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  • 1
    Electronic Resource
    Electronic Resource
    Microstructural and physical properties of layered manganites oxides related to the magnetoresistive perovskites (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 5850-5856 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A structural and magnetoresistance study of layered manganites with nominal formula Ln2−yA1+yMn2O7 (Ln=Nd, Pr) (A=Ca, Sr, Ba) is presented. A combination of electron diffraction and high resolution microscopy allows us to propose a structural model where two perovskite blocks are intergrown with one rock salt type layer. The average structure crystallizes in a tetragonal unit cell with lattice parameters a≈b≈ap c≈19.3 A(ring). Moreover, an orthorhombic distortion of the tetragonal cell with lattice parameters a≈b≈(square root of)ap and c≈19.3 A(ring) has been evidenced for the calcium-based oxides. Different variants of the fundamental structure and intergrowth with the pseudocubic perovskite structure as well as stacking deviations are easily formed. The magnetoresistance effect is discussed in relation to the crystallographic data. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363578
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  • 2
    Electronic Resource
    Electronic Resource
    Cation size-temperature phase diagram of the manganites Ln0.5Sr0.5MnO3 (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 1372-1377 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the variation of the paramagnetic to ferromagnetic transition temperature TC and of the ferromagnetic to antiferromagnetic transition temperature TN as a function of the average size of the A site cations (Ln, Sr) in the manganite perovskites Ln0.5Sr0.5MnO3 (Ln=Gd, Sm, Y, Pr, La). For our investigation we used dc resistivity, magnetization, susceptibility and magnetoresistance measurements. Results show that the Curie temperature TC increases from 85 to 310 K when 〈rA〉 varies from 1.221 to 1.263 Å, whereas TN remains stable around 150 K. A magnetic phase diagram temperature-〈rA〉 has been established, allowing five regions with different magnetic behaviours to be evidenced: paramagnetic insulating, ferromagnetic metallic, antiferromagnetic insulating, canted antiferromagnetic metallic, and weak ferromagnetic insulating. The extension of these regions is determined by the value of the applied magnetic field. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363873
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  • 3
    Electronic Resource
    Electronic Resource
    Anomalous increase of resistivity against thermal cycling in some of the phase separated manganites (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 2422-2426 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate the effect of repeated thermal cycles in some of the Pr0.5Ca0.5Mn1−xMxO3 (M=Cr, Co, and Ni and x=0.02–0.05) compounds which undergo a spontaneous (H=0 T) insulator to metal transition below the temperature Tp driven by percolation of ferromagnetic clusters in a charge ordered background. The zero field resistivity (ρ) shows an anomalous behavior upon thermal cycling between a high-(TS)- and a low (TF)- temperature limit: While ρ for T(very-much-greater-than)Tp is unaffected, it increases significantly for T≤Tp and Tp shifts down each time upon thermal cycling. In contrast, ρ at a given temperature decreases slowly with time. The anomalous increase of resistivity depends upon the ratio of the charge ordered to ferromagnetic phase fraction and decreases with increasing x and the applied magnetic field (H). We also show that a similar effect can be obtained for Pr0.5Ca0.5Mn0.97Al0.03O3 and Pr0.55Ca0.45MnO3 under H=5 T although these compounds do not exhibit insulator–metal transition in zero field. The low field magnetization study on Pr0.5Ca0.5Mn0.98Cr0.02O3 suggests that the ferromagnetic Curie temperature remains unaffected, whereas the ferromagnetic phase fraction decreases with repeated cycles. We suggest that the observed anomaly is caused by an increase of interfacial strain between charge ordered and ferromagnetic phases. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1388171
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  • 4
    Electronic Resource
    Electronic Resource
    Stress-induced metallic behavior under magnetic field in Pr1−xCaxMnO3 (x=0.5 and 0.4) thin films (invited) (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 6612-6617 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated the role of the stress induced by the presence of the substrate in thin films of colossal magnetoresistive manganites on structural, resistive, and magnetic properties. Because of the strong coupling between the small structural distortions related to the charge ordering (CO) and the resistive properties, the presence of the substrate prevents the full development of the charge ordering in Pr0.5Ca0.5MnO3, especially in the very thin films. For thicker films, the CO state exists, but is not fully developed. Correlatively, the magnetic field which is necessary to suppress the CO is decreased drastically from 25 T to about 5 T on SrTiO3 substrates. We have also investigated the influence of the doping level by studying the case of Pr0.6Ca0.4MnO3. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1357134
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic properties of chromium doped rare earth manganites Ln0.5Ca0.5Mn1−xCrxO3 (Ln=Pr, Nd, Sm and 0.05≤x≤0.10) by soft x-ray magnetic circular dichroism (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 2616-2621 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Soft-x-ray magnetic circular dichroism (SXMCD) at Mn, Cr L2,3 and Ln M4,5 edges of Ln0.5Ca0.5Mn1−xCrxO3 (Ln=Pr, Nd, Sm and 0.05≤x≤0.10) bulk polycrystalline samples have been performed at T=20 K below the ferromagnetic Curie temperature. We show the existence of magnetic sublattice on each of the probed cations. Chromium cations order at low temperature antiparallel to the manganese subnetwork and rare earth cations likely exhibit a sperimagnetic ordering. These results are compared with magnetization measurements and a tentative correlation with magnetoresistance properties is discussed. This work also demonstrates that SXMCD can probe element and site specific magnetic properties of multicomponent systems. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371100
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  • 6
    Electronic Resource
    Electronic Resource
    Large domain wall magnetoresistance up to room temperature in La0.7Sr0.3MnO3 bridges with nanoconstrictions (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 6955-6957 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: To obtain low field magnetoresistance (MR) in manganites, we have introduced a geometrically constrained magnetic domain wall (DW) in La0.7Sr0.3MnO3 micrometric devices. Nanoconstrictions artificially induced using high resolution e-beam lithography are shown to effectively reduce the DW width leading to strongly enhanced DW resistance. Sharp and large resistance switches result from the appearance and annihilation of the DWs. Room temperature sharp resistance switches, with a MR of 16%, are evidenced in a manganite-based device. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1362646
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  • 7
    Electronic Resource
    Electronic Resource
    Ru doping of the A-type antiferromagnet Pr0.5Sr0.5MnO3: Conversion to a metallic ferromagnet (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 500-503 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The doping of Mn sites of the A-type antiferromagnet Pr0.5Sr0.5MnO3 with ruthenium shows that ferromagnetism and metallicity are induced similarly to the doping of the CE-type phases Ln0.5Ca0.5MnO3. This effect, similar to the Cr doping, differs from the latter by the fact that TC=TIM increases significantly with the Ru level. The different behaviors of Ru and Cr doped Pr0.5Sr0.5MnO3 samples are interpreted on the basis of two factors, ferromagnetic superexchange introduced by the magnetic dopants, and valency effect which contributes to increase the Mn3+ content for Ru(IV) and Ru(V) and does the opposite for Cr(III). © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1320003
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  • 8
    Electronic Resource
    Electronic Resource
    Orbital ordering induced by high impurity levels: Does long-range orbital ordering exist in manganites? (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 4267-4270 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Substitutions at the Mn site by cations M with oxidation states higher than 4+, such as Mo6+ and Ru5+, are shown to stabilize SrMn1−xMxO3 cubic perovskite manganites. This effect is explained by the induced Mn valency shift, which corresponds to electron doping by Mn3+ in the Mn4+ matrix. Interestingly, these electron-doped manganites, characterized by large A-site cationic size, exhibit coupled structural, magnetic, and transport transitions close to or beyond 300 K for M=Ru5+ and M=Mo6+, respectively. These transitions are characteristic of the dz2 orbital ordering generally associated with C-type antiferromagnetism. This result contrasts with the inhomogeneous ferromagnetic metallic state induced by Ru in CaMnO3. The possibility to induce orbital/charge ordering in CaMn1−xMoxO3 or orbital ordering in SrMn1−xMxO3 (M=Ru, Mo) with M contents superior to 10% makes it more difficult to explain based on long-range cooperative Jahn–Teller phenomena in mixed-valency manganites. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1454195
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  • 9
    Electronic Resource
    Electronic Resource
    Rhodium doped manganites: Ferromagnetism and metallicity (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 1297-1302 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is shown that ferromagnetism and insulator to metal transitions in small A site cation manganites Pr1−xCaxMnO3 are induced by rhodium doping. Colossal magnetoresistance properties are evidenced for a large compositional range (0.35≤x〈0.60). The ability of rhodium to induce such properties is compared to the results obtained by chromium and ruthenium doping. Models are proposed to explain this behavior. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1380412
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  • 10
    Electronic Resource
    Electronic Resource
    Probing the underlying charge ordering: Ruthenium-doped Sm1−xSrxMnO3 perovskite manganites (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 2232-2236 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of ruthenium doping upon the appearance of metallicity and ferromagnetism in the series Sm1−xSrxMnO3 is studied and compared with that previously observed for Sm1−xCaxMnO3. It is shown that, in both cases, Ru doping is efficient in the region where charge ordering exists at long or short range, TC increasing significantly with the doping level. In contrast, in the antiferromagnetic electron-rich region of the Sm1−xSrxMnO3 series (x〉0.6), which does not show charge ordering, no ferromagnetism is obtained by Ru doping, though TN is decreased. It is concluded that the huge effect of Ru doping in the appearance of ferromagnetism and metallicity originates from its ability to hinder the underlying charge and orbital ordering, allowing double exchange to be restored. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1342188
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