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The new series of single-crystalline chromium selenides, Ta-doped ZnCr 2 Se 4 , was synthesised by a chemical vapour transport method to determine the impact of a dopant on the structural and thermodynamic properties of the parent compound. We present comprehensive investigations of structural, electrical transport, magnetic, and specific heat properties. It was expected that a partial replacement of Cr ions by a more significant Ta one would lead to a change in direct magnetic interactions between Cr magnetic moments and result in a change in the magnetic ground state and electric transport properties of the ZnCr 2-x Ta x Se 4 ( x = 0.05, 0.06, 0.07, 0.08, 0.1, 0.12) system. We found that all the elements of the cubic system had a cubic spinel structure; however, the doping gain linearly increased the ZnCr 2  -x Ta x Se 4 unit cell volume. Doping with tantalum did not significantly change the semiconductor and magnetic properties of ZnCr 2 Se 4 . For all studied samples (0 ≤ x ≤ 0.12), an antiferromagnetic order (AFM) below T N  ~22 K was observed. However, a small amount of Ta significantly reduced the second critical field ( H c2  ) from 65 kOe for x = 0.0 (ZnCr 2 Se 4 matrix) up to 42.2 kOe for x = 0.12, above which the spin helical system changed to ferromagnetic (FM). The H c   2 reduction can lead to strong competition among AFM and FM interactions and spin frustration, as the specific heat under magnetic fields H &lt; H c   2 shows a strong field decrease in T N  .

Study of the Structure, Magnetic, Thermal and Electrical Characterisation of ZnCr2Se4: Ta Single Crystals Obtained by Chemical Vapour Transport