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Pb2MnTeO6 Double Perovskite: An Antipolar Anti-ferromagnet.
Retuerto, Maria; Skiadopoulou, Stella; Li, Man-Rong; Abakumov, Artem M; Croft, Mark; Ignatov, Alexander; Sarkar, Tapati; Abbett, Brian M; Pokorný, Jan; Savinov, Maxim; Nuzhnyy, Dmitry; Prokleska, Jan; Abeykoon, Milinda; Stephens, Peter W; Hodges, Jason P; Vanek, Premysl; Fennie, Craig J; Rabe, Karin M; Kamba, Stanislav; Greenblatt, Martha.
Afiliación
  • Retuerto M; Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , 610 Taylor Road, Piscataway, New Jersey 08854, United States.
  • Skiadopoulou S; Institute of Physics, The Czech Academy of Sciences , Na Slovance 2, 18221 Prague 8, Czech Republic.
  • Li MR; Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , 610 Taylor Road, Piscataway, New Jersey 08854, United States.
  • Abakumov AM; EMAT, University of Antwerp , Groenenborgerlaan 171, Antwerp B-2020, Belgium.
  • Croft M; Chemistry Department, Moscow State University , 119991 Moscow, Russia.
  • Ignatov A; Department of Physics and Astronomy, Rutgers, The State University of New Jersey , 136 Frelinghuysen Road, Piscataway, New Jersey 08854, United States.
  • Sarkar T; Department of Physics and Astronomy, Rutgers, The State University of New Jersey , 136 Frelinghuysen Road, Piscataway, New Jersey 08854, United States.
  • Abbett BM; Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , 610 Taylor Road, Piscataway, New Jersey 08854, United States.
  • Pokorný J; Department of Applied and Engineering Physics, Cornell University , Ithaca, New York 14853, United States.
  • Savinov M; Institute of Physics, The Czech Academy of Sciences , Na Slovance 2, 18221 Prague 8, Czech Republic.
  • Nuzhnyy D; Institute of Physics, The Czech Academy of Sciences , Na Slovance 2, 18221 Prague 8, Czech Republic.
  • Prokleska J; Institute of Physics, The Czech Academy of Sciences , Na Slovance 2, 18221 Prague 8, Czech Republic.
  • Abeykoon M; Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University , Ke Karlovu 5, 12116 Prague 2, Czech Republic.
  • Stephens PW; Photon Sciences Directorate, Brookhaven National Laboratory , Upton, New York, United States.
  • Hodges JP; Department of Physics and Astronomy, State University of New York , Stony Brook, New York 11794 United States.
  • Vanek P; Spallation Neutron Source, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States.
  • Fennie CJ; Institute of Physics, The Czech Academy of Sciences , Na Slovance 2, 18221 Prague 8, Czech Republic.
  • Rabe KM; Department of Applied and Engineering Physics, Cornell University , Ithaca, New York 14853, United States.
  • Kamba S; Department of Physics and Astronomy, Rutgers, The State University of New Jersey , 136 Frelinghuysen Road, Piscataway, New Jersey 08854, United States.
  • Greenblatt M; Institute of Physics, The Czech Academy of Sciences , Na Slovance 2, 18221 Prague 8, Czech Republic.
Inorg Chem ; 55(9): 4320-9, 2016 05 02.
Article en En | MEDLINE | ID: mdl-27058393
ABSTRACT
Pb2MnTeO6, a new double perovskite, was synthesized. Its crystal structure was determined by synchrotron X-ray and powder neutron diffraction. Pb2MnTeO6 is monoclinic (I2/m) at room temperature with a regular arrangement of all the cations in their polyhedra. However, when the temperature is lowered to ∼120 K it undergoes a phase transition from I2/m to C2/c structure. This transition is accompanied by a displacement of the Pb atoms from the center of their polyhedra due to the 6s(2) lone-pair electrons, together with a surprising off-centering of Mn(2+) (d(5)) magnetic cations. This strong first-order phase transition is also evidenced by specific heat, dielectric, Raman, and infrared spectroscopy measurements. The magnetic characterizations indicate an anti-ferromagnetic (AFM) order below TN ≈ 20 K; analysis of powder neutron diffraction data confirms the magnetic structure with propagation vector k = (0 1 0) and collinear AFM spins. The observed jump in dielectric permittivity near ∼150 K implies possible anti-ferroelectric behavior; however, the absence of switching suggests that Pb2MnTeO6 can only be antipolar. First-principle calculations confirmed that the crystal and magnetic structures determined are locally stable and that anti-ferroelectric switching is unlikely to be observed in Pb2MnTeO6.

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Inorg Chem Año: 2016 Tipo del documento: Article País de afiliación: Estados Unidos

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Inorg Chem Año: 2016 Tipo del documento: Article País de afiliación: Estados Unidos
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