Electric-field switching of orbital order in layered manganites

Hatsuda, K.; Kimura, T.; Tokura, Y.

doi:10.1063/1.1619228

Cited by 27 publications

(24 citation statements)

References 11 publications

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“…However, related behaviour has been reported in thin films of quenched condensed Al [31] and granular films of Cr [32]. One can also note the similarity between these phenomena and the electric-field induced switching of charge ordered-states observed in manganites [44,45,46,47]. In our system, the abrupt increase of the current and of the differential resistance means that several conduction channels open at the same time in the sample, which explains our appellation of "collective Coulomb blockade" for the observed phenomena.…”

Section: (B) a Typical R(h) Measured On Sample D Is Shown R(h) Charmentioning

confidence: 74%

Magnetoresistance and collective Coulomb blockade in superlattices of ferromagnetic CoFe nanoparticles

Tan

Carrey

Desvaux³

et al. 2009

Phys. Rev. B

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Section: (B) a Typical R(h) Measured On Sample D Is Shown R(h) Charmentioning

confidence: 74%

Magnetoresistance and collective Coulomb blockade in superlattices of ferromagnetic CoFe nanoparticles

Tan

Carrey

Desvaux³

et al. 2009

Phys. Rev. B

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“…(ii) An external load resistor in series with the sample is used as a current limiting device 4,[15][16][17] . This arrangement limits the maximum electric field that can be applied across the sample with a power supply of moderate voltage output (˜100V).…”

Section: +mentioning

confidence: 99%

Current-induced metallic behavior inPr0.5Ca0.5MnO3thin films: Competitio

et al. 2004

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Current-induced metallic behavior in Pr 0.5 Ca 0.5 MnO 3 thin films: competition between Joule heating and nonlinear conduction mechanism. substrates. The effects of current-induced metallic-behavior of the films are investigated as a function of the temperature and the magnetic field. Calculations based on a heat transfer model across the substrate, and our resistivity measurements reveal effects of Joule heating on charge transport over certain ranges of temperatures and magnetic fields. Our results also indicate that a nonlinear conduction, which cannot be explained by homogeneous Joule heating of the film, is observed when the material is less resistive (<10 −2 Ω.cm).The origin of this behavior is explained with a model based on local thermal instabilities associated with phase-separation mechanism and a change in the * prellier@ismra.fr 1 long range charge-ordered state.

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“…Different interpretations for these nonlinearities included depinning of CO state, 3 depinning of charge density waves, 4 or change in the orientation of orbital ordering ͑OO͒. 5,6 Indeed, nonlinear effects were subsequently found in materials without CO,7,8 undermining the interpretation of "melting" of CO/OO states.Recent reports tend to interpret the nonlinear I-V characteristics in manganites as the consequence of Joule heating due to large currents. [9][10][11] In the case of resistive curves with a maximum in R͑T͒, current localization on conductive paths and self-heating was suggested to explain the concomitant increase and decrease of resistance with increasing current.…”

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Colossal electroresistance without colossal magnetoresistance in La0.9Sr0.1MnO3

Biškup

Andrés

Nemes

et al. 2007

Applied Physics Letters

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The authors report on colossal electroresistance ͑ER͒ in the ferromagnetic insulator manganite La 0.9 Sr 0.1 MnO 3 . The single crystal samples exhibit a transition into a low resistive state above a certain threshold current. Pulsed measurements demonstrate that this transition is not a consequence of heating. ER behaves similarly to magnetoresistance ͑MR͒ above the orbital order temperature T OO . Below T OO the MR is only 20% while ER enhances the conductivity by several orders of magnitude. Magnetic field and electric current have opposite effects on the conductivity, therefore, it seems that only the injected carriers are able to modify the ordering of e g Mn orbitals. © 2007 American Institute of Physics. ͓DOI: 10.1063/1.2745220͔ Materials and composites based on mixed manganese oxides ͑manganites͒ R 1−x A x MnO 3 ͑R = La, Pr; A = Ca, Sr͒ are prospect candidates for electronic and/or magnetic devices. Their potential for application is based on coupling of charge and spin orders of freedom. The well studied phenomenon in manganites is magnetoresistance ͑MR͒, the magnitude of which ranges from "giant" 10%-20% to colossal 10 8 % in charge ordered Pr 1−x Ca x MnO 3 , x = 0.3-0.5. 1 Recently, a more debated phenomenon is electroresistance ͑ER͒, i.e., nonlinear current-voltage ͑I-V͒ characteristics. Similar to MR, the magnitude of ER varies in different compounds, reaching equally colossal values in Pr 0.7 Ca 0.3 MnO 3 . 2 ER and MR are coupled, i.e., the voltage/current necessary to trigger insulator-metal transition decreases with magnetic field. Since this initial report in 1997, a significant number of publications report nonlinear I-V effects in manganites. Initially, investigations were limited to materials with charge order ͑CO͒ ground state. Different interpretations for these nonlinearities included depinning of CO state, 3 depinning of charge density waves, 4 or change in the orientation of orbital ordering ͑OO͒. 5,6 Indeed, nonlinear effects were subsequently found in materials without CO,7,8 undermining the interpretation of "melting" of CO/OO states.Recent reports tend to interpret the nonlinear I-V characteristics in manganites as the consequence of Joule heating due to large currents. [9][10][11] In the case of resistive curves with a maximum in R͑T͒, current localization on conductive paths and self-heating was suggested to explain the concomitant increase and decrease of resistance with increasing current. 12,13 However, abrupt switches between high and low resistive states are also found in systems where heating cannot explain the increase of resistance with increasing current. 14 To elucidate the relationship of CO/OO order, magnetism, heating, and I-V nonlinearities in manganites, we have studied La 0.9 Sr 0.1 MnO 3 , a system that is a ferromagnetic insulator with charge/orbital ordering. 15 The parent compound LaMnO 3 is a paramagnetic insulator that at T Ͻ 140 K orders antiferromagnetically. By hole doping ͑by divalent ions such as Sr 2+ ͒ it is possible to change the ground state from i...

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Electric-field switching of orbital order in layered manganites

Cited by 27 publications

References 11 publications

Magnetoresistance and collective Coulomb blockade in superlattices of ferromagnetic CoFe nanoparticles

Magnetoresistance and collective Coulomb blockade in superlattices of ferromagnetic CoFe nanoparticles

Current-induced metallic behavior inPr0.5Ca0.5MnO3thin films: Competitio

Colossal electroresistance without colossal magnetoresistance in La0.9Sr0.1MnO3

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