Magnetic behavior of the nanophase of YbNi2 alloys


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Abstract

Variations in magnetic properties of the heavy-fermion YbNi2 alloy when milled in a high energy ball milling system have been investigated. The ferromagnetic transition (TC = 10.4 K) in the initial sample almost vanishes after milling, which leads to the appearance of a magnetic transition at T* = 3.2 K in nanocrystallites. Before milling, processes of spin–lattice relaxation of the Orbach–Aminov type with the participation of the first excited Stark sublevel of the Yb3+ ion located at 75 K are dominating in the electron spin dynamics in the paramagnetic phase of the alloy. A comparative study of the temperature dependence of the magnetic properties and spectra of electron paramagnetic resonance in poly- and nanocrystalline samples indicates the existence of a magnetic inhomogeneity of the compound arising upon milling.

About the authors

V. A. Ivanshin

Institute of Physics

Author for correspondence.
Email: Vladimir.Ivanshin@kpfu.ru
Russian Federation, ul. Kremlevskaya 18, Kazan, 420008

E. M. Gataullin

Institute of Physics

Email: Vladimir.Ivanshin@kpfu.ru
Russian Federation, ul. Kremlevskaya 18, Kazan, 420008

A. A. Sukhanov

Zavoiskii Kazan Physicotechnical Institute

Email: Vladimir.Ivanshin@kpfu.ru
Russian Federation, Sibirskii tract 10/7, Kazan, 420029

N. A. Ivanshin

Kazan State University of Architecture and Engineering

Email: Vladimir.Ivanshin@kpfu.ru
Russian Federation, ul.Zelenaya 1, Kazan, 420043

D. P. Rojas

Departamento de Estructuras y Física de Edificación-ETSAM

Email: Vladimir.Ivanshin@kpfu.ru
Spain, Av. Juan Herrera, 4, Madrid, 28040

L. Fernández Barquín

DCITIMAC, Facultad de Ciencias

Email: Vladimir.Ivanshin@kpfu.ru
Spain, Av. de los Castros s/n, Santander, 39005

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