Barium contributions to the valence electronic structure of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, PrBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, and other barium-containing compounds
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
- University of Tennessee, Knoxville, Tennessee 37996 (United States)
- Tulane University, New Orleans, Louisiana 70118 (United States)
Monochromatic photon beams were used to excite barium {ital N}{sub IV,V} soft x-ray emission spectra from YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, PrBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, BaF{sub 2}, and BaTiO{sub 3}. Near threshold excitation was used to demonstrate that small contributions to the barium {ital N}{sub V} and {ital N}{sub IV} emission spectra in the energy region above the 5{ital p}{r_arrow}4{ital d} core-core transitions do not arise as satellite emission from transitions in multiply excited atoms but rather occur as a result of transitions from the valence states. The emission spectrum of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} and PrBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} reveals a contribution to the electronic density of states at the barium site in the region near the Fermi level. The YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} compound is a superconductor and PrBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} is an insulator. It has been proposed that the difference between them is due to mixing of praseodymium and barium among the sites occupied by yttrium and barium, with an accompanying change in electronic structure. However, our measurements indicate that the barium partial density of states for the two compounds are essentially identical.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 251127
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 52, Issue 13; Other Information: PBD: 1 Oct 1995
- Country of Publication:
- United States
- Language:
- English
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