Magnetic Response of Conduction Electrons in Nonmagnetic YB6, LaB6, and YbB6 Hexaborides with Electronic and Structural Instabilities

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Abstract

A detailed investigation of contributions to the magnetization of nonmagnetic YB6, LaB6, and YbB6 hexaboride single crystals has been performed, and a procedure for their separation has been proposed. It has been shown that a low value of electronic susceptibility χe(T) in YB6 and LaB6 hexaborides seems to be associated with a small effective mass of band carriers, m* ~ 0.5m0. As a result of this, the Pauli component and Landau diamagnetism cancel each other. It has been found that χe(T) varies in the intervals T < T* (T* ~ 50  K) and T > 150 K, which are attributed to an order–disorder transition below T* and a carriers-related contribution due to the Jahn–Teller structural instability of the boron frame work.

About the authors

N. E. Sluchanko

Prokhorov General Physics Institute, Russian Academy of Sciences

Email: nes@lt.gpi.ru
Moscow, 119991 Russia

A. V. Kuznetsov

National Research Nuclear University (MEPhI)

Email: mes@lt.gpi.ru
Moscow, 115409 Russia

A. N. Azarevich

Prokhorov General Physics Institute, Russian Academy of Sciences

Email: mes@lt.gpi.ru
Moscow, 119991 Russia

A. V. Bogach

Prokhorov General Physics Institute, Russian Academy of Sciences

Email: mes@lt.gpi.ru
Moscow, 119991 Russia

N. Yu. Shitsevalova

Frantsevich Institute for Materials Science Problems, National Academy of Sciences of Ukraine

Email: mes@lt.gpi.ru
Kiev, 03142 Ukraine

S. E. Polovets

Frantsevich Institute for Materials Science Problems, National Academy of Sciences of Ukraine

Email: mes@lt.gpi.ru
Kiev, 03142 Ukraine

V. B. Filipov

Frantsevich Institute for Materials Science Problems, National Academy of Sciences of Ukraine

Email: mes@lt.gpi.ru
Kiev, 03142 Ukraine

A. Yu. Tsvetkov

Lebedev Physical Institute, Russian Academy of Sciences

Email: mes@lt.gpi.ru
Moscow, 119991 Russia

S. Yu. Gavrilkin

Lebedev Physical Institute, Russian Academy of Sciences

Author for correspondence.
Email: mes@lt.gpi.ru
Moscow, 119991 Russia

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