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Title: Magnetic behavior of LaMn{sub 2}(Si{sub (1−x)}Ge{sub x}){sub 2} compounds characterized by magnetic hyperfine field measurements

The temperature dependence of the magnetic hyperfine field (B{sub hf}) at Mn atom sites was measured in LaMn{sub 2}(Si{sub (1−x)}Ge{sub x}){sub 2}, with 0 ≤ x ≤ 1, compounds with perturbed γ−γ angular correlation spectroscopy using {sup 111}In({sup 111}Cd) as probe nuclei in the temperature range from 20 K to 480 K. The results show a transition from antiferromagnetic to ferromagnetic ordering for all studied compounds when Ge gradually replaces Si and allowed an accurate determination of the Néel temperature (T{sub N}) for each compound. It was observed that T{sub N} decreases when Ge concentration increases. Conversely, the Curie temperature increases with increase of Ge concentration. This remarkable change in the behavior of the transition temperatures is discussed in terms of the Mn-Mn distance and ascribed to a change in the exchange constant J{sub ex}.
Authors:
; ; ;  [1]
  1. Instituto de Pesquisas Energéticas e Nucleares, University of São Paulo, 05508-000 São Paulo (Brazil)
Publication Date:
OSTI Identifier:
22273835
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; ANGULAR CORRELATION; ANTIFERROMAGNETISM; CADMIUM 111; CONCENTRATION RATIO; CURIE POINT; FERROMAGNETISM; GAMMA SPECTROSCOPY; GERMANIDES; HYPERFINE STRUCTURE; INDIUM 111; LANTHANUM COMPOUNDS; MAGNETIC FIELDS; MANGANESE SILICIDES; NEEL TEMPERATURE; TEMPERATURE DEPENDENCE