Juxtaposition of Spin Freezing and Long Range Order in a Series of Geometrically Frustrated Antiferromagnetic Gadolinium Garnets

TL;DR

This study investigates the magnetic behavior of a series of geometrically frustrated Gd garnets, revealing both spin freezing and long-range order phenomena through specific heat measurements and structural analysis.

Contribution

It provides new insights into the coexistence of spin freezing and long-range magnetic order in similar Gd garnet systems, highlighting the effects of disorder and structural differences.

Findings

Gd3Ga5O12 shows no magnetic ordering features.

Gd3Te2Li3O12 and Gd3Al5O12 exhibit ordering transitions at 243 mK and 175 mK.

Low level disorder influences magnetic behavior.

Abstract

Specific heat measurements in zero magnetic field are presented on a homologous series of geometrically frustrated, antiferromagnetic, Heisenberg garnet systems. Measurements of Gd3Ga5O12, grown with isotopically pure Gd, agree well with previous results on samples with naturally abundant Gd, showing no ordering features. In contrast, samples of Gd3Te2Li3O12 and Gd3Al5O12 are found to exhibit clear ordering transitions at 243 mK and 175 mK respectively. The effects of low level disorder are studied through dilution of Gd3+ with non-magnetic Y3+ in Gd3Te2Li3O12. A thorough structural characterization, using X-ray diffraction, is performed on all of the samples studied. We discuss possible explanations for such diverse behavior in very similar systems.