Meena, R. S. and Singh, Shiva Kumar and Pal, Anand and Kumar, Anuj and Jha, R. and Rao, K. V. R. and Du, Y. and Wang, X. L. and Awana, V. P. S. (2012) High field (14 T) magneto transport of Sm/PrFeAsO. Journal of Applied Physics , 111 (7). 07E323-07E326. ISSN 0021-8979

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Abstract

We report high field magneto transport of Sm/PrFeAsO. Below spin density wave transition (T-SDW), the magneto-resistance (MR) of Sm/PrFeAsO is positive and increasing with decreasing temperature. The MR of SmFeAsO is found to be 16%, whereas it is 21.5% in the case of PrFeAsO, at 2.5 K under applied magnetic field of 14 Tesla (T). In the case of SmFeAsO, the variation of isothermal MR with field below 20 K is nonlinear at lower magnetic fields (<2 T) and it is linear at moderately higher magnetic fields (H >= 3.5 T). On the other hand, PrFeAsO shows almost linear MR at all temperatures below 20 K. The anomalous behavior of MR being exhibited in PrFeAsO is originated from Dirac cone states. The stronger interplay of Fe and Pr ordered moments is responsible for this distinct behavior. PrFeAsO also shows a hump in resistivity (R-T) with a possible conduction band (FeAs) mediated ordering of Pr moments at around 12 K. However, the same is absent in SmFeAsO even down to 2 K. Our results of high field magneto-transport of up to 14 T brings about clear distinction between ground states of SmFeAsO and PrFeAsO.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s American Institute of Physics.
Subjects:	Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	12 Mar 2020 11:10
Last Modified:	12 Mar 2020 11:10
URI:	http://npl.csircentral.net/id/eprint/3548

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