Jendrzejewska Izabela, Groń Tadeusz, Kwapuliński Piotr, Kusz Joachim, Pietrasik Ewa, Goryczka Tomasz, Sawicki Bogdan, Ślebarski Andrzej, Fijałkowski Marcin, Jampilek Josef, Duda Henryk
Institute of Chemistry, University of Silesia in Katowice, 40-007 Katowice, Poland.
Institute of Physics, University of Silesia in Katowice, 40-007 Katowice, Poland.
Materials (Basel). 2021 May 22;14(11):2749. doi: 10.3390/ma14112749.
The new series of single-crystalline chromium selenides, Ta-doped ZnCrSe, 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 ZnCrTaSe ( = 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 ZnCrTaSe unit cell volume. Doping with tantalum did not significantly change the semiconductor and magnetic properties of ZnCrSe. For all studied samples (0 ≤ ≤ 0.12), an antiferromagnetic order (AFM) below ~22 K was observed. However, a small amount of Ta significantly reduced the second critical field () from 65 kOe for = 0.0 (ZnCrSe matrix) up to 42.2 kOe for = 0.12, above which the spin helical system changed to ferromagnetic (FM). The reduction can lead to strong competition among AFM and FM interactions and spin frustration, as the specific heat under magnetic fields < shows a strong field decrease in .
通过化学气相传输法合成了新的一系列单晶硒化铬Ta掺杂的ZnCrSe，以确定掺杂剂对母体化合物结构和热力学性质的影响。我们对结构、电输运、磁性和比热性质进行了全面研究。预计用更显著的Ta部分取代Cr离子会导致Cr磁矩之间直接磁相互作用的变化，并导致ZnCrTaSe（ = 0.05、0.06、0.07、0.08、0.1、0.12）体系的磁基态和电输运性质发生变化。我们发现立方体系的所有元素都具有立方尖晶石结构；然而，掺杂增益线性增加了ZnCrTaSe的晶胞体积。用钽掺杂并没有显著改变ZnCrSe的半导体和磁性。对于所有研究的样品（0≤ ≤0.12），在约22 K以下观察到反铁磁序（AFM）。然而，少量的Ta显著降低了第二临界场（），从 = 0.0（ZnCrSe基体）时的65 kOe降至 = 0.12时的42.2 kOe，高于该值时自旋螺旋体系转变为铁磁（FM）。的降低会导致AFM和FM相互作用以及自旋受挫之间的强烈竞争，因为磁场 < 下的比热显示出中的强烈场强降低。
