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Title: Magnetism of perovskite cobaltites with Kramers rare-earth ions

The band-gap insulators RECoO{sub 3} (RE = Nd{sup 3+}, Sm{sup 3+}, and Dy{sup 3+}) with Co{sup 3+} ions stabilized in the non-magnetic low-spin state have been investigated by specific heat measurements. The experiments evidence an antiferromagnetic ordering of the rare earths with Néel temperature of T{sub N} = 1.25, 1.50, and 3.60 K for NdCoO{sub 3}, SmCoO{sub 3}, and DyCoO{sub 3}, respectively. With increasing external field, the lambda peak in specific heat, indicative of the transition, shifts to lower temperatures and vanishes for field of about 3 T. Starting from this point, a broader Schottky peak is formed, centered in 1 K range, and its position is moved to higher temperatures proportionally to applied field. The origin of the peak is in Zeeman splitting of the ground Kramers doublet, and the gradual shift with field defines effective g-factors for the rare-earth pseudospins in studied compounds. The results obtained are confronted with the calculations of crystal field splitting of the rare-earth multiplets.
Authors:
; ; ; ;  [1] ;  [2]
  1. Institute of Physics ASCR, Cukrovarnická 10, 162 00 Prague 6 (Czech Republic)
  2. Faculty of Engineering, Iwate University, Morioka 020-8551 (Japan)
Publication Date:
OSTI Identifier:
22273884
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETISM; COBALT IONS; COBALT OXIDES; CRYSTAL FIELD; DYSPROSIUM COMPOUNDS; DYSPROSIUM IONS; LANDE FACTOR; MULTIPLETS; NEEL TEMPERATURE; NEODYMIUM COMPOUNDS; SAMARIUM COMPOUNDS; SAMARIUM IONS; SPECIFIC HEAT; SPIN; TEMPERATURE DEPENDENCE; ZEEMAN EFFECT