Kumar, Anuj and Kumar, Shiva and Mudgel, Monika and Kishan, H. and Awana, V. P. S. (2008) Multiple Magnetic Ordering Temperatures in RuSr2Eu1.5Ce0.5Cu2O10−δ System. Journal of Superconductivity and Novel Magnetism, 21 (4). pp. 259-264. ISSN 1557-1947

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Abstract

We report synthesis and magnetic characterization of variously processed magneto-superconducting (Rutheno-cuprates) RuSr2Eu1.5Ce0.5Cu2O10−δ . The compound crystallizes in I4/mmm tetragonal structure. Magnetization measurements showed bulk magnetic ordering and superconductivity at around 100 K and 30 K, respectively. Further, the careful examination of the low field magnetic susceptibility reveals two minor magnetic transitions at around 135 K and 200 K, in addition to the major transition at 100 K. When the samples are processed in different environments of air, O2 and slightly pressurized O2, the nature of magnetic transitions and the superconductivity changes dramatically. The highest superconducting transition is achieved for the high pressure O2 annealed samples and the lowest for the air annealed one. On the other hand, the minor magnetic transitions are more prominent in air-annealed samples. Though the minor magnetic transitions are intrinsic to all variously processed samples, they are not clearly seen for higher O2 content samples. Basically, the Ru spins order antiferro magnetically at around 200 K (first minor transition), and reorients themselves at 125 K (second minor transition) before finally ordering in canted ferromagnetic state or a spin glass structure. These results can be explained on the basis of fluctuating valance of Ru4+/Ru5+.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Springer Verlag.
Subjects:	Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	20 Apr 2015 07:17
Last Modified:	20 Apr 2015 07:17
URI:	http://npl.csircentral.net/id/eprint/1106

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