Transport and magnetic properties of $Nd_{1- x}Pb_xMnO_3$ single crystals

Ghosh, Nilotpal and Elizabeth, Suja and Bhat, HL and Paulose, PL (2004) Transport and magnetic properties of $Nd_{1- x}Pb_xMnO_3$ single crystals. In: Journal of Applied Physics, 96 (6). pp. 3343-3347.

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Abstract

Transport and magnetic properties of flux-grown $Nd_{1-x}Pb_xMnO_3$ single crystals (x-0.15–0.5) are studied in the temperature range 300–77 K and 280–2 K, respectively. Magnetization measurements with a superconducting quantum interference device confirm a paramagnetic to ferromagnetic transition around 110, 121, 150, 160, and 178 K for x-0.15, 0.2, 0.3, 0.4, and 0.5, respectively. Four probe resistivity measurements at low temperatures show a monotonic increase for x-0.15 which represents a ferromagnetic insulating (FMI) phase. For $Nd_{0.8}Pb_{0.2}MnO_3$ there is a slope change present in the resistivity profile at 127 K where metal to insulator transition (MI) sets in. For x-0.3 this MI transition is more prominent. However, both these samples have FMI phase at low temperature. When the concentration of lead increases $(x>0.3)$ the sample displays a clear insulator to metal transition with a low temperature ferromagnetic metallic phase. On the basis of these measurements we have predicted the phase diagram of $Nd_{1-x}Pb_xMnO_3.$ Magnetization measurements by a vibration sample magnetometer point out the appreciable differences between zero field cooled and field cooled profiles below the ferromagnetic to paramagnetic transition temperature for all x. These are indicative of magnetic frustration.

Item Type:	Journal Article
Publication:	Journal of Applied Physics
Publisher:	American Institute of Physics
Additional Information:	The copyright of this article belongs to American Institute of Physics.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	13 Apr 2006
Last Modified:	19 Sep 2010 04:25
URI:	http://eprints.iisc.ac.in/id/eprint/6268

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