Transport and Magnetic properties of PrCoIn_5

TL;DR

This study investigates the structural, electrical, and magnetic properties of PrCoIn_5 single crystals, revealing Fermi liquid behavior, magnetic characteristics dominated by Pr^{3+} ions, and the absence of superconductivity down to 1K, influenced by chemical pressure and magnetic pair breaking.

Contribution

First detailed characterization of PrCoIn_5's properties, highlighting its magnetic behavior and factors suppressing superconductivity compared to related compounds.

Findings

PrCoIn_5 has a tetragonal structure with lower cell volume than CeCoIn_5.

Resistivity saturates above 10K, indicating Fermi liquid behavior.

No superconductivity observed down to 1K, likely due to chemical pressure and magnetic pair breaking.

Abstract

Structural, electrical and magnetic measurements of 115 single crystals of PrIn$_5$ are reported. It has a tetragonal structure and has slightly lower cell volume than its isomorphic counter part CeCoIn_5. The resistivity saturates for T\geq 10K. Analysis of the resistivity for 10K<T< 60K indicates a regular fermi liquid behavior. It does not exhibit superconductivity down to T\sim 1K. The magnetic susceptibility analysis yielded the moment to be 4.00\mu_B indicating that the magnetism of PrCoIn_5 is dominated by Pr^{3+} free ions with some admixture of the magnetic moment of the Co sublattice. The paramagnetic Curie temperature \theta \sim-40K. At low temperatures the susceptibility follows a broad maximum around T_N \sim 14.5K, and increases as the temperature is lowered. The disappearance of superconductivity for T>1K is attributed to chemical pressure effects and magnetic pair breaking.