Electronic structure of Ni-substituted Y(Ni1−xMx)2B2C superconductors

Z. Zeng; D. E. Ellis; Diana Guenzburger; E. M. Baggio-Saitovitch

doi:10.1103/PhysRevB.53.6613

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Electronic structure of Ni-substituted Y(Ni1−xMx)2B2C superconductors

Z. Zeng, D. E. Ellis, Diana Guenzburger, E. M. Baggio-Saitovitch

DOI 10.1103/PhysRevB.53.6613 · Physical Review B

T1

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Abstract

The substitution of Ni by the transition metals Fe, Co, and Ru in YNi2B2C is analyzed using the self-consistent local-density embedded-cluster approach. Changes of partial densities of states, charge density, and bond order are examined to elucidate bonding structure and the interplay between covalent, ionic, and metallic interactions in these highly anisotropic superconductors. Impurity induced modifications in distribution and composition of states near the Fermi level are discussed in terms of the observed drop in Tc with impurity concentration. Electric-field gradients are obtained at the central site. In the case of iron substitution with concentration x≤0.1, electric quadrupole splitting is compared with Mössbauer experimental results. © 1996 The American Physical Society.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15.6	Pressure not reported	unknown
YPt2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10	Pressure not reported	unknown
YPd2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	23	Pressure not reported	unknown
YCo2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0	Pressure not reported	unknown
Y(Ni0.97Fe0.03)2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10.3	Pressure not reported	unknown
Y(Ni0.93Fe0.07)2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.8	Pressure not reported	unknown
Y(Ni0.97Co0.03)2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	11.7	Pressure not reported	unknown
Y(Ni0.93Co0.07)2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.9	Pressure not reported	unknown
Y(Ni0.97Ru0.03)2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.9	Pressure not reported	unknown
Y(Ni0.95Ru0.05)2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.1	Pressure not reported	unknown