Synthesis and superconductivity of intermetallic compounds Y{sub 2}Ni{sub {ital x}}B{sub 8{minus}{ital x}}C{sub 2}, YNi{sub {ital x}}Cu{sub 2{minus}{ital x}}B{sub 2}C, and YNi{sub {ital x}}Cu{sub 2{minus}{ital x}}Si{sub 2}C
- Department of Physics, University of New Orleans, New Orleans, Louisiana 70148 (United States)
- Department of Chemistry, University of New Orleans, New Orleans, Louisiana 70148 (United States)
Borocarbide and silicocarbide intermetallic Y{sub 2}Ni{sub {ital x}}B{sub 8{minus}{ital x}}C{sub 2} ({ital x}=1, 2, 3, 5), YNiCuB{sub 2}C, and YNi{sub {ital x}}Cu{sub 2{minus}{ital x}}Si{sub 2}C ({ital x}=0, 2) were prepared and their superconductivity was studied. The results indicated that with the change of the ratio of Ni to B in Y{sub 2}Ni{sub {ital x}}B{sub 8{minus}{ital x}}C{sub 2}, secondary phases were introduced into YNi{sub 2}B{sub 2}C phase. A {ital T}{sub {ital c}} of 15.0 K was observed for the compounds {ital x}=2, 3, and 5, which originated from the major phase YNi{sub 2}B{sub 2}C in these samples. Partial substitution of Ni by Cu reduced the {ital T}{sub {ital c}} to 11.0 K for YNiCuB{sub 2}C. For Si substitution system, no bulk superconductivity was found in YNi{sub 2}Si{sub 2}C and YCu{sub 2}Si{sub 2}C. But a minor superconducting phase ({ital T}{sub {ital c}}{approximately}4 K) with a volume fraction of the order of near 1{percent} was observed in them. It was noticed that for the temperature-dependent magnetization of superconducting compounds containing Ni, a significant difference between zero-field cooling and field cooling curves before {ital T}{sub {ital c}} was always observed, which was tentatively attributed to Ni-containing impurity. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 280076
- Report Number(s):
- CONF-951101-; ISSN 0021-8979; TRN: 96:018968
- Journal Information:
- Journal of Applied Physics, Vol. 79, Issue 8; Conference: 40. conference on magnetism and magnetic materials, Philadelphia, PA (United States), 6-9 Nov 1995; Other Information: PBD: Apr 1996
- Country of Publication:
- United States
- Language:
- English
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