Atomic scale studies of La/Sr ordering in colossal magnetoresistant La2-2xSr1+2xMn2O7 single crystals

Roldan, Manuel A.; Oxley, Mark P.; Li, Qing'an A.; Zheng, Hong; Gray, Kenneth E.; Mitchell, John F.; Pennycook, Stephen J.; Varela, Maria

doi:10.1017/S1431927614013075

Title: Atomic scale studies of La/Sr ordering in colossal magnetoresistant La_2-2xSr_1+2xMn₂O₇ single crystals

Abstract

In this study, it is unclear whether chemical order (or disorder) is in any way connected to double exchange, electronic phase separation, or charge ordering (CO) in manganites. In this work, we carry out an atomic resolution study of the colossal magnetoresistant manganite La_2–2xSr_1+2xMn₂O₇ (LSMO). We combine aberration-corrected electron microscopy and spectroscopy with spectroscopic image simulations, to analyze cation ordering at the atomic scale in real space in a number of LSMO single crystals. We compare three different compositions within the phase diagram: a ferromagnetic metallic material (x=0.36), an insulating, antiferromagnetic charge ordered (AF-CO) compound (x=0.5), which also exhibits orbital ordering, and an additional AF sample (x=0.56). Detailed image simulations are essential to accurately quantify the degree of chemical ordering of these samples. We find a significant degree of long-range chemical ordering in all cases, which increases in the AF-CO range. However, the degree of ordering is never complete nor can it explain the strongly correlated underlying ordering phenomena. Our results show that chemical ordering over distinct crystallographic sites is not needed for electronic ordering phenomena to appear in manganites, and cannot by itself explain the complex electronic behavior of LSMO.

Authors:

Roldan, Manuel A. ^[1]; Oxley, Mark P. ^[2]; Li, Qing'an A. ^[3]; Zheng, Hong ^[3]; Gray, Kenneth E. ^[3]; Mitchell, John F. ^[3]; Pennycook, Stephen J. ^[4]; Varela, Maria ^[1]

Univ. Complutense de Madrid, Madrid (Spain); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Vanderbilt Univ., Nashville, TN (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Tennessee, Knoxville, TN (United States)

Publication Date:: Mon Sep 29 00:00:00 EDT 2014

Research Org.:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1185388

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Microscopy and Microanalysis

Additional Journal Information:: Journal Volume: 20; Journal Issue: 06; Journal ID: ISSN 1431-9276

Publisher:: Microscopy Society of America (MSA)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; colossal magnetoresistance; scanning transmission electron microscopy; complex oxides; electron energy-loss spectroscopy

Citation Formats


                    Roldan, Manuel A., Oxley, Mark P., Li, Qing'an A., Zheng, Hong, Gray, Kenneth E., Mitchell, John F., Pennycook, Stephen J., and Varela, Maria. Atomic scale studies of La/Sr ordering in colossal magnetoresistant La2-2xSr1+2xMn2O7 single crystals.  United States: N. p., 2014. 
Web.  doi:10.1017/S1431927614013075.

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                    Roldan, Manuel A., Oxley, Mark P., Li, Qing'an A., Zheng, Hong, Gray, Kenneth E., Mitchell, John F., Pennycook, Stephen J., & Varela, Maria. Atomic scale studies of La/Sr ordering in colossal magnetoresistant La2-2xSr1+2xMn2O7 single crystals.  United States.  https://doi.org/10.1017/S1431927614013075

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                    Roldan, Manuel A., Oxley, Mark P., Li, Qing'an A., Zheng, Hong, Gray, Kenneth E., Mitchell, John F., Pennycook, Stephen J., and Varela, Maria. Mon .  
"Atomic scale studies of La/Sr ordering in colossal magnetoresistant La2-2xSr1+2xMn2O7 single crystals".  United States.  https://doi.org/10.1017/S1431927614013075.  https://www.osti.gov/servlets/purl/1185388.

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@article{osti_1185388,

  title        = {Atomic scale studies of La/Sr ordering in colossal magnetoresistant La2-2xSr1+2xMn2O7 single crystals},

  author       = {Roldan, Manuel A. and Oxley, Mark P. and Li, Qing'an A. and Zheng, Hong and Gray, Kenneth E. and Mitchell, John F. and Pennycook, Stephen J. and Varela, Maria},

  abstractNote = {In this study, it is unclear whether chemical order (or disorder) is in any way connected to double exchange, electronic phase separation, or charge ordering (CO) in manganites. In this work, we carry out an atomic resolution study of the colossal magnetoresistant manganite La2–2xSr1+2xMn2O7 (LSMO). We combine aberration-corrected electron microscopy and spectroscopy with spectroscopic image simulations, to analyze cation ordering at the atomic scale in real space in a number of LSMO single crystals. We compare three different compositions within the phase diagram: a ferromagnetic metallic material (x=0.36), an insulating, antiferromagnetic charge ordered (AF-CO) compound (x=0.5), which also exhibits orbital ordering, and an additional AF sample (x=0.56). Detailed image simulations are essential to accurately quantify the degree of chemical ordering of these samples. We find a significant degree of long-range chemical ordering in all cases, which increases in the AF-CO range. However, the degree of ordering is never complete nor can it explain the strongly correlated underlying ordering phenomena. Our results show that chemical ordering over distinct crystallographic sites is not needed for electronic ordering phenomena to appear in manganites, and cannot by itself explain the complex electronic behavior of LSMO.},

  doi          = {10.1017/S1431927614013075},

  journal      = {Microscopy and Microanalysis},

  number       = 06,

  volume       = 20,

  place        = {United States},

  year         = {Mon Sep 29 00:00:00 EDT 2014},

  month        = {Mon Sep 29 00:00:00 EDT 2014}

}

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Atomic Scale Studies of La/Sr Ordering in Colossal Magnetoresistant La_2-2xSr_1+2xMn₂O₇ Single Crystals

Journal Article Roldan, Manuel A. ; Oxley, Mark P. ; Li, Qing’an ; ... - Microscopy and Microanalysis

To date, it is unclear whether chemical order (or disorder) is in any way connected to double exchange, electronic phase separation, or charge ordering (CO) in manganites. In this work, we carry out an atomic resolution study of the colossal magnetoresistant manganite La_2-2xSr_1+2xMn₂O₇ (LSMO). We combine aberration-corrected electron microscopy and spectroscopy with spectroscopic image simulations, to analyze cation ordering at the atomic scale in real space in a number of LSMO single crystals. We compare three different compositions within the phase diagram: a ferromagnetic metallic material (x=0.36), an insulating, antiferromagnetic charge ordered (AF-CO) compound (x=0.5), which also exhibits orbital ordering,more »« less

https://doi.org/10.1017/S1431927614013075

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We report on the temperature dependence of the crystal and magnetic structure of the layered colossal magnetoresistive manganite, La{sub 2{minus}2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7}, x=0.3. Neutron-diffraction measurements show that the insulator-metal (IM) transition (T{sub IM}) at {approximately}100 K is accompanied by a ferromagnetic (FM) ordering of spins within MnO{sub 6} bilayers ({ital intrabilayer} coupling), but with an antiferromagnetic coupling between neighboring bilayers ({ital interbilayer} coupling). Below T{sub IM}, the Mn spins rotate from {approximately}45{degree} inclination to the {ital c} axis until they are almost parallel to the {ital c} axis at 5 K. Coincident with this spin reorientation, a FM {italmore »« less

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In sharp contrast to the three-dimensional perovskite manganite, evidence of charge-ordered structures with bi-stripe models has been found on the bilayered manganite La{sub 2-2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7} based on in-situ electron microscopic studies. At the electronic doping level of x=0.6, a new face-centered charge-ordered superstructure was observed. This structure is composed of bi-stripes of Mn{sup 3+}O{sub 6} and paired Mn{sup 4+}O{sub 6} rows alternatively stacking along the ordering direction, which is assembled from the building blocks of the charge-ordered phase at x=0.5. Taking into account the systematic absence of reflections with the face-centered symmetry, its modulation vector was deduced asmore »« less

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Similar Records

Title: Atomic scale studies of La/Sr ordering in colossal magnetoresistant La2-2xSr1+2xMn2O7 single crystals

Abstract

Citation Formats

Metal-insulator transitions journal, October 1998

Reentrant Orbital Order and the True Ground State of LaSr 2 Mn 2 O 7 journal, April 2007

Structural Evolution and Electronic Properties of La 1+ x Sr 2- x Mn 2 O 7 journal, January 1997

Layered Ruddlesden−Popper Manganese Oxides: Synthesis and Cation Ordering journal, February 1997

Change in charge and orbital alignment upon antiferromagnetic transition in the A -site-ordered perovskite manganese oxide R BaMn 2 O 6 ( R = Tb and Sm) journal, October 2002

Low Temperature Magnetoresistance and the Magnetic Phase Diagram of La 1 − x Ca x MnO 3 journal, October 1995

Colossal magnetoresistant materials: the key role of phase separation journal, April 2001

The current spin on manganites journal, October 2007

Theory of the Role of Covalence in the Perovskite-Type Manganites [ La , M ( II ) ] Mn O 3 journal, October 1955

Thousandfold Change in Resistivity in Magnetoresistive La-Ca-Mn-O Films journal, April 1994

Interplane Tunneling Magnetoresistance in a Layered Manganite Crystal journal, December 1996

Relation between Crystal and Magnetic Structures of Layered Manganite La 2 - 2 x Sr 1 + 2 x Mn 2 O 7 ( 0.30 ≤ x ≤ 0.50 ) journal, June 2000

Are high-temperature superconductors exotic? journal, March 2006

Charge and orbital ordered phases of La 2 − 2 x Sr 1 + 2 x Mn 2 O 7 − δ journal, October 2008

Delocalization of the effective interaction for inner-shell ionization in crystals journal, February 1998

Spin, Charge, and Lattice States in Layered Magnetoresistive Oxides journal, November 2001

Mapping chemical and bonding information using multivariate analysis of electron energy-loss spectrum images journal, October 2006

STEM-EELS imaging of complex oxides and interfaces journal, January 2012

Complexity in Strongly Correlated Electronic Systems journal, July 2005

The physics of manganites: Structure and transport journal, August 2001

Study of the Layered Magnetoresistive Perovskite La 1.2 Sr 1.8 Mn 2 O 7 by High-Resolution Electron Microscopy and Synchrotron X-ray Powder Diffraction journal, August 1997

Lattice-resolution contrast from a focused coherent electron probe. Part I journal, July 2003

Title: Atomic scale studies of La/Sr ordering in colossal magnetoresistant La_2-2xSr_1+2xMn₂O₇ single crystals

Metal-insulator transitions
journal, October 1998

Reentrant Orbital Order and the True Ground State of ${LaSr}_{2} {Mn}_{2} O_{7}$
journal, April 2007

Structural Evolution and Electronic Properties of La _{1+ x} Sr _{2- x} Mn ₂ O ₇
journal, January 1997

Layered Ruddlesden−Popper Manganese Oxides: Synthesis and Cation Ordering
journal, February 1997

Change in charge and orbital alignment upon antiferromagnetic transition in the A -site-ordered perovskite manganese oxide $R {BaMn}_{2} O_{6}$ $(R = Tb$ and Sm)
journal, October 2002

Low Temperature Magnetoresistance and the Magnetic Phase Diagram of ${La}_{1 - x} {Ca}_{x} {MnO}_{3}$
journal, October 1995

Colossal magnetoresistant materials: the key role of phase separation
journal, April 2001

The current spin on manganites
journal, October 2007

Theory of the Role of Covalence in the Perovskite-Type Manganites $[La, M (II)] Mn O_{3}$
journal, October 1955

Thousandfold Change in Resistivity in Magnetoresistive La-Ca-Mn-O Films
journal, April 1994

Interplane Tunneling Magnetoresistance in a Layered Manganite Crystal
journal, December 1996

Relation between Crystal and Magnetic Structures of Layered Manganite La _{2 - 2 x} Sr _{1 + 2 x} Mn ₂ O ₇ ( 0.30 ≤ x ≤ 0.50 )
journal, June 2000

Are high-temperature superconductors exotic?
journal, March 2006

Charge and orbital ordered phases of ${La}_{2 - 2 x} {Sr}_{1 + 2 x} {Mn}_{2} O_{7 - δ}$
journal, October 2008

Delocalization of the effective interaction for inner-shell ionization in crystals
journal, February 1998

Spin, Charge, and Lattice States in Layered Magnetoresistive Oxides
journal, November 2001

Mapping chemical and bonding information using multivariate analysis of electron energy-loss spectrum images
journal, October 2006

STEM-EELS imaging of complex oxides and interfaces
journal, January 2012

Complexity in Strongly Correlated Electronic Systems
journal, July 2005

The physics of manganites: Structure and transport
journal, August 2001

Study of the Layered Magnetoresistive Perovskite La _1.2 Sr _1.8 Mn ₂ O ₇ by High-Resolution Electron Microscopy and Synchrotron X-ray Powder Diffraction
journal, August 1997

Lattice-resolution contrast from a focused coherent electron probe. Part I
journal, July 2003