First-order antiferro-ferromagnetic transition in Fe(49)(Rh(0.93)Pd(0.07))(51) under simultaneous application of magnetic field and external pressure.
A magnetic field-pressure-temperature (H-P-T) phase diagram for first-order antiferromagnetic (AFM) to ferromagnetic (FM) transitions in Fe(49)(Rh(0.93)Pd(0.07))(51) has been constructed using resistivity measurements under simultaneous application of magnetic field (up to 8 T) and pressure (up to 20 kbar). The temperature dependence of resistivity (ρ-T) shows that the width of the transition and the extent of hysteresis decreases with pressure and increases with magnetic field. By exploiting opposing trends of dT(N)/dP and dT(N)/dH (where T(N) is the first-order transition temperature), the relative effects of temperature, magnetic field and pressure on disorder-broadened first-order transitions has been studied. For this, a set of H and P values are chosen for which T(N)(H(1),P(1)) = T(N)(H(2),P(2)). Measurements for such combinations of H and P show that the temperature dependence of resistivity is similar, i.e. the broadening (in temperature) of transition as well as the extent of hysteresis remains independent of H and P. Isothermal magnetoresistance measurements under various constant pressures show that even though the critical field required for AFM-FM transition depends on applied pressure, the extent of hysteresis as well as transition width (in magnetic field) remains constant with varying pressure.
UGC-DAE Consortium for Scientific Research, University Campus, Indore-452001, India.
Pallavi
P
Kushwaha
Pallab
P
Bag
R
R
Rawat
P
P
Chaddah
D005296:Ferrous Compounds / Q000737:chemistry*; D007854:Lead / Q000737:chemistry*; D060526:Magnetic Fields; D059346:Magnets / Q000737:chemistry*; D008958:Models, Molecular; D044367:Phase Transition; D011312:Pressure; D012238:Rhodium / Q000737:chemistry*; D013696:Temperature
D005296:Ferrous Compounds; D007854:Lead; D012238:Rhodium