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

R. Falconi (1) , A. Duran (2) , Manuel Nunez-Regueiro (3) , R. Escudero (2)

1 Ciencias Basicas
2 Univ Nacl Autonoma Mexico
3 NEEL - MagSup - Magnétisme et Supraconductivité

High-pressure electrical resistivity ab measurements on intermetallic Pr(Co, Ni, Pt)2B2C compounds were performed down to 2K. At room pressure the ab(T ) 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 PrNi2B2C. The low temperature behavior of ab(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.

Domaines: Supraconductivité [cond-mat.supr-con]

R. Falconi, A. Duran, Manuel Nunez-Regueiro, R. Escudero. Pressure effects in PrT2B2C (T = Co, Ni, Pt): Applied and chemical pressure. physica status solidi (a), 2011, 208 (9), pp.2159-2165. ⟨10.1002/pssa.201026513⟩. ⟨hal-00966296⟩