Restoration of Magnetic Order in Heavy Metal Doped Spin Glass

A systematic evolution of 4d-element triggered restoration of long-range magnetic order in a spin glass compound Mn
0.7
Fe
0.3
NiGe,
$\mathbf{M n}_{0.7} \mathbf{Fe}_{0.3-x} \mathbf{Rh}_{x}\mathbf{NiG}$
, will be reported in detail with the help of x-ray diffraction, bulk magnetization and ac-susceptibility measurements. The variation of lattice parameters, Mn-Mn bond lengths in the
$\boldsymbol{ab}$
-plane and along
$\boldsymbol{c}$
-direction with
$x$
will be determined by analysing the room temperature x-ray diffraction patterns, complying with Ni
2
In-type hexagonal structure. In order to uncover the type of spin-glass behaviour, the frequency-dependent ac-susceptibility cusp and relative shift in the freezing temperature will be analysed. Sherrington-Kirkpatrick criterion will be employed to understand the magnetic correlations with increasing Rh concentration. Origin of ferromagnetism in
$\boldsymbol{x}=\mathbf{0}.\mathbf{3}$
, possible exhibition of exchange bias (field cooled or zero-field cooled) in spin glass compounds of the series will be examined. Additionally, the effect of hydrostatic pressure on the spin-glass compounds will be investigated with an intent to restore the ferromagnetism by affecting the Mn-Mn distance.