Resistive relaxation in the field-induced insulator-metal transition of a(La0.4Pr0.6)1.2Sr1.8

Abstract

Resistive relaxation in field-induced insulator-metal transition of a (La 0.4 Pr 0.6 ) We have investigated the resistive relaxation of a (La0.4Pr0.6)1.2Sr1.8Mn2O7 single crystal, in order to examine the slow dynamics of the field-induced insulator to metal transition of bilayered manganites. The temporal profiles observed in remanent resistance follow a stretched exponential function accompanied by a slow relaxation similar to that obtained in magnetization and magnetostriction data. We demonstrate that the remanent relaxation in magnetotransport has a close relationship with magnetic relaxation that can be understood in the framework of an effective medium approximation by assuming that the first order parameter is proportional to the second order one.

Magneto-optical investigation of the field-induced spin-glass-insulator to ferromagnetic-metal transition in the bilayer manganite(La0.4Pr0.6)1.2Cao1, Haraldsen2, Rai3 et al. 2006Phys. Rev. BSelf Cite

“…Recently, Matsukawa et al used combined resistivity, magnetization, and magnetostriction measurements to show that the bulk relaxation time of the lattice is two orders of magnitude smaller than that of the resistivity. 32 Extending this analysis to include microscopic trends, we find that the critical field extracted from field-induced changes in Mn 3+ e g orbital population is similar to the first magnetization boundary (∼2 T). On the other hand, direct measurements of Mn-O and O-Mn-O stretching and bending vibrational modes (Fig.…”

“…28 Evidence for domains in the FMM state also comes from recent resistive relaxation studies. 32 Optical imaging techniques provide direct evidence for texture changes with applied magnetic field as well.…”

“…The results demonstrate that the lattice responds more slowly than charge and spin over various length and time scales. The strong hysteresis in the low temperature physical properties 5,13,29,31,32,51 of (La 0.4 Pr 0.6 ) 1.2 Sr 1.8 Mn 2 O 7 derives from these differences. …”

Creation and annihilation of conducting filaments in mesoscopic manganite structures

“…However, we need to note here that the spontaneous giant resistive jumps and/or slow relaxation have also been observed in bulk samples of manganites with other compositions. 19,20,25,26 The characteristics of these anomalous transport behaviors depend on the sample composition, degree of disorder, ramping speed of external magnetic field, etc. In some of the previous studies, the spontaneous resistive jumps were contributed to the conversion of atomic clusters, which may not form conducting filaments as in our samples.…”

Slight Ti‐Doping‐Induced Strong Time‐Dependent Electrical Transport Behavior in CuCr1−xTixO2

“…The phase separated state usually has its origin in charge ordering (CO), orbital ordering (OO), 27,29,30 or magnetic ordering. 28,30 They believe that the competition among these coexisting phases could lead to metastable states, which are believed to result in the significant RR. For parent CuCrO 2 , it has Cu + Cr 3+ [O 2À ] 2 configuration.…”