Abstract We address the nature of the collective magnetic state in an ideal high-entropy alloy (HEA), representing a magnetically concentrated system with all lattice sites occupied by localized magnetic moments and containing randomness and frustration due to chemical disorder. Being a “metallic glass on a topologically ordered lattice”, HEAs possess simultaneously the properties of an ordered crystal and an amorphous glass. The influence of this crystal-glass duality on the collective magnetic state was studied experimentally on a hexagonal Tb-Dy-Ho-Er-Tm (TDHET) HEA, composed of rare-earth (RE) elements with zero pair mixing enthalpies that assure completely random mixing of the elements and very similar atomic radii that minimize lattice distortions, representing a prototype of an ideal HEA. The TDHET HEA is characterized by probability distributions of the atomic moments P ( μ ) , the exchange interactions P ( J ) , the magnetocrystalline anisotropy P ( D ) , and the dipolar interactions P ( H d ) . Based on the measurements of the static and dynamic magnetization, the magnetization M ( H ) curves, the thermoremanent magnetization, the specific heat and the magnetoresistance, we found that the collective magnetic state of the TDHET is temperature-dependent, forming a speromagnetic (SPM) state in the temperature range between about 140 and 30 K and an asperomagnetic (ASPM) state below 20 K. In the intermediate temperature range between 30 and 20 K, a spin glass (SG) state is formed, representing a transition state between the speromagnetic and asperomagnetic states. The observed temperature evolution of the magnetic ground state in the TDHET HEA upon cooling in the sequence SPM→SG→ASPM is a result of temperature-dependent, competing magnetic interactions. The distribution of the exchange interactions P ( J ) shifts continuously on the J axis from the high-temperature SPM-type with the average interaction biased towards a net negative value, J ‾ 0 , through the SG-type with J ‾ = 0 , to the low-temperature ASPM-type with J ‾ > 0 . This shift is a band-structure effect, closely linked with the crystallinity of the spin system, which the TDHET HEA shares with the topologically ordered crystals. The probability distributions P ( μ ) , P ( J ) , P ( D ) and P ( H d ) are, on the other hand, a consequence of chemical disorder, a property that the TDHET HEA shares with the amorphous magnets. Both features, the topologically ordered lattice and the amorphous-type chemical disorder essentially determine the magnetic state of an ideal, RE-based HEA.

中文翻译：

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作为 Tb-Dy-Ho-Er-Tm“理想”高熵合金基态的磁磁性和非磁磁性

摘要我们解决了理想高熵合金 (HEA) 中集体磁态的性质，它代表了一个磁集中系统，所有晶格位置都被局部磁矩占据，并且由于化学无序而包含随机性和挫折。作为“拓扑有序晶格上的金属玻璃”，HEAs 同时具有有序晶体和非晶玻璃的特性。在六方 Tb-Dy-Ho-Er-Tm (TDHET) HEA 上通过实验研究了这种晶体 - 玻璃二象性对集体磁态的影响，该 HEA 由具有零对混合焓的稀土 (RE) 元素组成，确保完全元素的随机混合和非常相似的原子半径，最大限度地减少了晶格畸变，代表了理想 HEA 的原型。TDHET HEA的特征在于原子矩P(μ)、交换相互作用P(J)、磁晶各向异性P(D)和偶极相互作用P(Hd)的概率分布。基于对静态和动态磁化强度、磁化强度 M ( H ) 曲线、热剩磁强度、比热和磁阻的测量，我们发现 TDHET 的集体磁态与温度有关，形成了一个超磁 (SPM) ) 状态在大约 140 和 30 K 之间的温度范围内和低于 20 K 的非磁 (ASPM) 状态。在 30 和 20 K 之间的中间温度范围内，形成自旋玻璃 (SG) 状态，代表之间的过渡状态超磁态和非磁态。观察到的 TDHET HEA 中磁基态在 SPM→SG→ASPM 顺序冷却时的温度演变是温度相关的竞争性磁相互作用的结果。交换相互作用 P ( J ) 的分布在 J 轴上从高温 SPM 型连续移动，平均相互作用偏向净负值 J ‾ 0 ，通过 J ‾ = 0 的 SG 型，到 J ‾ > 0 的低温 ASPM 型。这种转变是一种能带结构效应，与自旋系统的结晶度密切相关，TDHET HEA 与拓扑有序晶体共享。另一方面，概率分布 P ( μ ) 、 P ( J ) 、 P ( D ) 和 P ( H d ) 是化学无序的结果，这是 TDHET HEA 与非晶磁体共享的特性。两个特点，