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  Magnetic and electronic properties of the ferroelectric-photovoltaic ordered double perovskite CaMnTi2O6 investigated by x-ray absorption spectroscopies

Herrero-Martín, J., Ruiz-Fuertes, J., Bernert, T., Koch-Müller, M., Haussühl, E., & García-Muñoz, J. L. (2018). Magnetic and electronic properties of the ferroelectric-photovoltaic ordered double perovskite CaMnTi2O6 investigated by x-ray absorption spectroscopies. Physical Review B, 97(23): 235129. doi:10.1103/PhysRevB.97.235129.

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Herrero-Martín, Javier1, Author
Ruiz-Fuertes, Javier2, 3, Author
Bernert, Thomas4, Author              
Koch-Müller, Monika5, Author
Haussühl, Eiken6, Author
García-Muñoz, José Luis7, Author
Affiliations:
1ALBA Synchrotron Light Facility, 08290 Cerdanyola del Vallès, Barcelona, Spain, ou_persistent22              
2DCITIMAC, MALTA Consolider Team, Universidad de Cantabria, 39005 Santander, Spain, ou_persistent22              
3Departament de Física Aplicada-ICMUV, MALTA Consolider Team, 46100 Burjassot, Spain, ou_persistent22              
4Research Group Weidenthaler, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1950291              
5GFZ Potsdam, Sektion 4.3, Telegrafenberg, 14473 Potsdam, Germany, ou_persistent22              
6Institut für Geowissenschaften, Goethe-Universität, Altenhöferallee 1, 60438 Frankfurt am Main, Germany, ou_persistent22              
7Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus Universitari de Bellaterra, 08193 Bellaterra, Spain, ou_persistent22              

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 Abstract: The ferroelectric and magnetic phases of the double perovskite CaMnTi2O6 with A-site order have been investigated by soft x-ray absorption and magnetic circular dichroism. All spectra point to a very ionic state of divalent Mn and tetravalent Ti atoms. The effects of the crystal field produced by O ligands around tetravalent titanium and the dissimilar Mn1 and Mn2 sites were investigated. Both the so-called square-planar and the octahedrally coordinated Mn sites spectroscopically contribute in a rather similar way, with little influence by the oxygen environment. Multiplet calculations suggest a small O 2p-Ti 3d charge-transfer component in the FE phase. Magnetic symmetry calculations were performed to determine probable configurations of Mn spins compatible with the acentric P42mc structure and, in combination with the computational magnetic results in Inorg. Chem. 56, 11854 (2017), we have identified the P4'2m'c as the most likely magnetic space group keeping invariant the unit cell below TN. This symmetry forces the sign of the magnetic coupling along the Mn columns parallel to c to reverse with respect to the coupling between neighboring columns. Below TN, the dichroic magnetization loops at the Mn L3 edge confirm the absence of spontaneous ferromagnetism, although a very small field-induced spin polarization was detected in the sample.

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Language(s): eng - English
 Dates: 2018-03-052018-06-15
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevB.97.235129
 Degree: -

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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 97 (23) Sequence Number: 235129 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008