PMID- 21825489
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20121002
LR  - 20110809
IS  - 0953-8984 (Print)
IS  - 0953-8984 (Linking)
VI  - 21
IP  - 19
DP  - 2009 May 13
TI  - Local structure of Sr(2)FeMo(x)W(1-x)O(6) double perovskites across the 
      composition-driven metal to insulator transition.
PG  - 195502
LID - 10.1088/0953-8984/21/19/195502 [doi]
AB  - Sr(2)FeMoO(6) oxides exhibit a half-metallic ferromagnetic (HM-FM) ground state 
      and peculiar magnetic and magnetotransport properties, which are interesting for 
      applications in the emerging field of spintronics and attractive for fundamental 
      research in the field of heavily correlated electron systems. Sr(2)FeWO(6) is an 
      insulator with an antiferromagnetic (I-AFM) ground state. The solid solutions 
      Sr(2)FeMo(x)W(1-x)O(6) also have peculiar properties-W doping enhances chemical 
      order which allows stabilization of the HM-FM state; as the W content exceeds a 
      certain value a metal to insulator transition (MIT) occurs. The role of W in 
      determining the physical properties of Sr(2)FeMo(x)W(1-x)O(6) systems has been a 
      matter of intense investigation. This work deals with the problem of the 
      structural and electronic changes related to the MIT from a local perspective by 
      means of x-ray absorption spectroscopy (XAS). This technique allows one to probe 
      in detail the local structure and electronic modifications around selected 
      absorber ions (W, Mo, Fe and Sr in our case). The results of XAS analysis in the 
      whole composition range (0</=x</=1), in the near edge (XANES) and extended (EXAFS) 
      regions, demonstrate an abrupt change of the local structure around the Fe and Mo 
      sites at the critical composition, x(c). This change represents the 
      microstructural counterpart associated with the MIT. Conversely, the local 
      structure and electronic configuration of W ions remain unaltered in the whole 
      composition range, suggesting indirect participation of W in the MIT.
FAU - Bardelli, F
AU  - Bardelli F
AD  - CNR-TASC laboratory c/o GILDA-ESRF Grenoble, France, 6 Rue J Horowitz, 38043 
      Grenoble cedex 9, France. Dipartimento di Fisica, Universita di 'Roma Tre', Via 
      della Vasca Navale 84, I-00146 Rome, Italy.
FAU - Meneghini, C
AU  - Meneghini C
FAU - Mobilio, S
AU  - Mobilio S
FAU - Ray, Sugata
AU  - Ray S
FAU - Sarma, D D
AU  - Sarma DD
LA  - eng
PT  - Journal Article
DEP - 20090407
PL  - England
TA  - J Phys Condens Matter
JT  - Journal of physics. Condensed matter : an Institute of Physics journal
JID - 101165248
EDAT- 2009/05/13 00:00
MHDA- 2009/05/13 00:01
CRDT- 2011/08/10 06:00
PHST- 2011/08/10 06:00 [entrez]
PHST- 2009/05/13 00:00 [pubmed]
PHST- 2009/05/13 00:01 [medline]
AID - S0953-8984(09)07533-X [pii]
AID - 10.1088/0953-8984/21/19/195502 [doi]
PST - ppublish
SO  - J Phys Condens Matter. 2009 May 13;21(19):195502. doi: 
      10.1088/0953-8984/21/19/195502. Epub 2009 Apr 7.