Transport properties in low carrier system CeTe2

Min, Baehyun; Moon, Eui-Seong; Im, H.J.; Hong, Sunghwan; Kwon, Yong Seung; Kim, D.L.; Ri, H.-C.

doi:10.1016/s0921-4526(01)01196-6

Cited by 23 publications

(16 citation statements)

References 6 publications

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“…The resistivity ratio ͑ c / ab ͒ between the c axis and the ab plane at T = 0.7 K is about 125. 6 The temperature dependence of the electrical resistivity is reminiscent of either a semimetal or a doped small-gap semiconductor and differs significantly from that of a good metal.…”

Section: Introductionmentioning

confidence: 99%

Optical properties of the charge-density-wave compoundCeTe2

Lee

et al. 2008

Phys. Rev. B

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The temperature dependence of the optical conductivity of CeTe 2 was obtained for the E ʈ ab plane and E ʈ c axis at photon energies ranging from terahertz to visible light. Two gap states are found in the optical conductivity spectra. The magnitudes of the gaps are estimated to be 0.448 and 0.109 eV in the E ʈ ab plane. The former is due to perfect nesting, while the latter is due to imperfect nesting. The magnitude of the gap due to perfect nesting on the c axis is evaluated to be 0.854 eV. The Drude response caused by the ungapped Fermi surface is found only on the E ʈ ab plane since CeTe 2 is a quasi-two-dimensional material. The portion of the ungapped Fermi surface across all Fermi surfaces is about 3%.

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Section: Introductionmentioning

confidence: 99%

Optical properties of the charge-density-wave compoundCeTe2

Lee

et al. 2008

Phys. Rev. B

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“…For the experimental value, we considered the tetragonal structure of CeTe 2 with the lattice constants of a = 4.47 Å and c = 18.22 Å having the ABBA-type AFM configuration. 3 The LSDA+ U method for f-electron systems would yield an improved lattice constant as compared to the LSDA method, because the LSDA+ U method describes better the bonding effect of f-electrons. Still the LSDA+ U value, although better than the LSDA value, shows a discrepancy of ϳ−8% from the experimental value.…”

Section: Resultsmentioning

confidence: 99%

“…1 With increasing magnetic field up to H = 700 Oe along the c-axis, it changes into a ferromagnetic ͑FM͒ phase manifesting a large negative magnetoresistance. 2,3 To explain the anomalous transport and magnetic properties, the magnetic polaron picture was proposed. 4,5 Recently, pressure-induced superconductivity is observed in magnetic material CeTe 1.82 with T C = 2.7 K. 6 The superconductivity is very sensitive to the Te vacancy, while the magnetic properties are retained almost identically, suggesting that the magnetic fluctuation will not be the primary source of the pairing interaction.…”

Section: Introductionmentioning

confidence: 99%

Electronic and magnetic structures of CeTe2

Shim

Youn

Park

et al. 2005

Journal of Applied Physics

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We have investigated electronic structures of CeTe2 to explore the correlation between the magnetic, charge density wave, and superconducting phases by using the local spin density approximation (LSDA) and LSDA+U (U=on-site Coulomb interaction) methods. We have found that the contribution near EF from Ce 4f states is negligible, suggesting that Ce 4f electrons are not the superconducting carriers. The total energy calculation indicates that the ABBA-type antiferromagnetic configuration is the most stable, while the stability is weakened by pressure. We have discussed the possible superconducting mechanism in the magnetic phase of CeTe1.82.

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“…High-quality RTe 2 (R = Ce, Pr) single crystals were grown by using the self-fluxed Bridgeman method [19]. The quality and the orientation of the single crystal were checked by Laue patterns.…”

Section: Experimental and Calculational Detailsmentioning

confidence: 99%

Angle-resolved and resonant photoemission spectroscopy study of the Fermi surface reconstruction in the charge density wave systemsCeTe2andPrTe2

et al. 2015

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The electronic structures of a charge density wave (CDW) system RTe 2 (R = Ce, Pr) have been investigated by employing angle-resolved photoemission spectroscopy (ARPES) and the first-principles band structure method. The R 4f hybridization peak (4f n c m−1 ) in the R 4f PES spectrum is located deeper in PrTe 2 than in CeTe 2 and R 4f spectral intensity near E F is much weaker in PrTe 2 than in CeTe 2 , implying the importance of the hybridization between Ce 4f and Te(1) 5p electrons. For both CeTe 2 and PrTe 2 , the metallic states crossing the Fermi level (E F ) are observed below the CDW transition temperature, indicating the existence of the partially ungapped Fermi surfaces (FSs). The zigzag features having the fourfold rotational symmetry are observed near the X point in the FS of CeTe 2 , but not in the FS of PrTe 2 . The tight-binding model calculations show that the zigzag FS features in CeTe 2 can be described as the CDW-induced FS reconstruction due to the 4 × 4 CDW supercell structure. The effect of the linear dichroism is observed in ARPES, suggesting that the E F -crossing states have mainly the in-plane orbital character. The photon-energy maps for the near-E F states exhibit the straight vertical dispersions for both CeTe 2 and PrTe 2 , demonstrating the dominant two-dimensional character in RTe 2 (R = Ce, Pr).

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Transport properties in low carrier system CeTe2

Cited by 23 publications

References 6 publications

Optical properties of the charge-density-wave compoundCeTe2

Optical properties of the charge-density-wave compoundCeTe2

Electronic and magnetic structures of CeTe2

Angle-resolved and resonant photoemission spectroscopy study of the Fermi surface reconstruction in the charge density wave systemsCeTe2andPrTe2

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