Large magnetoresistance and magnetocaloric effect above 70 K in Gd2Co2Al, Gd2Co2Ga and Gd7Rh3

TL;DR

This study investigates Gd-based compounds Gd2Co2Al, Gd2Co2Ga, and Gd7Rh3, revealing significant magnetoresistance and magnetocaloric effects above 70 K, linked to their magnetic ordering temperatures.

Contribution

It reports the observation of large magnetoresistance and magnetocaloric effects in Gd compounds above 70 K, highlighting their potential for magnetic applications.

Findings

Large negative magnetoresistance observed near magnetic transition temperatures.

Significant magnetocaloric effect correlates with magnetoresistance behavior.

Magnetic ordering temperatures are around 76-78 K and 140 K.

Abstract

The electrical resistivity, magnetization and heat-capacity behavior of the Gd-based compounds, Gd2Co2Al, Gd2Co2Ga and Gd7Rh3, ordering magnetically at TC= 78 K, TC= 76 K and TN= 140 K have been investigated as a function of temperature and magnetic field. All these compounds are found to show large magnetoresistance (with a negative sign) in the paramagnetic state at rather high temperatures with the magnitude peaking at respective magnetic ordering temperatures. There is a corresponding behavior in the magnetocaloric effect as inferred from the entropy derived from these data.