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Title: Real-Space Study of Charge and Orbital Ordering in La0.6Sr2.4Mn2O7 Manganite Single Crystal

Journal Article · · Microscopy and Microanalysis
 [1];  [2];  [2];  [1];  [1];  [2];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)

Charge and orbital ordering often occur in strongly correlated materials involving cations with multivalence states. This order is related to various interesting physical phenomena in perovskite-structured and related oxides, such as superconductivity and colossal magnetoresistance [1,2]. The n = 2 Ruddlesden-Popper phase La2-2xSr1+2xMn2O7 (LSMO), which is comprised of perovskite-like (La, Sr)MnO3 bilayers separated by a rock-salt-like (La, Sr)O layer along [001], represents one of the most interesting manganites where its charge and orbital ordering can be tuned by varying x. In its phase diagram [3,4], previous studies revealed a narrow region with 0.66 ≤ x ≤ 0.72 that showed no long-range magnetic ordering, while the regions with x below 0.66 and above 0.72 exhibited clear different longrange magnetic ordering behaviors owing to charge/orbital ordering in the lattice.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1495973
Journal Information:
Microscopy and Microanalysis, Vol. 24, Issue S1; ISSN 1431-9276
Publisher:
Microscopy Society of America (MSA)Copyright Statement
Country of Publication:
United States
Language:
English

References (5)

Giant magnetoresistance of manganese oxides with a layered perovskite structure journal March 1996
Interplay of spin and orbital ordering in the layered colossal magnetoresistance manganite La 2 2 x Sr 1 + 2 x Mn 2 O 7 ( 0.5 <~ x <~ 1 . 0 ) journal December 2000
Magnetic phase diagram of layered manganites in the highly doped regime journal June 2001
Atomic-resolution imaging of oxidation states in manganites journal February 2009
Oxidation state and chemical shift investigation in transition metal oxides by EELS journal May 2012