Giant negative magnetoresistance in the vicinity of the ferromagnetic phase transition TC in Sm0.55Sr0.45MnO3

Warczewski, J.; Krok‐Kowalski, J.; Koroleva, L. I.; Gusin, P.; Śliwińska, T.; Mydlarz, T.; Matyjasik, S.; Demin, R. V.; Abramovich, A. I.

doi:10.1016/j.jallcom.2006.09.055

Cited by 3 publications

(8 citation statements)

References 17 publications

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“…This effect consists in the strengthening of the contribution of the antiferromagnetic couplings of the magnetic moments of the Cr 2+ ions and both the Cr 3+ and Cr 4+ ions which can give rise at a certain temperature to the sudden increase of the positive mangnetoresistance. In all the phenomena described above the double exchange magnetic interaction plays the main role [1][2][3][4][5][6][7][8].…”

Section: Discussionmentioning

confidence: 99%

Metamagnetism, giant negative magnetoresistance and spin glass state in the Sm1−xSrxMnO3 (x=0.33, 0.45) and RE0.55Sr0.45MnO3 (RE0.55=Eu0.397Nd0.153, Tb0.25Nd0.30) manganites as well as in the CuCr2X4 (X=S, Se) spinels doped with Sb

Warczewski

Krok‐Kowalski

Gusin

et al. 2008

Journal of Alloys and Compounds

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Section: Discussionmentioning

confidence: 99%

Metamagnetism, giant negative magnetoresistance and spin glass state in the Sm1−xSrxMnO3 (x=0.33, 0.45) and RE0.55Sr0.45MnO3 (RE0.55=Eu0.397Nd0.153, Tb0.25Nd0.30) manganites as well as in the CuCr2X4 (X=S, Se) spinels doped with Sb

Warczewski

Krok‐Kowalski

Gusin

et al. 2008

Journal of Alloys and Compounds

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“…As it is clearly seen in figure 1 all R(T ) curves are symmetrical and of Gaussian-like shape. This effect follows from the fact that our samples were ceramics metals and this type of material allows it to fulfil the Lyapunov theorem i.e., the central theorem of the theory of probability [14]. The analogous curves for single crystals are usually asymmetrical [17].…”

Section: Resistance Magnetoresistance and Other Magnetic Characterismentioning

confidence: 96%

“…The ceramic samples of the compounds under study were prepared by Koroleva et al [11][12][13] and turned out to be perovskites with the orthorhombic Pnma structure (see also [11][12][13][14]). …”

Section: Sample Preparationmentioning

confidence: 99%

“…Also the strength of the external magnetic field plays here a significant role. For instance for the compound Sm 0.55 Sr 0.45 MnO 3 the increase of the external stationary magnetic field results in the significant increase of the absolute value of the magnetoresistance, i.e., from 44% at 0.9 T [4,[11][12][13] up to 100% at 14 T [14].…”

Section: Introductionmentioning

confidence: 99%

“…The data for Sm 0.55 Sr 0.45 MnO 3 are taken from [Magnetoresistance vs. external magnetic induction at 4.2 K for all the four samples under study. The data for Sm 0.55 Sr 0.45 MnO 3 are taken from[14]. Resistance vs. external magnetic induction at 300 K for all the four samples under study.…”

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Correlations of the electrical and magnetic phase transitions in the Sm₁₋_xSr_xMnO₃(x = 0.33, 0.45) and RE_0.55Sr_0.45MnO₃(RE_0.55 = Eu_0.397Nd_0.153, Tb_0.25Nd_0.30) manganites at the high magnetic stationary fields

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MottoThe first address of Satan to the human race began most modestly with the word: why? Adam Mickiewicz (1798-1855)The resistance, magnetoresistance and magnetization measurements have been performed in the temperature range of 4.2-300 K and in the external magnetic inductions up to 14 T for the Sm 1Àx Sr x MnO 3 (x ¼ 0.33, 0.45) and RE 0.55 Sr 0.45 MnO 3 (RE 0.55 ¼ Eu 0.397 Nd 0.153 , Tb 0.25 Nd 0.30 ) manganites. In these samples the metal-semiconductor phase transitions as well as two kinds of the magnetic phase transitions the ferromagnetic-paramagnetic and metamagnetic (both spin-flip and spin-flop) have been observed. It was found that correlations between the magnetic and electrical phase transitions appear at high values of the external magnetic inductions. These correlations consist, simultaneously, of the large negative magnetoresistance and metamagnetic phase transitions. The existence and reconstruction of the ferromagnetic and antiferromagnetic clusters under the influence of the external magnetic induction is considered as a driving force of those correlations.

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Magnetic Double Exchange Interaction as a Driving Force of the Coexistence of the Negative Giant Magnetoresistance and the Spin Glass State in the Selected Re-Manganites and the Spinels with Chromium

Warczewski

Krok‐Kowalski

Gusin

et al. 2008

Molecular Crystals and Liquid Crystals

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In this article is pointed out the particularly important role of the double exchange magnetic interaction in the appearance of the phenomenon of the coexistence of the negative giant magnetoresistance and the spin glass state in the selected RE-manganites and the spinels with chromium. To explain this phenomenon, its statistical background and the types of magnetic interactions in the compounds under study are taken into account. The particular importance of the double exchange magnetic interaction ''cooperating'' with the strong external magnetic induction results here from that: i. its coupling constant is several times greater than the superexchange one, ii. the spin orientation of the hopping electrons is conserved (always ferromagnetic coupling!) and the charge transfer makes the p-type metallic conductance.

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Giant negative magnetoresistance in the vicinity of the ferromagnetic phase transition TC in Sm0.55Sr0.45MnO3

Cited by 3 publications

References 17 publications

Metamagnetism, giant negative magnetoresistance and spin glass state in the Sm1−xSrxMnO3 (x=0.33, 0.45) and RE0.55Sr0.45MnO3 (RE0.55=Eu0.397Nd0.153, Tb0.25Nd0.30) manganites as well as in the CuCr2X4 (X=S, Se) spinels doped with Sb

Metamagnetism, giant negative magnetoresistance and spin glass state in the Sm1−xSrxMnO3 (x=0.33, 0.45) and RE0.55Sr0.45MnO3 (RE0.55=Eu0.397Nd0.153, Tb0.25Nd0.30) manganites as well as in the CuCr2X4 (X=S, Se) spinels doped with Sb

Correlations of the electrical and magnetic phase transitions in the Sm₁₋_xSr_xMnO₃(x = 0.33, 0.45) and RE_0.55Sr_0.45MnO₃(RE_0.55 = Eu_0.397Nd_0.153, Tb_0.25Nd_0.30) manganites at the high magnetic stationary fields

Magnetic Double Exchange Interaction as a Driving Force of the Coexistence of the Negative Giant Magnetoresistance and the Spin Glass State in the Selected Re-Manganites and the Spinels with Chromium

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Giant negative magnetoresistance in the vicinity of the ferromagnetic phase transition TC in Sm0.55Sr0.45MnO3

Cited by 3 publications

References 17 publications

Metamagnetism, giant negative magnetoresistance and spin glass state in the Sm1−xSrxMnO3 (x=0.33, 0.45) and RE0.55Sr0.45MnO3 (RE0.55=Eu0.397Nd0.153, Tb0.25Nd0.30) manganites as well as in the CuCr2X4 (X=S, Se) spinels doped with Sb

Metamagnetism, giant negative magnetoresistance and spin glass state in the Sm1−xSrxMnO3 (x=0.33, 0.45) and RE0.55Sr0.45MnO3 (RE0.55=Eu0.397Nd0.153, Tb0.25Nd0.30) manganites as well as in the CuCr2X4 (X=S, Se) spinels doped with Sb

Correlations of the electrical and magnetic phase transitions in the Sm1−xSrxMnO3(x = 0.33, 0.45) and RE0.55Sr0.45MnO3(RE0.55 = Eu0.397Nd0.153, Tb0.25Nd0.30) manganites at the high magnetic stationary fields

Magnetic Double Exchange Interaction as a Driving Force of the Coexistence of the Negative Giant Magnetoresistance and the Spin Glass State in the Selected Re-Manganites and the Spinels with Chromium

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Correlations of the electrical and magnetic phase transitions in the Sm₁₋_xSr_xMnO₃(x = 0.33, 0.45) and RE_0.55Sr_0.45MnO₃(RE_0.55 = Eu_0.397Nd_0.153, Tb_0.25Nd_0.30) manganites at the high magnetic stationary fields