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Title: Structural disorder and elementary magnetic properties of triangular lattice ErMgGaO 4 single crystals

The single crystal growth, structure, and basic magnetic properties of ErMgGaO 4 are reported. The structure consists of triangular layers of magnetic ErO 6 octahedra separated by a double layer of randomly occupied non-magnetic (Ga,Mg)O 5 bipyramids. The Er atoms are positionally disordered. Magnetic measurements parallel and perpendicular to the c axis of a single crystal reveal dominantly antiferromagnetic interactions, with a small degree of magnetic anisotropy. A weighted average of the directional data suggests an antiferromagnetic Curie Weiss temperature of approximately -30 K. Below 10 K the temperature dependences of the inverse susceptibilities in the in-plane and perpendicular-to plane directions are parallel, indicative of an isotropic magnetic moment at low temperatures. In conclusion, no sign of magnetic ordering is observed above 1.8 K, suggesting that ErMgGaO 4 is a geometrically frustrated magnet.
Authors:
 [1] ;  [1] ;  [1]
  1. Princeton Univ., Princeton, NJ (United States)
Publication Date:
Grant/Contract Number:
FG02-08ER46544
Type:
Accepted Manuscript
Journal Name:
Solid State Communications
Additional Journal Information:
Journal Volume: 276; Journal Issue: C; Journal ID: ISSN 0038-1098
Publisher:
Elsevier
Research Org:
Princeton Univ., NJ (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; A. Geometrically frustrated oxides; C. Crystal structure and symmetry
OSTI Identifier:
1441197