Persistent magnetoresistive memory in phase separated manganites
We have studied magnetic and transport properties on different manganese-oxide-based compounds exhibiting phase separation: polycrystalline La5/8-yPryCa3/8MnO3 (y = 0.3) and La1/2Ca1/2Mn1-zFezO3 (z = 0.05), and single crystals of La5/8-yPryCa3/8MnO3 (y∼0.35). Time dependent effects indicate that the...
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| Autores principales: | , , , , , , , , , , , , |
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_03048853_v258-259_n_p293_Levy |
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| Sumario: | We have studied magnetic and transport properties on different manganese-oxide-based compounds exhibiting phase separation: polycrystalline La5/8-yPryCa3/8MnO3 (y = 0.3) and La1/2Ca1/2Mn1-zFezO3 (z = 0.05), and single crystals of La5/8-yPryCa3/8MnO3 (y∼0.35). Time dependent effects indicate that the fractions of the coexisting phases are dynamically changing in a definite temperature range. We found that in this range the ferromagnetic fraction "f" can be easily tuned by application of low magnetic fields (<1 T). The effect is persistent after the field is turned off; thus, the field remains imprinted in the actual value of "f" and can be recovered through transport measurements. This effect is due both to the existence of a true phase separated equilibrium state with definite equilibrium fraction "f0", and to the slow growth dynamics. The fact that the same global features were found on different compounds and in polycrystalline and single crystalline samples, suggests that the effect is a general feature of some phase separated media. © 2002 Elsevier Science B.V. All rights reserved. |
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