Bulk and Local Magnetic Susceptibility of ErB12

A. Bogach a, L. Bogomolov a, V. Glushkov a, S. Demishev a, D. Sluchanko a, N. Sluchanko a, N. Shitsevalova b, A. Levchenko b, V. Filipov b, K. Flachbart c and K. Siemensmeyer d a A.M. Prokhorov General Physics Institute of RAS, 38, Vavilov str., Moscow, 119991, Russia b Institute for Problems of Materials Science of UAS, 3, Krzhyzhanovsky str., 03680 Kiev, Ukraine c Center of Low Temperature Physics, IEP SAS, 04001 Košice, Slovakia d Hahn-Meitner Institute, 100, Glienicker Str., 14109 Berlin, Germany

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Received: 9 07 2007;

High precision measurements of magnetoresistance Δρ/ρ=f(T, H) and magnetization M(T, H) were carried out on single crystals of rare-earth dodecaboride ErB12 at temperatures in the interval 1.8-30 K in magnetic fields up to 70 kOe. The high accuracy of the experiments allowed us to perform numerical differentiation and analyze quantitatively the behavior of the derivative d( Δρ/ρ) /dH= f(T, H) and of the magnetic susceptibility χ(T, H) =dM /dH in paramagnetic and magnetically ordered (antiferromagnetic, TN ≈ 6.7 K and TM ≈ 5.85 K) phases of ErB12. It was shown that negative magnetoresistance anomalies observed in present study in paramagnetic state of ErB12 may be consistently interpreted in the framework of a simple relation between resistivity and magnetization - Δρ/ρ ∼ M2.

DOI: 10.12693/APhysPolA.113.271 PACS numbers: 72.15.Eb, 75.50.Ee