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Lattice coupled first order magnetoresistance transition in an A-type antiferromagnet: Pr$_{0.46}$Sr$_{0.54}$MnO$_3$

R. Mahendiran·C. Martin·A. Maignan·M. Hervieu·B. Raveau·L. Morellon·C. Marquina·B. Garcia-Landa·M. R. Ibarra
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Abstract

We investigated magnetic, magnetotransport and magnetostriction properties of the A-type antiferromagnet Pr$_{0.46}$Sr$_{0.54}$MnO$_3$ which undergoes a first order paramagnetic-antiferromagnetic transition below T$_N$ = 210 K while cooling and T$_N$ = 215 K while warming. The zero field ($μ_0$H = 0 T) resistivity shows a sudden jump at T$_N$ and a small bump around T$_{max}$ = 220 K (\TEXTsymbol{>} T$_N$). T$_N$ shifts down and T$_{max}$ shifts up with increasing $μ_0$H. Magnetoresistance as high as -45-57 % at 7 T is found in the temperature range 180 K-230 K. Isothermal measurements indicate that the field induced antiferromagnetic to ferromagnetic transition below T$_N$ is accompanied by a rapid decrease of the resistivity but increase of volume ($Δ$V/V = +0.25 % at 180 K and 13.7 T). This lattice coupled magnetoresistance transition is suggested due to the field induced structural transition from the low volume orthorhombic to the high volume tetragonal structure.

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R. Mahendiran, C. Martin, A. Maignan, M. Hervieu, B. Raveau, L. Morellon, C. Marquina, B. Garcia-Landa, M. R. Ibarra. 2001-07-27. Lattice coupled first order magnetoresistance transition in an A-type antiferromagnet: Pr$_{0.46}$Sr$_{0.54}$MnO$_3$. https://arxiv.org/abs/cond-mat/0107560

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