Nonmagnetic ground state of the superconductor PrPt2B2C and magnetic pairbreaking in La0.9R0.1Pt2B2C (R=Ce, Pr, Nd)

S. K. Dhar; A. D. Chinchure; R. Nagarajan; S. M. Pattalwar; L. C. Gupta; E. Alleno; C. Godart

doi:10.1103/PhysRevB.65.132519

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Nonmagnetic ground state of the superconductor PrPt2B2C and magnetic pairbreaking in La0.9R0.1Pt2B2C (R=Ce, Pr, Nd)

S. K. Dhar, A. D. Chinchure, R. Nagarajan, S. M. Pattalwar, L. C. Gupta, E. Alleno, C. Godart

DOI 10.1103/PhysRevB.65.132519 · Physical Review B

T1

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Abstract

PrPt2B2C is an unusual superconducting member (Tc∼6 K) of quaternary borocarbide family. At high temperatures, Pr ions are found to carry magnetic moment, but so far no magnetic order is reported. We have investigated the nature of the electronic ground state of this material (nominal composition PrPt2.1B2.4C1.2) through magnetic and heat capacity studies. We confirm that PrPt2B2C exhibits bulk superconductivity below 6 K. Our studies show that (non-Kramers) Pr ions at low temperatures are in the crystal field split singlet ground state (nonmagnetic) and there is no indication of an induced magnetic moment. In the nonmagnetic analogue superconductor LaPt2B2C (Tc∼10.5 K), we have studied magnetic pairbreaking by magnetic ions Ce, Pr, and Nd. We find severe pair-breaking caused by Ce ions suggesting an enhanced Ce-4f-conduction electron hybridization.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
PrPt2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6	Pressure not reported	onset
PrPt2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.4	Pressure not reported	zero_resistance
PrPt2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6	Pressure not reported	onset
PrPt2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5	Pressure not reported	onset
LaPt2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10.5	Pressure not reported	unknown
LaPt2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10	Pressure not reported	onset
La0.9Pr0.1Pt2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.5	Pressure not reported	unknown
La0.9Nd0.1Pt2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9	Pressure not reported	unknown
YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15.5	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
PrRh4B4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.6	Pressure not reported	unknown