X-ray absorption and optical spectroscopy studies of (Mg 1-xAlx)B2

H. D. Yang; H. L. Liu; Jiunn-Yuan Lin; M. X. Kuo; P. L. Ho; J. M. Chen; C. U. Jung; Min Seok Park; Sung Ik Lee

doi:10.1103/PhysRevB.68.092505

X-ray absorption and optical spectroscopy studies of (Mg _1-xAl_x)B₂

H. D. Yang^*, H. L. Liu, Jiunn-Yuan Lin, M. X. Kuo, P. L. Ho, J. M. Chen, C. U. Jung, Min Seok Park, Sung Ik Lee

^*Corresponding author for this work

Institute of Physics

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

X-ray absorption spectroscopy and optical reflectance measurements have been carried out to elucidate the evolution of the electronic structure in (Mg_1-xAl_x) B₂ for x=0.0, 0.1, 0.2, 0.3, and 0.4. The important role of B 2pσ hole states to superconductivity has been identified, and the decrease in the hole carrier number is quantitatively determined. The rate of the decrease in the hole concentration agrees well with the theoretical calculations. On the other hand, while the evolution of the electronic structure is gradual through the doping range, T_c suppression is most significant at x=0.4. These results suggest that the superstructure in (Mg_1-xAl_x)B₂, in addition to the σ holes, can affect the lattice dynamics and contributes to the T _c suppression effect. Other possible explanations like the topological change of the σ band Fermi surface are also discussed.

Original language	English
Article number	092505
Pages (from-to)	1-4
Number of pages	4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	68
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevB.68.092505
State	Published - 1 Sep 2003

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title = "X-ray absorption and optical spectroscopy studies of (Mg 1-xAlx)B2",

abstract = "X-ray absorption spectroscopy and optical reflectance measurements have been carried out to elucidate the evolution of the electronic structure in (Mg1-xAlx) B2 for x=0.0, 0.1, 0.2, 0.3, and 0.4. The important role of B 2pσ hole states to superconductivity has been identified, and the decrease in the hole carrier number is quantitatively determined. The rate of the decrease in the hole concentration agrees well with the theoretical calculations. On the other hand, while the evolution of the electronic structure is gradual through the doping range, Tc suppression is most significant at x=0.4. These results suggest that the superstructure in (Mg1-xAlx)B2, in addition to the σ holes, can affect the lattice dynamics and contributes to the T c suppression effect. Other possible explanations like the topological change of the σ band Fermi surface are also discussed.",

author = "Yang, {H. D.} and Liu, {H. L.} and Jiunn-Yuan Lin and Kuo, {M. X.} and Ho, {P. L.} and Chen, {J. M.} and Jung, {C. U.} and Park, {Min Seok} and Lee, {Sung Ik}",

year = "2003",

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doi = "10.1103/PhysRevB.68.092505",

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T1 - X-ray absorption and optical spectroscopy studies of (Mg 1-xAlx)B2

AU - Yang, H. D.

AU - Liu, H. L.

AU - Lin, Jiunn-Yuan

AU - Kuo, M. X.

AU - Ho, P. L.

AU - Chen, J. M.

AU - Jung, C. U.

AU - Park, Min Seok

AU - Lee, Sung Ik

PY - 2003/9/1

Y1 - 2003/9/1

N2 - X-ray absorption spectroscopy and optical reflectance measurements have been carried out to elucidate the evolution of the electronic structure in (Mg1-xAlx) B2 for x=0.0, 0.1, 0.2, 0.3, and 0.4. The important role of B 2pσ hole states to superconductivity has been identified, and the decrease in the hole carrier number is quantitatively determined. The rate of the decrease in the hole concentration agrees well with the theoretical calculations. On the other hand, while the evolution of the electronic structure is gradual through the doping range, Tc suppression is most significant at x=0.4. These results suggest that the superstructure in (Mg1-xAlx)B2, in addition to the σ holes, can affect the lattice dynamics and contributes to the T c suppression effect. Other possible explanations like the topological change of the σ band Fermi surface are also discussed.

AB - X-ray absorption spectroscopy and optical reflectance measurements have been carried out to elucidate the evolution of the electronic structure in (Mg1-xAlx) B2 for x=0.0, 0.1, 0.2, 0.3, and 0.4. The important role of B 2pσ hole states to superconductivity has been identified, and the decrease in the hole carrier number is quantitatively determined. The rate of the decrease in the hole concentration agrees well with the theoretical calculations. On the other hand, while the evolution of the electronic structure is gradual through the doping range, Tc suppression is most significant at x=0.4. These results suggest that the superstructure in (Mg1-xAlx)B2, in addition to the σ holes, can affect the lattice dynamics and contributes to the T c suppression effect. Other possible explanations like the topological change of the σ band Fermi surface are also discussed.

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X-ray absorption and optical spectroscopy studies of (Mg _1-xAl_x)B₂

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