Crystal structure and complex magnetic properties of R11Pd4In9 compounds (R = Y, Gd–Er)

S Baran,Yu Tyvanchuk,B Penc,Ya Kalychak,A Hoser,A Szytuła

doi:10.1016/j.intermet.2020.106837

S Baran, Yu Tyvanchuk + Show 4 more

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https://doi.org/10.1016/j.intermet.2020.106837

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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.

Highlights

The rare-earth—transition metal—In (R-T-In) ternary systems form a rich group of the intermetallic compounds with interesting crystal structure and unique physical properties [1]
In this work we report the results of X-ray diffraction and dc magnetic measurements of the R11Pd4In9 (R 1⁄4 Y, Gd–Er) compounds
The critical temperature of magnetic order temperatures of magnetic ordering (Tc), those for R 1⁄4 Tb and Dy, do not obey the de Gennes relation indicating an influence of the crystalline electric field

Summary

Introduction

The rare-earth—transition metal—In (R-T-In) ternary systems form a rich group of the intermetallic compounds with interesting crystal structure and unique physical properties [1]. In recent years the iso structural R11Ni4In9 compounds (Nd11Pd4In9-type structure, Pearson symbol oC48, space group Cmmm) were intensively investigated. Ac cording to magnetic measurements they exhibit complex magnetic properties at low temperatures with multiple magnetic transitions [2,3,4,5,6]. During investigation of the R-Pd-In system at 870 K an existence of the R11Pd4In9 (R 1⁄4 La, Ce, Pr, Nd, Sm, Gd, Tb, Dy) compounds [7] with the Nd11Pd4In9-type structure [8] has been established. The compounds have complex crystal structure in which the rare earth atoms occupy five nonequivalent crystallographic positions

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