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  • AIP Publishing  (27)
  • Sun, J. R.  (27)
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  • AIP Publishing  (27)
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  • 1
    Online Resource
    Online Resource
    Buffer layer-induced positive magnetoresistance in manganite-based heterojunctions
    AIP Publishing ; 2012
    In:  Journal of Applied Physics Vol. 111, No. 7 ( 2012-04-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 111, No. 7 ( 2012-04-01)
    Abstract: Effects of the LaMnO3 (LMO) buffer layer on the magnetoresistive behaviors of La0.67A0.33MnO3/LaMnO3/SrTiO3:0.05 wt% Nb (LAMO/LMO/STON, A = Ca, Sr) have been experimentally studied. In addition to an enhanced response to a magnetic field, the current-voltage relations show a downward shift in magnetic field, indicating an increase of the junction resistance. It is completely different from that observed in the junctions without buffer layer. The positive magnetoresistance (MR) is strongly dependent on the thickness of the LMO layer, increasing first then decreasing with the increase of layer thickness. Furthermore, it is significantly stronger in LCMO/LMO/STON than in LSMO/LMO/STON. The maximal MR at 50 K is ∼90% for LCMO/LMO/STON and ∼52% for LSMO/LMO/STON, occurring at the LMO thickness of 4 nm under the field of 5 T. The MR persists up to 350 K, and it is ∼30% and ∼24% for the LCMO and LSMO junctions, respectively. An analysis of the current-voltage characteristics indicates an increase in interfacial barrier in magnetic field, which is the origin for the positive MR.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3673858
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 2
    Online Resource
    Online Resource
    Effect of temperature on the La1-xCaxMnO3/SrTiO3:Nb (x=–0.75) heterojunctions
    AIP Publishing ; 2010
    In:  Applied Physics Letters Vol. 97, No. 2 ( 2010-07-12)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 97, No. 2 ( 2010-07-12)
    Abstract: Influence of temperature on the La1-xCaxMnO3/SrTiO3:Nb heterojunctions with the Ca content ranging from 0 to 0.75 has been experimentally studied. Obvious temperature effect occurs in the junction with a Ca content of 0.1. As experimentally shown, the interfacial barrier is insensitive to temperature below 340 K, and experiences a decrease from ∼1.24 to 0.85 eV as temperature grows from 340 to 375 K. However, the temperature effect in other junctions is weak, and the energy barrier change is typically ∼0.03–0.08 eV. In the scenario of temperature-driven orbital order-disorder transition in the La0.9Ca0.1MnO3 film, the temperature effect can be qualitatively understood.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3462322
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 3
    Online Resource
    Online Resource
    Interfacial barrier in manganite junctions with different crystallographic orientations
    AIP Publishing ; 2010
    In:  Applied Physics Letters Vol. 96, No. 26 ( 2010-06-28)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 96, No. 26 ( 2010-06-28)
    Abstract: We performed a comprehensive study on the La1−xCaxMnO3/SrTiO3:Nb junctions with different hole content and film thickness. It is found that the interfacial barrier, which determines the physical properties of the junctions, shows a strong dependence on crystallographic orientation, and it is substantially higher for the (110) than for the (100)-orientated junctions. The difference in barrier height is further found to exhibit a systematic variation with Ca content and film thickness (t). It reduces from ∼0.09 to 0.02 eV for a x increase from 0.1 to 1 with a fixed t=200 nm, and experiences a growth by ∼0.06 eV corresponding to the variation in t from 10 to 160 nm for a constant x=0.33. Similar phenomena have been observed in the La0.67Ba0.33MnO3/SrTiO3:Nb junctions. In the scenario of different polarity mismatches at the (100) and (110) interfaces in the two series of junctions, these results can be qualitatively understood.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3447797
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 4
    Online Resource
    Online Resource
    Anomalous Hall effect of CeFe1.95Al0.05 in the vicinity of the metamagnetic transition
    AIP Publishing ; 2008
    In:  Journal of Applied Physics Vol. 103, No. 7 ( 2008-04-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 103, No. 7 ( 2008-04-01)
    Abstract: The essence of the anomalous Hall effect (AHE) is not fully understood and it still attracts considerable attention. Magnetic and magnetotransport properties of CeFe1.95Al0.05 compound in diverse magnetic state are studied which is helpful to know the essence of AHE. The semiempirical relation ρxy=R0B+4πRsM, widely accepted, is valid in describing the behaviors of AHE in ferromagnetic and paramagnetic state, but invalid in antiferromagnetic state in CeFe1.95Al0.05 compound.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.2828515
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
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  • 5
    Online Resource
    Online Resource
    Magnetocaloric effects in the La(Fe,Si)13 intermetallics doped by different elements
    AIP Publishing ; 2009
    In:  Journal of Applied Physics Vol. 105, No. 7 ( 2009-04-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 105, No. 7 ( 2009-04-01)
    Abstract: The magnetocaloric effects (MCEs) of LaFe13−xSix compounds doped by magnetic rare earths (R=Ce, Pr, and Nd) and transition metal (Co) are analyzed. It is found that varying the contents of R and Fe produces similar effects on the MCE, both of which cause a rapid decrease in ΔS with the increase in TC. The ΔS−TC relations thus obtained coincide with each other fairly well, which indicates the equivalence of substituting R for La and Fe for Si. In contrast, partially replacing Fe by Co leads to a slow decrease in ΔS with TC. It is therefore a promising approach to maintain a large ΔS up to high temperatures. As a comparison with these element-doping compounds, the MCEs of hydrides are also discussed. Although interstitial hydrogen can also keep up a large ΔS to high temperatures, the corresponding hydrides are unfortunately unstable above 150 °C. Based on these analyses, the potential refrigerants made of LaFe13−xSix are proposed to have as low as possible Si content (or high R content) and proper Co content simultaneously.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3072021
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 6
    Online Resource
    Online Resource
    Crystallinity dependence of resistance switching in La0.7Ca0.3MnO3 films grown by pulsed laser deposition
    AIP Publishing ; 2009
    In:  Journal of Applied Physics Vol. 105, No. 6 ( 2009-03-15)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 105, No. 6 ( 2009-03-15)
    Abstract: Resistance switching property induced by pulsed electric-field in metal-oxide-metal sandwiches attracted much interest due to its potential application in nonvolatile memory devices. In this paper, the influence of the crystallinity of La0.7Ca0.3MnO3 (LCMO) film on the resistance switching of Ag-LCMO-Pt sandwiches has been investigated. LCMO films were grown on Pt/Ti/SiO2/Si substrates using pulsed laser deposition technique at different substrate temperatures. The crystallinity of LCMO films were characterized by x-ray diffraction, atomic force microscopy, transmission electron microscopy, and x-ray photoelectron microscopy. The results show that the crystallinity of LCMO films changed from the amorphous phase to (200) oriented nanocrystalline grains by varying the deposition temperature from 500 to 700 °C. The amorphous LCMO films were crystallized through rapid thermal annealing process under oxygen atmosphere. The coexistence of crystalline grains and grain boundaries results in the inhomogenous conductivity in LCMO films. Current-voltage characteristics and pulsed bias measurements indicate that nonvolatile resistance switching only takes place in the crystallized LCMO films and the resistance change ratio depends on the grain size of LCMO films. These results were described as the electric field induced oxygen vacancy annihilation/generation combined with the change of electron/hole trap density at the local interface between the Ag electrode and the crystalline grains in the LCMO film.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3082762
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 7
    Online Resource
    Online Resource
    Anisotropic conduction induced by current processing in the La0.8Ca0.2MnO3 film
    AIP Publishing ; 2006
    In:  Applied Physics Letters Vol. 89, No. 17 ( 2006-10-23)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 89, No. 17 ( 2006-10-23)
    Abstract: Effects of current processing have been experimentally studied for the La0.8Ca0.2MnO3 film. An anisotropic conduction is observed when the film is processed by a current of the density of ∼2.4×105A∕cm2. Difference between the resistances in the direction of the processing current and the reverse direction can be as high as 10 000%. Different from the original film, which exhibits a metal-to-insulator transition at ∼214K, the sample becomes insulating below 300K under low voltage bias and undergoes a metallic transition at very different temperatures in the two directions when the voltage bias is high enough. These features remain after reordering the electrodes, which reveals the intrinsic origin of the anisotropy, instead of interfacial barrier due to current processing.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2369844
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 8
    Online Resource
    Online Resource
    Buffer-layer-enhanced magnetic field effect in La0.5Ca0.5MnO3/LaMnO3/SrTiO3:Nb heterojunctions
    AIP Publishing ; 2011
    In:  Journal of Applied Physics Vol. 109, No. 7 ( 2011-04-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 109, No. 7 ( 2011-04-01)
    Abstract: The transport behaviors of La0.5Ca0.5MnO3/LaMnO3/SrTiO3:Nb heterojunctions with a LaMnO3 layer thickness of between 0 and 12 nm have been systematically studied. The effect of the magnetic field on the junction without the buffer layer is weak. The influence of the magnetic field on the junction is maximized when the layer thickness is ∼3 nm, demonstrated by a significant field-induced increase in current when the bias voltage is fixed. The corresponding magnetoresistance of the junction is negative, and its maximal value is ∼−32% for a field change of 5 T at 80 K. Based on a quantitative analysis of the current-voltage characteristics, the interfacial barrier can be derived, and it shows a complex variation with an increase in layer thickness, first decreasing and then increasing. This is the apparent reason for the change in buffer-layer-enhanced negative magnetoresistance of the junctions for different layer thicknesses.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3562916
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
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  • 9
    Online Resource
    Online Resource
    Electronic transport of the manganite-based heterojunction with high carrier concentrations
    AIP Publishing ; 2007
    In:  Applied Physics Letters Vol. 90, No. 19 ( 2007-05-07)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 90, No. 19 ( 2007-05-07)
    Abstract: The transport property of the manganite heterojunction La0.9Ca0.1MnO3+δ∕SrTiO3 (doped by 1wt%Nb) has been experimentally studied. The most important results of the present work are the discovery of the charge tunneling-dominated transport process, characterized by the appearance of the rectifying behaviors fairly described by the Newman equation I∝exp(αT)exp(βV) in a considerable temperature range (α and β are constants, and I and V are current and voltage, respectively). Significant modification of magnetic field to charge tunneling is also observed. It is believed that magnetic field depresses junction resistance by reducing depletion width of the junction.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2728750
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2007
    detail.hit.zdb_id: 211245-0
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  • 10
    Online Resource
    Online Resource
    Volume dependence of the magnetic coupling in LaFe13−xSix based compounds
    AIP Publishing ; 2008
    In:  Applied Physics Letters Vol. 92, No. 10 ( 2008-03-10)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 92, No. 10 ( 2008-03-10)
    Abstract: The effects of pressure and hydrogenation, the former causes a lattice contraction while the latter causes an expansion of the sample, have been systematically studied for LaFe13−xSix (x=1.3–2.1). It is found that the typical change of the Curie temperature is ∼150K when ∼1.6H∕f.u. is absorbed and ∼−106K as the pressure sweeps from 0to1GPa. One of the most remarkable results of the present work is the presence of a universal relation between Curie temperature and phase volume. The former linearly grows with the increase of lattice constant (∼1510K∕Å), irrespective of how the phase volume is modified. This result implies the exclusive dependence of the magnetic coupling in LaFe13−xSix on the Fe–Fe distances and the interstitial hydrogen does not affect the electronic structure of the compounds.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2894194
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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