Distinct origins of magnetic -field -induced resistivity irreversibility in two manganites with similar ground states : Pr$_{0.5}$Sr$_{0.41}$Ca$_{0.09}$MnO$_{3}$ and La$_{0.5}$Ca$_{0.5}$MnO$_{3}$

Details Distinct origins of magnetic -field -induced resistivity irreversibility in two manganites with similar ground states : Pr$_{0.5}$Sr$_{0.41}$Ca$_{0.09}$MnO$_{3}$ and La$_{0.5}$Ca$_{0.5}$MnO$_{3}$ Distinct origins of magnetic -field -induced resistivity irreversibility in two manganites with similar ground states : Pr$_{0.5}$Sr$_{0.41}$Ca$_{0.09}$MnO$_{3}$ and La$_{0.5}$Ca$_{0.5}$MnO$_{3}$

2001-07-21

arxiv.org/abs/cond-mat/0107448v1

Physics

Condensed Matter

Materials Science

17 pages, 5 JPEG figures. submitted to Phys. Rev. B

Scientific paper

Our investigation of the magnetotransport in two charge ordered manganites with similar magnetic ground states reveals that the origin of magnetoresistance can not be concluded from the isofield resistivity, $\rho $(T, constant H), measurements alone. Both Pr$_{0.5}$Sr$_{0.41}$Ca$_{0.09}$MnO$_{3}$ (PrSrCa) and La$_{0.5}$Ca$_{0.5}$MnO$_{3}$ (LaCa) show a ferromagnetic transition (T$_{C}$ = 260 K for PrSrCa, 230 K for LaCa) followed by an antiferromagnetic transition (T$_{N}$ = 170 K for PrSrCa, 140 K for LaCa). These compounds show qualitatively similar magnetotransport : Below the irreversibility temperature T$_{IR}$, field cooled (FC) resistivity is lower than zero field cooled (ZFC) and decreases continuously with T, whereas the ZFC $\rho $(T, H) resembles $\ $the behavior of $\rho $(T, H = 0 T). The value of $\rho $(ZFC)/$\rho $(FC) is $\approx $ 10$^{4}$ at 5 K and $\mu_{0}$H = 7 T in both compounds. However, isothermal magnetic measurements suggest distinct origins of magnetoresistance : Field cooling enhances ferromagnetic phase fraction in LaCa whereas it drives PrSrCa into a metastable state with high magnetization. The distinct origins of magnetotransport is also reflected in other magnetic history dependent properties.

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