Room temperature giant baroresistance and magnetoresistance and its tunability in Pd doped FeRh

TL;DR

This study demonstrates giant baroresistance and magnetoresistance at room temperature in Pd-doped FeRh, with tunable effects via pressure and magnetic field, revealing coupled magnetic and lattice phenomena.

Contribution

It reports the first observation of large, tunable room temperature baroresistance and magnetoresistance in Pd-doped FeRh, highlighting the coupled magnetic and lattice effects.

Findings

Giant baroresistance of approximately 128% at room temperature.

Magnetoresistance of approximately -55% at 5K and 8 Tesla.

Pressure and magnetic field can tune the effects over a wide temperature range.

Abstract

We report room temperature giant baro-resistance ($\approx$128\%) in $Fe_{49}(Rh_{0.93}Pd_{0.07})_{51}$. With the application of external pressure and magnetic field the temperature range of giant baro-resistance ($\approx$600\% at 5K and 19.9 kbar and 8 Tesla) and magnetoresistance ($\approx$-85\% at 5K and 8 tesla) can be tuned from 5 K to well above room temperature. As the AFM state is stabilized at room temperature under external pressure, it shows giant room temperature magnetoresistance ($\approx$-55\%) with magnetic field. Due to coupled magnetic and latticel changes, the isothermal change in room temperature resistivity with pressure (in the absence of applied magnetic field) as well as magnetic field (under various constant pressure) can be scaled together to a single curve when plotted as a function of X = T + 12.8*H - 7.2*P.