Magnetic transitions in Mn3O4 and an anomaly at 38 K in magnetization and specific heat

Abstract : Mn3O4 is one of the archetypal examples of tetragonally distorted spinels. In this paper we reinvestigate its complex magnetic ordering process by using high-resolution magnetic and calorimetric measurements. The first-order transition to the ground state is found to exhibit a latent heat of 4 J mol-1 and a thermal hysteresis of 0.6 K. Moreover, the peculiar field-induced broadening observed at this transition is shown to be consistent with general predictions about incommensurate-to-commensurate transition. In addition to the known sequence of transitions at TN43 K, T140 K, and T234 K, a new anomaly close to T38 K is observed in both magnetization and heat capacity data. A possible origin of this feature is discussed in terms of magnetic instability within the incommensurate spiral spin configuration.
keyword : PIEnergie
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Journal articles
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Submitted on : Wednesday, April 11, 2012 - 11:00:02 AM
Last modification on : Wednesday, October 23, 2019 - 2:04:10 PM

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François Guillou, S. Thota, Wilfrid Prellier, Jitendra Kumar, Vincent Hardy. Magnetic transitions in Mn3O4 and an anomaly at 38 K in magnetization and specific heat. Physical Review B : Condensed matter and materials physics, American Physical Society, 2011, 83, pp.094423. ⟨10.1103/PhysRevB.83.094423⟩. ⟨hal-00686761⟩

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