Giant-diamagnetic and magnetization-step effects in HgMnTe monocrystal

TL;DR

This paper reports the observation of giant diamagnetism and magnetization steps in HgMnTe monocrystals within the spin glass regime, supported by Monte Carlo simulations, suggesting possible long-range magnetic order in a spin glass state.

Contribution

It introduces the discovery of GDM and magnetization steps in HgMnTe, linking them to long-range AF interactions and non-uniform Mn distribution, supported by theoretical modeling.

Findings

GDM susceptibility is 100-1000 times that of classic diamagnetism

GDM and magnetization steps observed below critical temperature and field

Monte Carlo simulations confirm the formation of quasi-static spin waves

Abstract

In Hg$_{1-x}$Mn$_x$Te (x$\geq$0.16) monocrystal, the giant-diamagnetic (GDM) and magnetization-step phenomena have been observed in spin glass (SG) regime. The susceptibility of GDM is about 100-1000 times than that of classic diamagnetic. It can be interpreted that: due to the long-range antiferromagnetic (AF) exchange interactions and the non-uniform random distribution of Mn$^{2+}$ ions in Hg$_{1-x}$Mn$_x$Te, a quasi-static spin wave forms and produces the GDM phenomenon below the critical temperature and magnetic field. Meanwhile, this theory is proved by Monte Carlo simulations in a two-dimensional AF cluster based on XY model. Hence, it is possible to emerge long-range magnetic order structure in SG state.