Spin-glass-like behaviour in IrSr{sub 2}RECu{sub 2}O{sub 8} (RE=Sm and Eu)

Journal Article · Mon Dec 15 00:00:00 EST 2008 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2008.09.005· OSTI ID:21212139

Santos-Garcia, A.J. dos , ^[1]; Duijn, J van; Alario-Franco, M A ^[1]

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1. Laboratorio Complutense de Altas Presiones, Departamento de Quimica Inorganica, Facultad de Quimica, Universidad Complutense de Madrid (Spain)

We report the results of magnetic and specific heat measurements on the 1212-type compounds IrSr{sub 2}RECu{sub 2}O{sub 8} with RE=Sm and Eu, prepared by high-pressure and high-temperature synthesis. The magnetic susceptibility of these compounds shows a large difference in the temperature dependence of the magnetization measured under zero-field-cooled and field-cooled conditions below 87 and 71 K, respectively, and upon further cooling below {approx}10 K substantial maxima are observed too. Further AC susceptibility measurements support a glassy behaviour in lower magnetic transitions whereas the specific heat measurements do not show the typical long-range ordering commonly displayed in ferro, ferri or antiferromagnetic transitions. Hysteresis loops suggest the presence of magnetic clusters in the otherwise paramagnetic zone, indicating that these compounds probably display a reentrant spin-glass transition. Results are presented and discussed. - Graphical abstract: IrSr{sub 2}RECu{sub 2}O{sub 8} with RE=Sm and Eu were prepared by high-pressure and high-temperature synthesis. Both samples adopt a M-1212-type perovskite structure and a microdomain texturing of the long c-axis is observed by TEM. A very interesting magnetic behaviour is observed in these materials. A 'cluster by cluster freezing' model is proposed, instead of the classical individual spin freezing one to explain the spin-glass-like behaviour that seems to coexist with weak ferromagnetism in both compounds.

• OSTI ID: 21212139
• Journal Information: Journal of Solid State Chemistry, Vol. 181, Issue 12; Other Information: DOI: 10.1016/j.jssc.2008.09.005; PII: S0022-4596(08)00482-9; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANTIFERROMAGNETISM
CUPRATES
EUROPIUM COMPOUNDS
FERROMAGNETISM
IRIDIUM COMPOUNDS
MAGNETIC SUSCEPTIBILITY
MAGNETIZATION
MICROSTRUCTURE
PARAMAGNETISM
PEROVSKITE
SAMARIUM COMPOUNDS
SPECIFIC HEAT
SPIN GLASS STATE
STRONTIUM COMPOUNDS
SYNTHESIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TRANSMISSION ELECTRON MICROSCOPY