Structural Disorder, Specific Heat, and Magnetic Transitions in Cu2FeBO5

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Resumo

Cu2FeBO5 ludwigite single crystals have been grown from a solution–melt by spontaneous crystallization. Using the X-ray diffraction method, the crystal structure has been resolved in detail. Cations in sites M2, M3, and M4 have turned out to be structurally disordered. It has been found that oxygen atoms are disordered in one of five nonequivalent sites (O4). As can be seen from Mössbauer spectroscopy data, Fe3+ ions occupy four nonequivalent sites with different distortions of coordination octahedra. In the temperature range 40 K ≤ T ≤ 300 K, the spectra represent a superposition of quadrupole doublets. Static susceptibility measurements have revealed two magnetic features at T1 = 35 K and T2 = 20 K and spin-glass effects. Specific heat measurements in the interval 4–300 K have not discovered magnetic-transition-related anomalies.

Sobre autores

Yu. Gokhfel'd

Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Science Center (KSC), Siberian Branch, Russian Academy of Sciences

Email: yugo@iph.krasn.ru
660036, Krasnoyarsk, Russia

N. Kazak

Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Science Center (KSC), Siberian Branch, Russian Academy of Sciences

Email: nat@iph.krasn.ru
660036, Krasnoyarsk, Russia

N. Bel'skaya

Ioffe Institute

Email: yugo@iph.krasn.ru
194021, St. Petersburg, Russia

M. Molokeev

Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Science Center (KSC), Siberian Branch, Russian Academy of Sciences; Siberian Federal University

Email: yugo@iph.krasn.ru
660036, Krasnoyarsk, Russia; 660041, Krasnoyarsk, Russia

I. Gudim

Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Science Center (KSC), Siberian Branch, Russian Academy of Sciences

Email: yugo@iph.krasn.ru
660036, Krasnoyarsk, Russia

O. Kondrat'ev

National Research Center Kurchatov Institute

Email: yugo@iph.krasn.ru
123182, Moscow, Russia

E. Eremin

Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Science Center (KSC), Siberian Branch, Russian Academy of Sciences; Siberian Federal University

Email: yugo@iph.krasn.ru
660036, Krasnoyarsk, Russia; 660041, Krasnoyarsk, Russia

Yu. Knyazev

Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Science Center (KSC), Siberian Branch, Russian Academy of Sciences

Email: yugo@iph.krasn.ru
660036, Krasnoyarsk, Russia

D. Velikanov

Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Science Center (KSC), Siberian Branch, Russian Academy of Sciences

Autor responsável pela correspondência
Email: yugo@iph.krasn.ru
660036, Krasnoyarsk, Russia

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