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Superparamagnetic-like behavior and spin–orbit coupling in (Co,Zn)RE4W3O16 tungstates (RE=Nd, Sm, Eu, Gd, Dy and Ho) by P. Urbanowicz; E. Tomaszewicz; T. Groń; H. Duda; A.W. Pacyna; T. Mydlarz; H. Fuks; S.M. Kaczmarek; J. Krok-Kowalski is a Materials Science article available to read on EtoBox.

What is Superparamagnetic-like behavior and spin–orbit coupling in (Co,Zn)RE4W3O16 tungstates (RE=Nd, Sm, Eu, Gd, Dy and Ho) about?

Magnetic susceptibility measurements carried out on (Co,Zn)RE 4 W 3 O 16 compounds revealed a disordered state of magnetic moments above 4.2 K for all compounds under study, and a weak response to magnetic field and temperature for ZnSm 4 W 3 O 16 and ZnEu 4 W 3 O 16 samples. The temperature independent component of magnetic susceptibility has a negative value for ZnGd 4 W 3 O 16 and a positive one for the rest of the tungstates, indicating a domination of van Vleck contribution. The magnetization isotherms of majority of the tungstates under study revealed both spontaneous magnetic moments and hysteresis characteristic for the superparamagnetic-like behavior with blocking temperature T B $ 30 K, except for ZnEu 4 W 3 O 16 . Fitting procedure of the Lande ́factor revealed that the stronger the orbital contribution, the weaker the superparamagnetic effect, namely for ZnRE 4 W 3 O 16 . In case of CoRE 4 W 3 O 16 a significant participation of the Co 2 þ moment in the spontaneous magnetization was observed.

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Author

P. Urbanowicz; E. Tomaszewicz; T. Groń; H. Duda; A.W. Pacyna; T. Mydlarz; H. Fuks; S.M. Kaczmarek; J. Krok-Kowalski

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0022-3697)

Published

2011

Language

EN

Field

Materials Science (Physical Sciences)