”

Section: Sample Characterizationmentioning

confidence: 85%

Evidence for a Dirac nodal-line semimetal in SrAs3

Guo

et al. 2018

Science Bulletin

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Dirac nodal-line semimetals with the linear bands crossing along a line or loop, represent a new topological state of matter. Here, by carrying out magnetotransport measurements and performing first-principle calculations, we demonstrate that such a state has been realized in highquality single crystals of SrAs 3 . We obtain the nontrivial π Berry phase by analysing the Shubnikov-de Haas quantum oscillations. We also observe a robust negative longitudinal magnetoresistance induced by the chiral anomaly. Accompanying first-principles calculations identify that a single hole pocket enclosing the loop nodes is responsible for these observations.

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“…Similar behaviors were also suggested in ref. [41][42][43]. These observations can be understood by looking at the band structure in Fig.…”

Section: Sample Characterizationmentioning

confidence: 85%

Evidence for a Dirac nodal-line semimetal in SrAs3

Guo

et al. 2018

Science Bulletin

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“…Among these compounds, only SrAs 3 shows a strongly topological nature at ambient pressure, while others need extra compressing 20 . SrAs 3 displays semimetallic behavior with the hole carriers dominating 21,22 . Previously, unusual galvanomagnetic properties and a first-order longitudinal Hall effect have been found in SrAs 3 23 , and quantum oscillation experiments have been applied to map out the shape of the Fermi surface, finding two asymmetric, quasi-ellipsoidal Fermi-bodies as well as light cyclotron effective mass 22 .…”

Section: Introductionmentioning

confidence: 99%

“…SrAs 3 displays semimetallic behavior with the hole carriers dominating 21,22 . Previously, unusual galvanomagnetic properties and a first-order longitudinal Hall effect have been found in SrAs 3 23 , and quantum oscillation experiments have been applied to map out the shape of the Fermi surface, finding two asymmetric, quasi-ellipsoidal Fermi-bodies as well as light cyclotron effective mass 22 . Recent magnetotransport measurements on SrAs 3 single crystals found a nontrivial Berry phase and a robust negative longitudinal magnetoresistance (MR) induced by the chiral anomaly, which indicates the presence of topological properties in SrAs 3 24,25 .…”

Section: Introductionmentioning

confidence: 99%

Pressure-induced superconductivity and topological phase transitions in the topological nodal-line semimetal SrAs3

et al. 2020

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Topological nodal-line semimetals (TNLSMs) are materials whose conduction and valence bands cross each other, meeting a topologically protected closed loop rather than discrete points in the Brillouin zone (BZ). The anticipated properties for TNLSMs, include drumhead-like nearly flat surface states, unique Landau energy levels, special collective modes, long-range Coulomb interactions, or the possibility of realizing high-temperature superconductivity. Recently, SrAs 3 has been theoretically proposed and then experimentally confirmed to be a TNLSM. Here, we report high-pressure experiments on SrAs 3 , identifying a Lifshitz transition below 1 GPa and a superconducting transition accompanied by a structural phase transition above 20 GPa. A topological crystalline insulator (TCI) state is revealed by means of density functional theory (DFT) calculations on the emergent high-pressure phase. As the counterpart of topological insulators, TCIs possess metallic boundary states protected by crystal symmetry, rather than time reversal. In consideration of topological surface states (TSSs) and helical spin texture observed in the high-pressure state of SrAs 3 , the superconducting state may be induced in the surface states, and is most likely topologically nontrivial, making pressurized SrAs 3 a strong candidate for topological superconductor.

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“…On the other hand, the anisotropic Fermi surface of SrAs 3 could give rise to anisotropic RKKY interactions. 17 Finally, an anisotropic contribution to the superexchange interaction can arise through spin-orbit coupling of the anions for which the orbital momentum L^0 in the excited state. 18 This source of anisotropy could be presented even for x = 0.1, since for this concentration only 25% of the Eu 2 + ions are isolated with respect to nearest and next-nearest neighbors.…”

mentioning

confidence: 99%

Magnetic Susceptibility and Specific Heat of an Anisotropic Spin-Glass:EuxSr1−x
Schröder
¹
,
Löhneysen
²
,
Bauhofer
³

1986
Phys. Rev. Lett.
Self Cite
24
3
10
0
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The magnetic susceptibility of Eu x Srix As3 spin-glasses is highly anisotropic: For x = 0.24 and x = 0.3 the longitudinal and transverse susceptibilities (with respect to the orientation of magnetic moments in antiferromagnetic EuAs 3 ) exhibit spin-glass-like maxima at different temperatures, with the longitudinal freezing occurring at higher temperature. The magnetic specific heat displays a temperature dependence not previously found in spin-glasses, C M^a TQxp ( -bE/k^T). This indicates a gap around zero energy in the density of states of magnetic excitations, which arises from the anisotropy.PACS numbers: 75.30. Gw, 75.50.Ee Anisotropy in spin-glasses has been of much interest recently. In metallic spin-glasses, the Dzyaloshinsky-Moriya interaction leads to an anisotropy which is believed to be responsible for the remanent magnetization remaining in the direction of the initially applied magnetic field. 1 In addition, single-ion anisotropics may exist which lead to a preferred orientation of magnetic moments with respect to the crystal axes. An exemplary system is dilute Mn-based spin-glasses with different hexagonal hosts, where Heisenberg-like, XK-like, and Ising-like spin-glass behavior was observed. 2 The mean-field phase diagram for anisotropic spin-glasses (with infinite-range interactions) predicts subsequent freezing with decreasing temperature of longitudinal and transverse degrees of freedom for weak positive uniaxial anisotropy, D > 0 (and vice versa for D < 0). M However, experimental evidence for this interesting feature has been evasive. 5 Here we report on a new anisotropic spin-glass EUxSrj-^Asa. Anisotropic behavior with subsequent longitudinal and transverse freezing occurs in this system with welldefined Eu 2+ moments (S«-j, L«0), where-for intermediate and high Eu 2+ concentrations-the magnetic interactions are predominantly of short range.Another current problem in spin-glass research is the nature of low-lying excitations in spin-glasses. As is well known, the magnetic excitations lead to a specific heat which below the freezing temperature varies roughly linearly with temperature. The *'linear specific heat" is thought to be a characteristic and general feature of disordered solids, arising from a constant density of states of the elementary excitations near zero energy, and appearing in "real" glasses 6 and in both metallic 7 and nonmetallic 8 spin-glasses. In this paper a distinctly different temperature dependence of the specific heat, not previously observed in spinglasses, is reported for Eu^Sr^^Asa: Over a wide range of concentrations (0.10^x^0.50) and temperatures (one order of magnitude) the magnetic specific heat can be represented by C M = aTThis gives strong evidence for the existence of a gap in the zero-field density of states which is a new feature of spin-glasses, 9 and is probably related to the anisotropy.EuAsj is a monoclinic semimetal which undergoes two successive magnetic transitions. 10 At 11.3 K a transition to an incommensurate magnetic structure occurs which i...

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Determination of the fermi surface of monoclinic SrAs3 by Shubnikov dehaas effect

Cited by 11 publications

References 5 publications

Evidence for a Dirac nodal-line semimetal in SrAs3

Evidence for a Dirac nodal-line semimetal in SrAs3

Pressure-induced superconductivity and topological phase transitions in the topological nodal-line semimetal SrAs3

Magnetic Susceptibility and Specific Heat of an Anisotropic Spin-Glass:EuxSr1−x
Schröder
¹
,
Löhneysen
²
,
Bauhofer
³

1986
Phys. Rev. Lett.
Self Cite
24
3
10
0
View full text Add to dashboard Cite

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Determination of the fermi surface of monoclinic SrAs3 by Shubnikov dehaas effect

Cited by 11 publications

References 5 publications

Evidence for a Dirac nodal-line semimetal in SrAs3

Evidence for a Dirac nodal-line semimetal in SrAs3

Pressure-induced superconductivity and topological phase transitions in the topological nodal-line semimetal SrAs3

Magnetic Susceptibility and Specific Heat of an Anisotropic Spin-Glass:EuxSr1−xSchröder1, Löhneysen2, Bauhofer3 1986Phys. Rev. Lett.Self Cite243100View full textAdd to dashboardCite

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Magnetic Susceptibility and Specific Heat of an Anisotropic Spin-Glass:EuxSr1−x
Schröder
¹
,
Löhneysen
²
,
Bauhofer
³

1986
Phys. Rev. Lett.
Self Cite
24
3
10
0
View full text Add to dashboard Cite