Dirac-like band structure of LaTESb2 (TE = Ni, Cu, and Pd) superconductors by DFT calculations

Ruszała, Piotr; Winiarski, M.; Samsel‐Czekała, M.

doi:10.1016/j.commatsci.2018.07.042

Cited by 15 publications

(8 citation statements)

References 29 publications

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“…Our results show strong evidence for the presence of Dirac fermions in LaCuSb2. In addition to this observation, there have been potentially interesting claims of intrinsic superconductivity in this system in the literature, under T = 0.9 K 39,40 , that in the context of our discovery, may present an interesting example of a material at the interface of superconductivity and topology 41 . Our measurements, however, of both resistivity and specific heat in multiple samples down to temperatures far below T = 0.9 K, have shown no anomaly consistent with a superconducting phase transition.…”

Section: Resultssupporting

confidence: 57%

Dirac fermions and possible weak antilocalization in LaCuSb2

et al. 2019

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Layered heavy-metal square-lattice compounds have recently emerged as potential Dirac fermion materials due to bonding within those sublattices. We report quantum transport and spectroscopic data on the layered Sb square-lattice material LaCuSb2. Linearly dispersing band crossings, necessary to generate Dirac fermions, are experimentally observed in the electronic band structure observed using angle-resolved photoemission spectroscopy (ARPES), along with a quasi-two-dimensional Fermi surface. Weak antilocalization that arises from two-dimensional transport is observed in the magnetoresistance, as well as regions of linear dependence, both of which are indicative of topologically non-trivial effects. Measurements of the Shubnikovde Haas (SdH) quantum oscillations show low effective mass electrons on the order of 0.065me, further confirming the presence of Dirac fermions in this material.

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Section: Resultssupporting

confidence: 57%

Dirac fermions and possible weak antilocalization in LaCuSb2

et al. 2019

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“…The contribution to the total DOS near E F originates from Sb 5p, Ce 5d and Cu 3d states. Similar dependence of DOS was obtained for the LaCuSb 2 [21]. Fig.…”

Section: Resultssupporting

confidence: 84%

Electronic States of an Antiferromagnet CeCuSb₂ Studied by Linearly Polarized Hard X-Ray Photoemission Spectroscopy

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Terashima

et al. 2020

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019)

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Band structure calculations were performed on the dense Kondo antiferromagnetic CeCuSb 2 and revealed that the essential contribution to the total density of state (DOS) around E F originates from Sb 5p-Ce 5d bands while the contribution of Ce 4f band is rather small. Polarization-dependence of CeCuSb 2 valence band HAXPES spectra was successfully observed. The experimental HAXPES results were described fairly well by the band structure calculations where the photoionization dependent cross section was taken into account.

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“…[ 10 ]). It does not show any Dirac-like bands, found for a few other rare-earth (RE) pnictides RETX 2 with X = Sb or Bi [ 28 , 29 , 30 , 31 ]. Probably it is a combination of the AFM ordering (which splits the electronic bands) with the distortion of the nets of As3 atoms from perfect squares that causes the lack of conic-like bands originating from the As 4 p electrons near the Fermi level

.…”

Section: Resultsmentioning

confidence: 99%

“…That feature can be a reason for the semiconducting-like behavior of CeAgAs 2 as well as few similar arsenides with the cis-trans distortions in As3 layers [ 10 , 35 ]. Principally, DOS at

consists of the As 4 p contributions like in other RETX 2 compounds [ 28 , 30 , 37 ]. However, the 4 p contributions originating from As1 and As2 are comparable to each other and their sum is very similar to that of the As3 atomic sites at

.…”

Section: Resultsmentioning

confidence: 99%

Antiferromagnetic Ordering and Transport Anomalies in Single-Crystalline CeAgAs2

et al. 2020

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Single crystals of the ternary cerium arsenide CeAgAs2 were grown by chemical vapor transport. They were studied by means of x-ray diffraction, magnetization, heat capacity and electrical transport measurements. The experimental research was supplemented with electronic band structure calculations. The compound was confirmed to order antiferromagnetically at the Néel temperature of 4.9 K and to undergo metamagnetic transition in a field of 0.5 T at 1.72 K. The electrical resistivity shows distinct increase at low temperatures, which origin is discussed in terms of pseudo-gap formation in the density of states at the Fermi level and quantum corrections to the resistivity in the presence of atom disorder due to crystal structure imperfections.

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Dirac-like band structure of LaTESb2 (TE = Ni, Cu, and Pd) superconductors by DFT calculations

Cited by 15 publications

References 29 publications

Dirac fermions and possible weak antilocalization in LaCuSb2

Dirac fermions and possible weak antilocalization in LaCuSb2

Electronic States of an Antiferromagnet CeCuSb₂ Studied by Linearly Polarized Hard X-Ray Photoemission Spectroscopy

Antiferromagnetic Ordering and Transport Anomalies in Single-Crystalline CeAgAs2

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Dirac-like band structure of LaTESb2 (TE = Ni, Cu, and Pd) superconductors by DFT calculations

Cited by 15 publications

References 29 publications

Dirac fermions and possible weak antilocalization in LaCuSb2

Dirac fermions and possible weak antilocalization in LaCuSb2

Electronic States of an Antiferromagnet CeCuSb2 Studied by Linearly Polarized Hard X-Ray Photoemission Spectroscopy

Antiferromagnetic Ordering and Transport Anomalies in Single-Crystalline CeAgAs2

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Product

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Dirac-like band structure of LaTESb2 (TE = Ni, Cu, and Pd) superconductors by DFT calculations

Electronic States of an Antiferromagnet CeCuSb₂ Studied by Linearly Polarized Hard X-Ray Photoemission Spectroscopy