New structural phase transition and magnetic ordering in (C2H5NH3)2MnCl4
S. ZherlitsynPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovA. A. StepanovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. D. FilPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. P. PopovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
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The behavior of the velocities of sound and thermal expansion in the perovskite-type layered compound (C2H5NH3)2MnCl4 is studied. It is shown that the antiferromagnetic ordering (TN = 42 K) in this compound is preceded by a structural phase transition (T0 = 47 K). Singularities in the velocity of sound near the spin-flop transition are used to construct the H–T diagram for this antiferromagnet. In the temperature region T < 10 K, singularities are observed in the absorption and velocity of sound, which can be treated as a relaxation interaction of acoustic vibrations with inhomogeneous crystal states.
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