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Structural and magnetic properties of the CoMn$_{0.88}$Cu$_{0.12}$Ge compoundhave been investigated using X-ray diffraction (XRD) and differential scanningcalorimetry (DSC) accompanied with investigation of magnetic properties underapplied hydrostatic pressure up to 12 kbar. It has been found that theorthorhombic crystal structure of the TiNiSi-type, which is dominant at lowtemperatures, turns into the hexagonal Ni$_2$In-type one, slightly above 200 K.The structural transition is of the first-order type as confirmed by presenceof distinct thermal hysteresis exceeding 20 K. The ac magnetic measurementsindicate a ferromagnetic order below the Curie temperature $T_C$ of 238 K,followed by additional anomaly at lower temperatures - the latter one beingrelated to the structural transition. Application of hydrostatic pressure leadsto temperature separation of the purely magnetic transition, whose Curietemperature $T_C$ slowly increases with applied pressure, and themagnetostructural transition characterized by critical temperature showing muchrapid decrease with increasing pressure. Comparison of the DSC data for theinvestigated compound and the isostructural CoMn$_{0.95}$Cu$_{0.05}$Ge one hasmade it possible to determine both the structural and magnetic components ofentropy change.

Tuning magnetostructural phase transition in CoMn$_{0.88}$Cu$_{0.12}$Ge by application of hydrostatic pressure