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

Journal Article · Wed May 07 04:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4864439· OSTI ID:22273835

Carbonari, A. W.; Cabrera-Pasca, G. A.; Saxena, R. N. ^[1]

---

1. Instituto de Pesquisas Energéticas e Nucleares, University of São Paulo, 05508-000 São Paulo (Brazil)

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}.

• OSTI ID: 22273835
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 17 Vol. 115; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

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