Abstract
Recent investigation on weak ferromagnets Fe2-xMnxCrAl (0 ≤ x < 1) reveal the existence of a cluster glass phase (CGP) and a Griffiths-like phase (GP) below and above the ferromagnetic transition temperature (TC), respectively [(2019) Sci. Rep.9 15888]. In this work, the influence of these inhomogeneous phases on the critical behaviour (around TC) of the above-mentioned series of alloys has been investigated in detail. For the parent alloy Fe2CrAl, the critical exponent γ is estimated as ~ 1.34, which lies near to the ordered 3D Heisenberg class, whereas the obtained value of the critical exponent β ~ 0.273 does not belong to any universality class. With increment in Mn concentration, both exponents γ and β increase, where γ and β approach the disordered and ordered 3D Heisenberg class, respectively. The observed deviation of γ and unconventional value of δ can be ascribed to the increment of GP with Mn-concentration. The trend noted for β can be attributed to the increment in CGP regime with an increase in Mn-content. The estimated critical exponents are consistent and reliable as corroborated using the scaling law and equations of state. Our studies indicate that the critical phenomenon of Fe2-xMnxCrAl (0 ≤ x < 1) alloys possibly belong to a separate class, which is not described within the framework of any existing universal model.
Highlights
Recent investigation on weak ferromagnets Fe2-xMnxCrAl (0 ≤ x < 1) reveal the existence of a cluster glass phase (CGP) and a Griffiths-like phase (GP) below and above the ferromagnetic transition temperature (TC), respectively [(2019) Sci
The effect of GP on critical exponents is still poorly understood in the Heusler alloys
In order to analyse the critical phenomenon near TC, where a magnetic material undergoes a second order phase transition (SOPT) from PM state to FM state, various critical exponents are determined
Summary
Recent investigation on weak ferromagnets Fe2-xMnxCrAl (0 ≤ x < 1) reveal the existence of a cluster glass phase (CGP) and a Griffiths-like phase (GP) below and above the ferromagnetic transition temperature (TC), respectively [(2019) Sci. In F e2Cr1-xMoxAl series of alloys, with Mo substitution, a significant decrement in value of the ferromagnetic transition temperature (TC) is noted[7] In this context, analysis of critical exponent is useful to understand the role of a substitution, structural disorder, or stoichiometric variations in alteration of the FM interactions. Analysis of critical exponent is useful to understand the role of a substitution, structural disorder, or stoichiometric variations in alteration of the FM interactions This process has been followed to investigate the phase transition (second order) in the Heusler alloys[7,8,9,10,11,12,13,14,15,16,17]. To study the aforementioned questions, in this manuscript we have investigated the critical behaviour of F e2-xMnxCrAl (0 ≤ x < 1) Heusler alloys in the vicinity of TC
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
