Bullard T J, Susner M A, Taddei K M, Brant J A, Haugan T J
UES, Inc., 4401 Dayton-Xenia Rd., Dayton, OH, 45432, USA.
Aerospace Systems Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Dayton, OH, 45433, USA.
Sci Rep. 2021 May 31;11(1):11355. doi: 10.1038/s41598-021-89197-1.
CuAlO is a ternary oxide spinel with Cu ions ([Formula: see text]) primarily populating the A-site diamond sublattice. The compound is reported to display evidence of spin glass behavior but possess a non-frozen magnetic ground state below the transition temperature. On the other hand, the spinel CuGaO displays spin glass behavior at ~ 2.5 K with Cu ions more readily tending to the B-site pyrochlore sublattice. Therefore, we investigate the magnetic and structural properties of the solid solution CuAlGaO examining the evolution of the magnetic behavior as Al is replaced with a much larger Ga ion. Our results show that the Cu ions tend to migrate from tetrahedral to octahedral sites as the Ga ion concentration increases, resulting in a concomitant change in the glassy magnetic properties of the solution. Results indicate glassy behavior for much of the solution with a general trend towards decreasing magnetic frustration as the Cu ion shifts to the B-site. However, the [Formula: see text] and 0.2 members of the system do not show glassy behavior down to our measurement limit (1.9 K) suggesting a delayed spin glass transition. We suggest that these two members are additional candidates for investigation to access highly frustrated exotic quantum states.
CuAlO是一种三元氧化物尖晶石，其中铜离子（[化学式：见原文]）主要占据A位金刚石亚晶格。据报道，该化合物表现出自旋玻璃行为的证据，但在转变温度以下具有非冻结的磁性基态。另一方面，尖晶石CuGaO在约2.5 K时表现出自旋玻璃行为，铜离子更容易趋向于B位烧绿石亚晶格。因此，我们研究了固溶体CuAlGaO的磁性和结构性质，考察了用大得多的Ga离子取代Al时磁行为的演变。我们的结果表明，随着Ga离子浓度的增加，铜离子倾向于从四面体位置迁移到八面体位置，导致溶液的玻璃态磁性性质随之发生变化。结果表明，大部分溶液表现出玻璃态行为，随着铜离子转移到B位，磁阻挫总体上呈下降趋势。然而，该体系的[化学式：见原文]和0.2成员在我们的测量极限（1.9 K）以下未表现出玻璃态行为，这表明自旋玻璃转变延迟。我们认为，这两个成员是用于研究以获得高度阻挫的奇异量子态的额外候选对象。
