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Synthesis of the new RGaMnO5 (R = Ho, Er, Tm) oxides: Structural and magnetic features

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Abstract

Polycrystalline HoGaMnO5, ErGaMnO5, and TmGaMnO5 oxides have been first prepared by soft chemistry procedures followed by high oxygen pressure treatments, to stabilize Mn4+ cations. Their crystal structures and magnetic behavior have been studied at room temperature and 5 K by neutron powder diffraction (NPD) data in complement with magnetization measurements. RGaMnO5 are orthorhombic, Pbam space group, and their crystal structures contain infinite chains of edge-sharing Mn4+O6 octahedra, interconnected by pyramidal Ga3+O5 and RO8 units. For R = Ho, a = 7.2810(4), b = 8.4526(4), and c = 5.6668(3) Å; for R = Er, a = 7.2575(3), b = 8.4357(3), and c = 5.6613(2) Å; and for R = Tm, a = 7.2438(3), b = 8.4124(3), and c = 5.6509(2) Å, at room temperature. Above 300 K the reciprocal magnetic susceptibility follows a Curie-Weiss law. In the paramagnetic region, a positive Weiss constant suggests the presence of ferromagnetic interactions, which have been investigated by low-temperature NPD for R = Er, Tm. The 5 K patterns show a detectable long-range magnetic ordering over the Mn and R positions, ferromagnetically aligned along the x-direction.

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Authors and Affiliations

  1. Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cientificas, Cantoblanco, E-28049, Spain

    Cristina de la Calle, José A. Alonso, María J. Martínez-Lope & Mar García-Hernández

  2. Institute Laue-Langevin 156X, F-38042, Grenoble Cedex 9, France

    María Teresa Fernández-Díaz

Authors
  1. Cristina de la Calle
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  2. José A. Alonso
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  3. María J. Martínez-Lope
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  4. Mar García-Hernández
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  5. María Teresa Fernández-Díaz
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Correspondence to José A. Alonso.

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de la Calle, C., Alonso, J.A., Martínez-Lope, M.J. et al. Synthesis of the new RGaMnO5 (R = Ho, Er, Tm) oxides: Structural and magnetic features. Journal of Materials Research 24, 2837–2844 (2009). https://doi.org/10.1557/jmr.2009.0361

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  • DOI: https://doi.org/10.1557/jmr.2009.0361

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