Study of binary and pseudo-binary intermetallic compounds with AlB2 structure

R. L. Meng; B. Lorenz; Y. S. Wang; J. Cmaidalka; Y. Y. Sun; Y. Y. Xue; J. K. Meen; C. W. Chu

doi:10.1016/S0921-4534(02)01208-X

Study of binary and pseudo-binary intermetallic compounds with AlB₂ structure

R. L. Meng
, B. Lorenz
, Y. S. Wang
, J. Cmaidalka
, Y. Y. Sun
, Y. Y. Xue
, J. K. Meen
, C. W. Chu

Executive Vice President

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

32 Citations (Scopus)

Abstract

We have synthesized and studied the binary intermetallic compounds, AGa₂ and A[Ga_xSi_2-x] (A = Sr, Ba, Ca), which are isostructural to the newly discovered 40 K superconductor MgB₂. The binary compounds AGa₂ were found to be non-superconducting above 2 K, even though they have the same valence electron number per formula as MgB₂ and greater lattice parameters than MgB₂. However, by varying the valence electron number, they become superconducting. This result suggests that the electronic structures of this class of compounds depend on more than just the valence electron density and the lattice parameters. The theoretical prediction that the T_c of MgB₂ could be enhanced with the proper dopant to increase its carrier density or to expand the lattice could not be verified.

Original language	English
Pages (from-to)	113-116
Number of pages	4
Journal	Physica C: Superconductivity and its Applications
Volume	382
Issue number	1
DOIs	https://doi.org/10.1016/S0921-4534(02)01208-X
Publication status	Published - 2002 Oct 15

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/S0921-4534(02)01208-X

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title = "Study of binary and pseudo-binary intermetallic compounds with AlB2 structure",

abstract = "We have synthesized and studied the binary intermetallic compounds, AGa2 and A[GaxSi2-x] (A = Sr, Ba, Ca), which are isostructural to the newly discovered 40 K superconductor MgB2. The binary compounds AGa2 were found to be non-superconducting above 2 K, even though they have the same valence electron number per formula as MgB2 and greater lattice parameters than MgB2. However, by varying the valence electron number, they become superconducting. This result suggests that the electronic structures of this class of compounds depend on more than just the valence electron density and the lattice parameters. The theoretical prediction that the Tc of MgB2 could be enhanced with the proper dopant to increase its carrier density or to expand the lattice could not be verified.",

author = "Meng, \{R. L.\} and B. Lorenz and Wang, \{Y. S.\} and J. Cmaidalka and Sun, \{Y. Y.\} and Xue, \{Y. Y.\} and Meen, \{J. K.\} and Chu, \{C. W.\}",

note = "Funding Information: The work in Houston is supported in part by NSF grant no. DMR-9804325, the MRSEC Program of the National Science Foundation award no. DMR-9632667, the T.L.L. Temple Foundation, the John J. and Rebecca Moores Endowment, and the State of Texas through the Texas Center for Superconductivity at the University of Houston; and at Lawrence Berkeley Laboratory by the Director, Office of Energy Research, Office of Basic Energy Sciences, Division of Materials Sciences of the US Department of Energy under Contract No. DE-AC03-76SF00098.",

year = "2002",

month = oct,

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doi = "10.1016/S0921-4534(02)01208-X",

language = "English",

volume = "382",

pages = "113--116",

journal = "Physica C: Superconductivity and its Applications",

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T1 - Study of binary and pseudo-binary intermetallic compounds with AlB2 structure

AU - Meng, R. L.

AU - Lorenz, B.

AU - Wang, Y. S.

AU - Cmaidalka, J.

AU - Sun, Y. Y.

AU - Xue, Y. Y.

AU - Meen, J. K.

AU - Chu, C. W.

N1 - Funding Information: The work in Houston is supported in part by NSF grant no. DMR-9804325, the MRSEC Program of the National Science Foundation award no. DMR-9632667, the T.L.L. Temple Foundation, the John J. and Rebecca Moores Endowment, and the State of Texas through the Texas Center for Superconductivity at the University of Houston; and at Lawrence Berkeley Laboratory by the Director, Office of Energy Research, Office of Basic Energy Sciences, Division of Materials Sciences of the US Department of Energy under Contract No. DE-AC03-76SF00098.

PY - 2002/10/15

Y1 - 2002/10/15

N2 - We have synthesized and studied the binary intermetallic compounds, AGa2 and A[GaxSi2-x] (A = Sr, Ba, Ca), which are isostructural to the newly discovered 40 K superconductor MgB2. The binary compounds AGa2 were found to be non-superconducting above 2 K, even though they have the same valence electron number per formula as MgB2 and greater lattice parameters than MgB2. However, by varying the valence electron number, they become superconducting. This result suggests that the electronic structures of this class of compounds depend on more than just the valence electron density and the lattice parameters. The theoretical prediction that the Tc of MgB2 could be enhanced with the proper dopant to increase its carrier density or to expand the lattice could not be verified.

AB - We have synthesized and studied the binary intermetallic compounds, AGa2 and A[GaxSi2-x] (A = Sr, Ba, Ca), which are isostructural to the newly discovered 40 K superconductor MgB2. The binary compounds AGa2 were found to be non-superconducting above 2 K, even though they have the same valence electron number per formula as MgB2 and greater lattice parameters than MgB2. However, by varying the valence electron number, they become superconducting. This result suggests that the electronic structures of this class of compounds depend on more than just the valence electron density and the lattice parameters. The theoretical prediction that the Tc of MgB2 could be enhanced with the proper dopant to increase its carrier density or to expand the lattice could not be verified.

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JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - 1

ER -

Study of binary and pseudo-binary intermetallic compounds with AlB₂ structure

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