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We present here a detailed investigation into the magnetic ordering of fullHeusler alloy Ga$_2$MnCo using dc, ac magnetization measurements, neutrondiffraction and neutron depolarization experiments. Crystal structure at roomtemperature was first confirmed to be L2$_1$ using the highly intensesynchrotron X-ray diffraction (XRD) technique. Temperature dependentmagnetization reveals that Ga$_2$MnCo enters a ferromagnetic (FM) state at $T_C= $154 K, characterized by a sharp increase in magnetization and a plateau-likeregion hereafter. As the temperature is decreased further, a sharp drop inmagnetization is observed at $T_f$ = 50 K, hinting towards an antiferromagnetic(AFM) phase change. Neutron diffraction (ND) recorded over the range oftemperature from 6 to 300 K, provides combined information regarding crystal aswell as magnetic structure. Accordingly, an increase in the intensity of the NDpattern is seen at 150 K, signaling onset of long range FM order. However,there is no sign of appearance of superlattice reflections corresponding to theAFM phase, in the patterns recorded below 50 K. An unusual discontinuity in theunit cell volume is seen around $T_f$ indicating a coupling of this secondtransition with the contraction of the lattice. Attempts to unravel thisinteresting magnetic behaviour using ac susceptibility measurements lead to theexistence of glassy magnetism below $T_f$. Systematic analysis of thesusceptibility results along with neutron depolarization measurement,identifies the low temperature phase as a reentrant cluster glass.

Reentrant cluster glass and stability of ferromagnetism in Ga2MnCo Heusler alloy