Person:
Martínez De Irujo Labalde, Xabier

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First Name
Xabier
Last Name
Martínez De Irujo Labalde
URI
https://hdl.handle.net/20.500.14352/86806
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Department
Química Inorgánica
Area
Química Inorgánica
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2018 - 20192
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Author: García-Martín, Susana ×

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    Influence of Structural (Cation and Anion) Order in the Superconducting Properties of Ozone-Oxidized Mo0.3Cu0.7Sr2RECu2Oy (RE = Yb, Tm, Gd, Nd, and Pr)
    (Inorganic Chemistry, 2018) Martínez De Irujo Labalde, Xabier; García-Martín, Susana; Urones-Garrote, Esteban; Alario-Franco, Miguel Ángel
    The influence of rare earth (RE) elements on superconducting properties of the transition element (TE)-substituted TExCu1−xSr2RECu2Oy cuprates has not been sufficiently emphasized so far. In the case of molibdocuprates with the general formula Mo0.3Cu0.3Sr2RECu2Oy, all the RE element containing compounds except La, Ce, and Lu can be prepared at room pressure. The influence of the crystal structure on the superconducting properties after ozone oxidation of the present system is reported selecting three groups of RE elements attending to their different atom sizes: small (Yb and Tm), medium (Gd), and big (Nd and Pr). Advanced transmission electron microscopy, various diffraction techniques, and spectroscopic analysis have been used to demonstrate that the increase of structural disorder complemented with a decrease in the hole content play a major role in the vanishing of superconductivity within the present system.
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    Multiferroism Induced by Spontaneous Structural Ordering in Antiferromagnetic Iron Perovskites
    (Chemistry of Materials, 2019) García-Martín, Susana; Martínez De Irujo Labalde, Xabier; Goto, Masato; Urones-Garrote, Esteban; Amador, Ulises; Ritter, Clemens; Amano Patino, Midori E; Koedtruad, Anucha; Tan, Zhenhong; Shimakawa, Yuichi
    Room-temperature multiferroism in polycrystalline antiferromagnetic Fe perovskites is reported for the first time. In the perovskite-type oxides RE1.2Ba1.2Ca0.6Fe3O8 (RE = Gd, Tb), the interplay of layered ordering of Gd(Tb), Ba, and Ca atoms with the ordering of FeO4-tetrahedra (T) and FeO6-octahedra (O) results in a polar crystal structure. The layered structure consists of the stacking sequence of RE/Ca-RE/Ca-Ba-RE/Ca layers in combination with the TOOT sequence in a unit cell. A polar moment of 33.0 μC/cm2 for the Gd-oxide (23.2 μC/cm2 for the Tb one) is determined from the displacements of the cations, mainly Fe, and oxygen atoms along the b-axis. These oxides present antiferromagnetic ordering doubling the c-axis, and the magnetic structure in the Tb compound remains up to 690 K, which is one of the highest transition temperatures reported in Fe perovskites.