Thermal History Dependent Electronic Transport and Magnetic Properties in Bulk La1/3Nd1/3Ca1/3MnO3

Sun, Jia‐Tao; Rao, Guanghui; Liang, Jiayuan

doi:10.1002/1521-396x(199709)163:1<141::aid-pssa141>3.0.co;2-c

Cited by 6 publications

(1 citation statement)

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“…The coexistence of more than one phase of different character and their competitive instability are believed to be the origin of the extremely large MR effects 16 and the amazing thermal and magnetic history dependent behaviors observed. 17 Unfortunately, this kind of phase separation did not receive deserved attention until the work by Uehara et al 18 for a similar system La 0.625Ϫx Pr x Ca 0.375 MnO 3 .…”

Section: Introductionmentioning

confidence: 99%

Doping effects on the phase separation in perovskiteLa0.67−xBixCa<

et al. 2003

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Effects of Bi, Cr, and Fe doping on phase separation of La 0.67 Ca 0.33 MnO 3 have been experimentally studied. As proved by the electron-spin resonance and neutron-diffraction studies, partial replacement of La by Bi causes the simultaneous occurrence of ferromagnetic ͑FM͒ phase and charge-ordered antiferromagnetic phase. As a consequence, two subsequent magnetic transitions at ϳ120 K and ϳ230 K are resulted. A strong coupling between the coexisted phases is assumed, which is responsible for the insensitivity of T c (L), the higher Curie temperature, to Bi doping after the appearance of phase separation, and consistent with the discontinuous variation of T c (L) with Cr doping. As expected, the substitution of Cr for Mn in this case promotes the FM order, but its effects are significantly different for the two magnetic states. Each Cr drives ϳ100 neighboring unit cells, for the high-moment state, and ϳ60 unit cells, for the low-moment state, into the FM state. Two definite processes can be identified for the melting of the charge-ordered phase. The FM fraction increases rapidly in the initial stage of Cr doping, and then slowly when the FM population exceeds ϳ90%. This could be a common feature of the phase-separated system suffering from random-phase fluctuation according to a theoretical analysis. Exactly opposite effects on phase constituent are produced by Cr doping and Bi doping, and 1% Cr are equivalent to ϳ4.6% Bi. In contrast, both Cr doping and magnetic field promote the FM order. 1% Cr correspond to a field of ϳ4.5 T for the low-moment state and 6 T for the high-moment state, reducing the energy difference between the charge ordering and the FM states by ϳ0.96 meV/Mn and ϳ1.3 meV/Mn, respectively.

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Section: Introductionmentioning

confidence: 99%