Electrical current effect in phase-separated La5∕8−yPryCa3∕8MnO3: Charge order melting versus Joule heating

Sacanell, Joaquín; Leyva, A. G.; Lévy, P.

doi:10.1063/1.2136787

Cited by 23 publications

(17 citation statements)

References 29 publications

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“…At each current setting, 20 minutes of data were taken at 45 kSamples/s followed by a 5 nA/s increase in current to the next level. While these applied currents and their driving voltages are well below previously observed cutoff limits said to drive a resistive switch in LPCMO, 37,40 the first observation that we can make from figure 7 is that even modest changes to the applied current can have a dramatic effect on the wire's resistance. We see >85% decrease in resistance when increasing current from 10 nA to 500 nA.…”

Section: Heating Effects On Formation and Stability Of Single Phasmentioning

confidence: 90%

“…Spurred by resistive random access memory applications (RRAM), the manganites have been well studied in regards to E-field induced resistive switching though there is still a great deal of debate as to the precise mechanism 33,[36][37][38][39] . In these studies, the insulating phase melts to the metallic phase under applied voltages with the proposed mechanisms ranging from thermal effects arising from Joule heating, ion migration at the sample interface, or modification of the transport channel through dielectrophoresis.…”

Section: Heating Effects On Formation and Stability Of Single Phasmentioning

confidence: 99%

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Dynamics of a first-order electronic phase transition in manganites

et al. 2011

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By reducing an electronically phase separated manganite (La 1-y Pr y ) x Ca 1-x MnO 3 single crystal thin film to dimensions on the order of the inherent phase domains, it is possible to isolate and monitor the behavior of single domains at a first order transition. At this critical point, it is possible to study the coexistence, formation and annihilation processes of discrete electronic phase domains. With this technique, we make several new observations on the mechanisms leading to the metal insulator transition in manganites. We observe that domain formation is emergent and random, the transition process from the metallic phase to the insulating phase takes longer than the reverse process, electric field effects are more influential in driving a phase transition than current induced electron heating, and single domain transition dynamics can be tuned through careful application of temperature and electric field.

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Section: Heating Effects On Formation and Stability Of Single Phasmentioning

confidence: 90%

Section: Heating Effects On Formation and Stability Of Single Phasmentioning

confidence: 99%

Dynamics of a first-order electronic phase transition in manganites

et al. 2011

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“…[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.…”

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confidence: 99%

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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“…The decrease of resistivity with increasing current at temperature range between the M-I transition and room temperatures is likely related to anomalous thermal effects associated with small heating and cooling steps caused by turning on and off the pulsed dc current source, as discussed recently in Ref. [13]. For more detailed inspection of the current influence upon the resistivity, we have measured the dynamic resistance R d ¼ dV/dI using a lock-in ac technique and plotted the results of a function of the dc current at various temperatures in Fig.…”

Section: Resultsmentioning

confidence: 97%