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Current driven discontinuous insulator-metal transition and low-field colossal magnetoresistance in Sm0.6Sr0.4MnO3

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2 Author(s)
Rebello, A. ; Department of Physics, NUS Nanoscience and Nanotechnology Initiative (NUSNNI), National University of Singapore, 2 Science Drive 3, Singapore 117542 ; Mahendiran, R.

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We show that with increasing magnitude of current (I), insulator-metal (I-M) transition in Sm0.6Sr0.4MnO3 becomes discontinuous and shifts down in temperature, which is accompanied by an abrupt decrease in temperature of the sample while cooling. The I-M transition exhibits a hysteresis while warming. A magnetic field of μ0H=0.5 T results in -99% magnetoresistance for I=11 mA compared to -32% for I=1 mA. Our results underscore the importance of inhomogeneous Joule heating that leads to coexistence of the high temperature paramagnetic phase with the low temperature ferromagnetic phase over a wide temperature range.

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Applied Physics Letters  (Volume:96 ,  Issue: 15 )