TY - JOUR
T1 - Epitaxially stabilized EuMoO 3
T2 - A new itinerant ferromagnet
AU - Kozuka, Yusuke
AU - Seki, Hidenobu
AU - Fujita, Takahiro C.
AU - Chakraverty, Suvankar
AU - Yoshimatsu, Kohei
AU - Kumigashira, Hiroshi
AU - Oshima, Masaharu
AU - Bahramy, Mohammad S.
AU - Arita, Ryotaro
AU - Kawasaki, Masashi
PY - 2012/10/9
Y1 - 2012/10/9
N2 - Synthesizing metastable phases often open new functions in materials, but it is a challenging topic. Thin film techniques have advantages to form materials which do not exist in nature since nonequilibrium processes are frequently utilized. In this study, we successfully synthesize an epitaxially stabilized new compound of perovskite Eu 2+Mo 4+O 3 as a thin film form by a pulsed laser deposition. The analogous perovskite SrMoO 3 is a highly conducting paramagnetic material, but Eu 2+ and Mo 4+ are not compatible in equilibrium, and a previous study found that the more stable pyrochlore Eu 2 3+Mo 2 4+O 7 prefers to form. By using isostructural perovskite substrates, the gain of the interface energy between the film and the substrate stabilizes the matastable EuMoO 3 phase. This compound exhibits high conductivity and large magnetic moment, originating from Mo 4d 2 electrons and Eu 4f 7 electrons, respectively. Our result indicates the epitaxial stabilization is effective not only to stabilize crystallographic structures but also to form a new compound which contains unstable combinations of ionic valences in bulk form.
AB - Synthesizing metastable phases often open new functions in materials, but it is a challenging topic. Thin film techniques have advantages to form materials which do not exist in nature since nonequilibrium processes are frequently utilized. In this study, we successfully synthesize an epitaxially stabilized new compound of perovskite Eu 2+Mo 4+O 3 as a thin film form by a pulsed laser deposition. The analogous perovskite SrMoO 3 is a highly conducting paramagnetic material, but Eu 2+ and Mo 4+ are not compatible in equilibrium, and a previous study found that the more stable pyrochlore Eu 2 3+Mo 2 4+O 7 prefers to form. By using isostructural perovskite substrates, the gain of the interface energy between the film and the substrate stabilizes the matastable EuMoO 3 phase. This compound exhibits high conductivity and large magnetic moment, originating from Mo 4d 2 electrons and Eu 4f 7 electrons, respectively. Our result indicates the epitaxial stabilization is effective not only to stabilize crystallographic structures but also to form a new compound which contains unstable combinations of ionic valences in bulk form.
KW - magnetic metal
KW - nonequilibrium phases
KW - perovskite
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U2 - 10.1021/cm302231k
DO - 10.1021/cm302231k
M3 - Article
AN - SCOPUS:84867380056
SN - 0897-4756
VL - 24
SP - 3746
EP - 3750
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 19
ER -