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VOLUME 27 (1978) | ISSUE 6 | PAGE 333
Doubling of the sound frequency and acoustic detection in hematite
The first of many possible manifestations of effective anharmonicity (of magnetoelastic origin) of the elastic subsystem of antiferromagnets-second-harmonic generation and acoustic detection of a modulated sound wave—have been observed for the first time in single-crystal hematite. In agreement with the predictions of the theory, both effects are large and depend strongly on the magnetic field.