Author/Authors :
Asokan، نويسنده , , K. and Dong، نويسنده , , C.L. and Bao، نويسنده , , C.W. and Tsai، نويسنده , , H.M. and Chiou، نويسنده , , J.W. and Chang، نويسنده , , C.L. and Pong، نويسنده , , W.F. and Duran، نويسنده , , P. and Moure، نويسنده , , C. and Peٌa، نويسنده , , O.، نويسنده ,
Abstract :
Electronic structures of orthorhombic perovskite-type manganites (OM) and hexagonal manganites (HM) are compared by using X-ray absorption near edge structure spectroscopy. This study reveals that the environments around Mn and O ions in both the systems are different. These are reflected primarily in the lifting of degeneracy of the Mn 3d orbitals. Interestingly, the unoccupied Mn 3 d x 2 − y 2 orbital in HM is strongly hybridized with O 2p states and appears to be responsible for both long range orderings: ferroelectric ordering at high temperatures and ferromagnetic ordering at low temperatures.
Keywords :
C. XANES , A. Manganites , D. Electronic structure , E. X-ray absorption spectroscopy
