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Volumn 59, Issue 5, 1999, Pages 3870-3878

Antiferromagnetic ordering states of oxygen-deficient (formula presented) and (formula presented) single crystals

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EID: 0041615565     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.59.3870     Document Type: Article
Times cited : (6)

References (61)
  • 2
    • 85038270007 scopus 로고    scopus 로고
    • Th. Wolf, H. Küpfer, and H. Wühl, in Proceedings of the 8th International Workshop on Critical Currents in Superconductors, Kitakyushu, Japan, 1996, edited by T. Matshushita and K. Yamafuji (World Scientific, Singapore, 1996), p. 411
    • Th. Wolf, H. Küpfer, and H. Wühl, in Proceedings of the 8th International Workshop on Critical Currents in Superconductors, Kitakyushu, Japan, 1996, edited by T. Matshushita and K. Yamafuji (World Scientific, Singapore, 1996), p. 411.
  • 43
    • 85038313798 scopus 로고    scopus 로고
    • G. M. Sheldrick, computer code SHELX76, University of Cambridge, England, 1976
    • G. M. Sheldrick, computer code SHELX76, University of Cambridge, England, 1976.
  • 44
    • 85038287789 scopus 로고    scopus 로고
    • Laboratoire commun CEA-CNRS
    • Laboratoire commun CEA-CNRS.
  • 46
  • 60
    • 85038347666 scopus 로고    scopus 로고
    • Due to the well-known influence of magnetic (Formula presented) dopants in the (Formula presented) system, the possibility of contamination by impure chemicals or by crucible corrosion may be considered as the origin of the (Formula presented) differences of nominally (Formula presented) crystals (Table III). However, to explain the high-(Formula presented) values of the (Formula presented) in Refs. 4 and 5, a Fe contamination of (Formula presented) would be necessary according to the (Formula presented) phase diagrams of Mirebeau et al. (Ref. 17) and Lyubutin et al. (Ref. 19). Such a degree of contamination with (Formula presented) or (Formula presented) would have been easily detected by the electron-probe microanalysis and Rutherford backscattering employed by these authors. However, the precision in determining the Nd/Ba ratio by microprobe techniques requires excellent standards and is hampered by an overlap of the K lines of Nd and Ba, so that the weaker L lines have to be taken. The Rutherford backscattering edges of Nd and Ba can be separated only with difficulties, as the difference in atomic mass is only about 5%. Thus we can show that these methods are hardly sensitive enough to determine Nd doping on Ba sites unless very special measures are taken
    • Due to the well-known influence of magnetic (Formula presented) dopants in the (Formula presented) system, the possibility of contamination by impure chemicals or by crucible corrosion may be considered as the origin of the (Formula presented) differences of nominally (Formula presented) crystals (Table III). However, to explain the high-(Formula presented) values of the (Formula presented) in Refs. 4 and 5, a Fe contamination of (Formula presented) would be necessary according to the (Formula presented) phase diagrams of Mirebeau et al. (Ref. 17) and Lyubutin et al. (Ref. 19). Such a degree of contamination with (Formula presented) or (Formula presented) would have been easily detected by the electron-probe microanalysis and Rutherford backscattering employed by these authors. However, the precision in determining the Nd/Ba ratio by microprobe techniques requires excellent standards and is hampered by an overlap of the K lines of Nd and Ba, so that the weaker L lines have to be taken. The Rutherford backscattering edges of Nd and Ba can be separated only with difficulties, as the difference in atomic mass is only about 5%. Thus we can show that these methods are hardly sensitive enough to determine Nd doping on Ba sites unless very special measures are taken.


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