Abstract
Using the modified Bridgman method, a single-crystalline sample of iron selenide Fe3Se4 was grown and its magnetization and thermal expansion behavior was studied along different crystallographic directions. In a ferrimagnetically ordered state below TN = 345 K, the magnetization curves show that the magnetic moments do not lie strictly in the plane perpendicular to the c axis. The magnetocrystalline anisotropy constants, determined from the M(H) dependences along and across to the c axis, are K1 = −3.9⋅107 erg/cm3, K2 = 5.0⋅106 erg/cm3 at 4 K. Magnetic ordering in Fe3Se4 upon cooling below TN is accompanied by anisotropic deformations of the crystal lattice: expansion along the c axis and compression across the c axis. Spontaneous volume magnetostriction is positive and reaches a giant value of about 1.2⋅10-2 at 80 K. The pressure derivative of the Néel temperature is estimated using the Ehrenfest ratio as of dTN/dp ≈ − 2.1 K/kbar. The results obtained show that the properties of Fe3Se4 are strongly influenced by magnetoelastic interactions.
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