Particle size effects on interplay between charge ordering and magnetic properties in nanosized<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">La</mml:mi><mml:mn>0.25</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Ca</mml:mi><mml:mn>0.75</mml:mn></mml:msub><mml:mi mathvariant="normal">Mn</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Zhang, T.; Zhou, T. F.; Qian, Tian; Li, X. G.

doi:10.1103/physrevb.76.174415

Cited by 127 publications

(44 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For further studying, the spectra were analyzed by peak deconvolution that includes three components of Mn 4+ , Mn 3+ and satellite. The analyzing results clearly display the presence of these components for all samples, and the binding energies of Mn 4+ and Mn 3+ components are in turn close to the previously known values of 642.5 and 641.2 eV [13,18]. The Mn 4 + content is estimated of 43.1%, 38.8% and 33.2% for S0, S4 and S8, respectively.…”

supporting

confidence: 51%

“…Nevertheless, it appears that the different processing routes may additionally introduce various defects into the grain boundary, resulting in dissimilar properties [13]. These defects may be the failure of crystal lattice, oxygen deficiencies, dislocations, and so on.…”

Section: Introductionmentioning

confidence: 99%

“…The Mn 4 + content is estimated of 43.1%, 38.8% and 33.2% for S0, S4 and S8, respectively. This indicates the Mn 4+ content (and hence the amount of oxygen deficiencies) tends to decrease (increase) with decreasing particle size gained by mechanical grinding; meanwhile this situation does not appear for that gained by varying of sintering temperature [13].…”

mentioning

confidence: 96%

See 2 more Smart Citations

Influence of Grinding Particle Size on Structure and Electrical Properties of La_0.67Sr_0.33MnO_3−δCompound

Le-Van

Tang

et al. 2015

Materials and Manufacturing Processes

View full text Add to dashboard Cite

In this paper, the influences of grinding particle size on the structure and electrical transport properties of La 0 . 67 Sr 033 MnO 3-,5 compound have been investigated. The compound was prepared by gel combustion process followed by grinding for different duration time. It was found that the lattice parameters, unit-cell volume, strain, oxygen deficiency, and temperature dependence of resistivity p-T increase with decreasing particle size. The p-T growth can be explained by the increasing contribution of the grain boundary effect, strain, and even oxygen deficiency. The electrical transport mechanism over the whole temperature range of 100-400 K was thoroughly described by applying the phase separation model around the phase transition temperature T P . This model was subsequently employed to calculate the p-T at high temperature up to 1000 K. The result showed there was a second phase transition at a typical temperature T*>T P , which could be attributed to the relaxation of small polarons to large ones. This relaxation occurred at lower temperatures when the particle size decreased. It might be due to the decrease in conduction bandwidth caused by the defects arisen during the grinding.

show abstract

supporting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Grinding Particle Size on Structure and Electrical Properties of La_0.67Sr_0.33MnO_3−δCompound

Le-Van

Tang

et al. 2015

Materials and Manufacturing Processes

View full text Add to dashboard Cite

show abstract

“…meanwhile more disordered surface spins weaken the FM coupling [45,46], thereby giving rise to decreased H EB and coercivity. We rationally believe that the increase in M A N U S C R I P T…”

Section: Resultsmentioning

confidence: 98%

EDTA-assisted hydrothermal synthesis and magnetic properties of urchin-like YbMn2O5 microspheres

2015

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…at 5 K is observed. At the same time, data by Zhang et al [3] evidence that AFM/CO state continues to exist in electron-doped La Ca MnO nano-powders, while the CO transition gradually shifts to lower temperatures and becomes wider upon decrease of particle size. It is commonly accepted now that mixed valence doped manganites are characterized by strong coupling of spin, charge, and lattice degrees of freedom [4].…”

Section: T He Magnetic Ground State In Electron-doped Lamentioning

confidence: 87%

Comparative Study of Magnetic Ordering in Bulk and Nano-Grained La$_{0.4}$Ca$_{0.6}$MnO$_{3}$ Manganite

et al. 2008

View full text Add to dashboard Cite

To explore the size effect in electron-doped La 0 4 Ca 0 6 MnO 3 (LCMO) compound, dc magnetic measurements and electron magnetic resonance were carried out with bulk and nano-grained LCMO in temperature ranges 5 K 350 K and 5 K 600 K, respectively. It appears that the antiferromagnetic, charge ordered state remains stable upon the reduction of the samples size down to nanometer scale. However, the low-temperature ferromagnetic (FM) component enhances in nano-grained LCMO as compared to its bulk counterpart, supposedly due to strong surface and inter-grain interaction effects. FM correlations in bulk and nano crystals are strong at paramagnetic (PM) state, which seems to be an electron-doping effect. The domination of ion-ion spin relaxation mechanism in PM state and drastic fading of the FM correlations upon cooling means that the doped electrons are localized in both bulk and nanograined LCMO. The notable influence of the oxygen stoichiometry on magnetic ordering in LCMO, revealed in this work, may explain the contradictive data on the magnetic state of nano-crystalline LCMO reported in the literature. Index Terms-Magneticresonance, magnetization processes, manganese compounds, nanotechnology. T HE magnetic ground state in electron-doped La Ca MnO manganites is characterized by strong antiferromagnetic (AFM) component. The charge ordered (CO) state appears in such manganites upon heating. In particular, bulk La Ca MnO (LCMO) compound shows the critical temperatures of the AFM and CO phase transitions 150 K and 260 K, respectively [1]. It was reported [2] that the LCMO powders with mean grain size about 60 and 20 nm demonstrate dramatic change in their magnetic ordering as compared to bulk, i.e., ferromagnetic (FM) like ground state with spontaneous magnetization 1 /f.u. at 5 K is observed. At the same time, data by Zhang et al. [3] evidence that AFM/CO state continues to exist in electron-doped La Ca MnO nano-powders, while the CO transition gradually shifts to lower temperatures and becomes wider upon decrease of particle size. It is commonly accepted now that mixed valence doped manganites are characterized by strong coupling of spin, charge, and lattice degrees of freedom [4]. This means that magnetic/electronic ordering of such compounds may really be sensitive to a reduction of the samples dimensions down to nanometer size scale due to, e.g., spin-lattice coupling. The recent results, obtained on hole-doped La Ca MnO , definitely show that nano-powder has notably different FM like magnetic ground state as compared to the mixed one in its bulk counterpart [5], while both nano and bulk samples are characterized by about the same FM order [6], i.e., the tendency of weakening of the size-induced effects on magnetic ordering upon its stabilization is observed. The AFM/CO order in electron-doped La Ca MnO manganites is known to be very stable regarding external Digital Object Identifier 10.1109/TMAG.2008.2002197 perturbations [4]. This allows one to conclude that the above noted data by Lu et al. [2] seems to be...

show abstract

Particle size effects on interplay between charge ordering and magnetic properties in nanosizedLa0.25Ca0.75MnO3

Cited by 127 publications

References 30 publications

Influence of Grinding Particle Size on Structure and Electrical Properties of La_0.67Sr_0.33MnO_3−δCompound

Influence of Grinding Particle Size on Structure and Electrical Properties of La_0.67Sr_0.33MnO_3−δCompound

EDTA-assisted hydrothermal synthesis and magnetic properties of urchin-like YbMn2O5 microspheres

Comparative Study of Magnetic Ordering in Bulk and Nano-Grained La$_{0.4}$Ca$_{0.6}$MnO$_{3}$ Manganite

Contact Info

Product

Resources

About

Particle size effects on interplay between charge ordering and magnetic properties in nanosizedLa0.25Ca0.75MnO3

Cited by 127 publications

References 30 publications

Influence of Grinding Particle Size on Structure and Electrical Properties of La0.67Sr0.33MnO3−δCompound

Influence of Grinding Particle Size on Structure and Electrical Properties of La0.67Sr0.33MnO3−δCompound

EDTA-assisted hydrothermal synthesis and magnetic properties of urchin-like YbMn2O5 microspheres

Comparative Study of Magnetic Ordering in Bulk and Nano-Grained La$_{0.4}$Ca$_{0.6}$MnO$_{3}$ Manganite

Contact Info

Product

Resources

About

Influence of Grinding Particle Size on Structure and Electrical Properties of La_0.67Sr_0.33MnO_3−δCompound

Influence of Grinding Particle Size on Structure and Electrical Properties of La_0.67Sr_0.33MnO_3−δCompound