Surface spin-glass behavior in La2/3Sr1/3MnO3 nanoparticles

Zhu, Tao; Shen, B. G.; Sun, J. R.; Zhao, H. W.; Wang, Zhan

doi:10.1063/1.1379597

Cited by 142 publications

(112 citation statements)

References 15 publications

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“…More critical observation of the low-temperature Mössbauer data ͑12 and 4 K͒ revealed some very weak signal of sextet hyperfine splitting. Due to the low magnetic moment value for the sample and very small natural abundance of 57 Fe, the intensity of the observed signal is very weak. However, a more detailed fitting of the experimental data for 12 K in Fig.…”

Section: Mössbauer Spectroscopymentioning

confidence: 99%

“…In addition to this, the technique is used to extract information about the oxidation state of the dopant cation involved in the spin coupling. 44,[57][58][59] Figures 8͑a͒ and 8͑b͒ show the EPR spectra of Zn 0.9 Fe 0.1 O recorded at room temperature and at 100 K. Both of the EPR spectra of Zn 0.9 Fe 0.1 O can be considered as a superposition of two overlapping signals, an intense and broad Gaussian signal ͑⌬H pp = 1675 G͒ with effective g factor g eff = 2.126 and another weak and narrow Lorentzian signal with g eff = 2.005. For the sake of convenience, the broad and narrow signals are designated as signal A ͑g eff = 2.126͒ and signal B ͑g eff = 2.005͒, respectively.…”

Section: Epr Measurementsmentioning

confidence: 99%

“…The 57 Fe Mössbauer spectra were recorded using a conventional constant acceleration velocity drive and the temperature was varied in the range 4 -300 K using a continuous flow cryostat. The spectra were recorded in transmission geometry with a 57 Co͑Rh͒ source.…”

Section: Mössbauer Spectroscopymentioning

confidence: 99%

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Ferromagnetism in Fe-doped ZnO nanocrystals: Experiment and theory

et al. 2007

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Fe-doped ZnO nanocrystals are successfully synthesized and structurally characterized by using x-ray diffraction and transmission electron microscopy. Magnetization measurements on the same system reveal a ferromagnetic to paramagnetic transition temperature above 450 K with a low-temperature transition from the ferromagnetic to the spin-glass state due to canting of the disordered surface spins in the nanoparticle system. Local magnetic probes like electron paramagnetic resonance and Mössbauer spectroscopy indicate the presence of Fe in both valence states Fe 2+ and Fe 3+ . We argue that the presence of Fe 3+ is due to possible hole doping in the system by cation ͑Zn͒ vacancies. In a subsequent ab initio electronic structure calculation, the effects of defects ͑e.g., O and Zn vacancies͒ on the nature and origin of ferromagnetism are investigated for the Fe-doped ZnO system. Electronic structure calculations suggest hole doping ͑Zn vacancy͒ to be more effective to stabilize ferromagnetism in Fe-doped ZnO and our results are consistent with the experimental signature of hole doping in ferromagnetic Fe-doped ZnO samples.

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Section: Mössbauer Spectroscopymentioning

confidence: 99%

Section: Epr Measurementsmentioning

confidence: 99%

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Ferromagnetism in Fe-doped ZnO nanocrystals: Experiment and theory

et al. 2007

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“…These features make manganites the ideal system in which to study edge state physics among complex oxides systems. Although surface [11][12][13] and grain boundary effects [14][15][16][17] have been observed in manganites systems, it is very interesting to verify whether broken symmetry effect can introduce intrinsic edge states in manganites, especially when EPS dominates the system. For this reason, we have chosen a model system of La 0.325 Pr 0.3 Ca 0.375 MnO 3 (LPCMO) which has been well known for its striking large length scale EPS between ferromagnetic metallic (FM) and CE-type antiferromagnetic charge-ordered insulating (CE) phases 18 .…”

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confidence: 99%

Visualization of a ferromagnetic metallic edge state in manganite strips

Zhang

Dong

et al. 2015

Nat Commun

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Recently, broken symmetry effect induced edge states in two-dimensional electronic systems have attracted great attention. However, whether edge states may exist in strongly correlated oxides is not yet known. In this work, using perovskite manganites as prototype systems, we demonstrate that edge states do exist in strongly correlated oxides. Distinct appearance of ferromagnetic metallic phase is observed along the edge of manganite strips by magnetic force microscopy. The edge states have strong influence on the transport properties of the strips, leading to higher metal-insulator transition temperatures and lower resistivity in narrower strips. Model calculations show that the edge states are associated with the broken symmetry effect of the antiferromagnetic charge-ordered states in manganites. Besides providing a new understanding of the broken symmetry effect in complex oxides, our discoveries indicate that novel edge state physics may exist in strongly correlated oxides beyond the current two-dimensional electronic systems.

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“…There is also no irreversibility between ZFC and FC measurements, and this is in the more general terms thought due to the existence of short range ordering. 45 This ordering contributes differently to the total magnetization under ZFC and FC, thus provides nonoverlapping curves. The intraparticle interaction is also witnessed in the slight asymmetric loop shift of M-H curve under ZFC condition at 5 K (471 Oe, -563 Oe, inset, Fig.…”

Section: Resultsmentioning

confidence: 99%