Pressure effects in PrT2B2C (T = Co, Ni, Pt): Applied and chemical pressure

TL;DR

This study investigates how applied and chemical pressures influence magnetic and superconducting properties in PrT2B2C compounds with T = Co, Ni, Pt, revealing pressure-dependent suppression of magnetic scattering and superconductivity.

Contribution

It provides new insights into pressure effects on magnetic correlations and superconductivity in PrT2B2C compounds with different transition metals.

Findings

Magnetic correlations at 10K and 4K in Pr(Co, Ni)2B2C at ambient pressure.

Pressure suppresses magnetic scattering more effectively in PrCo2B2C.

Superconductivity at 6K in PrPt2B2C is degraded under pressure.

Abstract

High-pressure electrical resistivity, r(T), measurements on intermetallic Pr(Co, Ni, Pt)2B2C compounds were performed down to 2K. At room pressure the r(T) in a-b direction curves for the non superconducting Pr(Co, Ni)2B2C compounds exhibit magnetic correlations at about 10 and 4 K, respectively. At low temperatures, PrCo2B2C shows a large spin-dependent electron scattering in comparison to PrNi2B2C. Under applied pressure the magnetic scattering tends to be suppressed more effectively in PrCo2B2C than in PrNi2 B2C. The low temperature behavior of r(T,P) for PrNi2B2C and PrCo2B2C suggests a spin fluctuations mechanism. In the other hand PrPt2B2C compound shows superconductivity at about 6 K and under pressure its superconducting transition temperature tends to be degraded at a rate dTc/dP = -0.34 K/GPa, as expected in compounds with transition metals. The experimental results in Co, Ni and Pt based compounds are analyzed from the point of view of the external and chemical internal pressure effects.