Abstract Magnetic properties of the R11Pd4In9 compounds (R = Y, Gd–Er) were investigated by means of X-ray diffraction and magnetic measurements. Three of these compounds, namely those with R = Y, Ho and Er, are newly synthesized. The compounds crystallize in the orthorhombic Nd11Pd4In9-type crystal structure (oC48, Cmmm) in which the rare earth atoms occupy five nonequivalent sublattices. Magnetic properties of the investigated compounds are related mainly to the R3+ ions, except the case of Y11Pd4In9 which is a Pauli paramagnet. For R = Gd-Er, the values of effective magnetic moments in the paramagnetic state are close to the free R3+ ion values while the moments in the ordered state at T = 2 K and H = 90 kOe are lower than the respective R3+ moments. The compounds have complex magnetic properties. All paramagnetic Curie temperatures are positive suggesting that the ferromagnetic interactions are predominant. However, the low temperature data indicate an antiferromagnetic order. With increase of temperature the magnetic properties change from antiferro-to ferrimagnetic and finally to paramagnetic ones. The critical temperatures of magnetic ordering do not fulfill the de Gennes scaling, indicating a crystalline electric field contribution to stabilization of the magnetic order at low temperatures. The neutron diffraction measurements, performed for Ho11Pd4In9, reveal a coexistence of two magnetic phases at low temperatures: the antiferromagnetic with propagation vector k = [0,0,½] and the ferrimagnetic one with k = [0,0,0]. The antiferromagnetic order is predominant at low temperatures while the ferrimagnetic one dominates at intermediate temperatures.

中文翻译：

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R11Pd4In9 化合物的晶体结构和复杂的磁性能 (R = Y, Gd–Er)

摘要 通过 X 射线衍射和磁测量研究了 R11Pd4In9 化合物 (R = Y, Gd–Er) 的磁性。这些化合物中的三种，即 R = Y、Ho 和 Er 的化合物是新合成的。这些化合物以正交 Nd11Pd4In9 型晶体结构 (oC48, Cmmm) 结晶，其中稀土原子占据五个不等价的亚晶格。所研究化合物的磁性主要与 R3+ 离子有关，但 Y11Pd4In9 除外，它是泡利顺磁体。对于 R = Gd-Er，顺磁态的有效磁矩值接近自由 R3+ 离子值，而有序态的磁矩在 T = 2 K 和 H = 90 kOe 时低于相应的 R3+ 磁矩。这些化合物具有复杂的磁性。所有顺磁居里温度都是正值，表明铁磁相互作用占主导地位。然而，低温数据表明反铁磁有序。随着温度的升高，磁性从反铁磁性变为亚铁磁性，最后变为顺磁性。磁有序的临界温度不满足 de Gennes 标度，表明晶体电场有助于在低温下稳定磁有序。对 Ho11Pd4In9 进行的中子衍射测量揭示了低温下两种磁相的共存：传播矢量 k = [0,0,½] 的反铁磁相和 k = [0,0,0] 的亚铁磁相。