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Magnetic transitions in Mn 3 O 4 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 TN≃43 K, T1≃40 K, and T2≃34 K, a new anomaly close to T∗≃38 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.
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Submitted on : Thursday, January 27, 2022 - 11:00:08 AM
Last modification on : Tuesday, June 14, 2022 - 7:09:02 AM

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Wilfrid Prellier, W. Sheets, F. Guillou, S. Thota, J. Kumar, et al.. Magnetic transitions in Mn 3 O 4 and an anomaly at 38 K in magnetization and specific heat. Physical Review B, American Physical Society, 2011, 83 (9), pp.094423. ⟨10.1103/PhysRevB.83.094423⟩. ⟨hal-03545336⟩

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