Effect of hydrostatic and chemical pressure on the exchange interaction in magnetic borocarbide superconductors

H. Michor; M. El-Hagary; L. Naber; E. Bauer; G. Hilscher

doi:10.1103/PhysRevB.61.R6487

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Effect of hydrostatic and chemical pressure on the exchange interaction in magnetic borocarbide superconductors

H. Michor, M. El-Hagary, L. Naber, E. Bauer, G. Hilscher

DOI 10.1103/PhysRevB.61.R6487 · Physical Review B

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Abstract

The investigation of pair-breaking effects in magnetic rare-earth nickel borocarbide superconductors reveals a considerable increase of the magnetic exchange integral Jsf by hydrostatic as well as chemical pressure. In both, Jsf is governed by the R−C distance (or lattice constant a) and is described quantitatively by a simple phenomenological model. Thereby, just two parameters Jsf0=31 meV and ΔJsf/Δa=165 meV/Å explain well the influence of chemical pressure upon the initial depression rates of Tc in solid solutions R1−x′RxNi2B2C with R=Gd, Tb, Dy, Ho and R′=Y and Lu.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	16.5	Pressure unresolved	midpoint
YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15.5	Pressure unresolved	midpoint
Y0.95Gd0.05Ni2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	13.7	Pressure unresolved	midpoint
Y0.60Dy0.40Ni2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10.25	Pressure unresolved	midpoint
Y0.85Gd0.15Ni2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10.2	Pressure unresolved	midpoint
Y0.80Gd0.20Ni2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8	Pressure unresolved	midpoint