Anisotropic magnetization and resistivity of single crystalline RNi1-xBi2 +/- y (R = La-Nd, Sm, Gd-Dy)
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Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.
For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.
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Abstract
We present a detailed study of RNi1−xBi2±y (R = La–Nd, Sm, Gd–Dy) single crystals by measurements of stoichiometry and temperature dependent magnetic susceptibility, magnetization, and electrical resistivity. This series forms with partial Ni occupancy, 0.72 ⩽ (1−x) ⩽ 0.84, as well as a variable Bi occupancy, 1.76 ⩽ (2±y) ⩽ 2.14. For R = Ce–Nd, Gd–Dy, the RNi1−xBi2±y compounds show local-moment like behavior and order antiferromagnetically at low temperatures. Determination of anisotropies as well as antiferromagnetic ordering temperatures for RNi1−xBi2±y (R = Ce–Nd, Sm, Gd–Dy) have been made. Crystalline samples from this family exhibit minority, second phase superconductivity at low temperatures, which can be associated with Ni–Bi and Bi contamination. No evidence of bulk superconductivity has been observed.
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This is a manuscript of an article published as Lin, Xiao, Warren E. Straszheim, Sergey L. Bud’ko, and Paul C. Canfield. "Anisotropic magnetization and resistivity of single crystalline RNi1− xBi2±y (R= La–Nd, Sm, Gd–Dy)." Journal of Alloys and Compounds 554 (2013): 304-311. DOI: 10.1016/j.jallcom.2012.11.138. Posted with permission.