Dynamics of phase stability and magnetic order in magnetoresistive<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>0.83</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.17</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">Mn</mml:mi></mml:mr

Tkachuk, Andriy V.; Rogacki, K.; Brown, Dennis E.; Dąbrowski, B.; Fedro, A. J.; Kimball, C. W.; Pyles, B.; Xiong, X.; Rosenmann, Daniel; Dunlap, B. D.

doi:10.1103/physrevb.57.8509

Cited by 66 publications

(33 citation statements)

References 27 publications

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“…7 and 9͑d͒. A similar observation in the La-Sr-Mn͑Fe͒-O system was also reported by Tkachuk et al 20 The hyperfine fields above the Curie temperature may be attributed to sample inhomogeneity or to a formation of local ferromagnetic clusters at Fe sites. 20 The spectra of LaMn(Fe)O 3ϩ␦ (ABO 3 ) exhibit the following superparamagnetic characteristics.…”

Section: B Superparamagneticlike Behavior and Cmrsupporting

confidence: 84%

“…The linewidths of LaMn(Fe)O 3ϩ␦ are significantly different from those of LaCa-Mn͑Fe͒-O and La-Sr-Mn͑Fe͒-O in which line broadening of the sextets has been observed with increasing temperatures. 20,21 The broadening was interpreted using a model based either on an antiferromagnetic impurity in a ferromagnetic host 21 or on spin fluctuations. 20 However, the particle sizes of the sample are of the order of micrometers based on observations with optical microscopy.…”

Section: B Superparamagneticlike Behavior and Cmrmentioning

confidence: 99%

“…20,21 The broadening was interpreted using a model based either on an antiferromagnetic impurity in a ferromagnetic host 21 or on spin fluctuations. 20 However, the particle sizes of the sample are of the order of micrometers based on observations with optical microscopy. Further, line broadening is not observed in x-raydiffraction patterns.…”

Section: B Superparamagneticlike Behavior and Cmrmentioning

confidence: 99%

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Magnetoresistance and phase composition of La-Sn-Mn-O systems

Morrish

Jiang

1999

Phys. Rev. B

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The transport properties of the manganites La 1Ϫx Sn x MnO 3ϩ␦ with xϭ0.1-0.5 and of Fe-doped samples have been comprehensively studied using magnetoresistance measurements, 57 Fe and 119 Sn Mössbauer spectroscopy, and x-ray diffraction. At the Sn concentration xϭ0.5, La 0.5 Sn 0.5 MnO 3ϩ␦ , is a single phase. The manganites La 1Ϫx Sn x MnO 3ϩ␦ with xϽ0.5 consist of two phases, ABO 3 and A 2 B 2 O 7 ; the chemical formulas are LaMnO 3ϩ␦ and (La 0.5 Sn 0.5 ) 2 Mn 2 O 7 , respectively. The colossal magnetoresistance ͑CMR͒ in La 1Ϫx Sn x MnO 3ϩ␦ appears to have its origin in deficient La and/or Mn ions in the ABO 3 phase. Mössbauer spectra show that a superparamagnetic doublet exists from Tϭ250-77 K for the ABO 3 phase in the Fe-doped sample and may have superparamagneticlike spin clusters that lead to a low saturation field. Consequently, the CMR reaches 75% at an applied field of only 20 kOe for the Fe-doped sample; however, the same CMR requires fields as high as 70 kOe in the undoped La 0.7 Sn 0.3 MnO 3ϩ␦ sample. ͓S0163-1829͑99͒02437-6͔

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Section: B Superparamagneticlike Behavior and Cmrsupporting

confidence: 84%

Section: B Superparamagneticlike Behavior and Cmrmentioning

confidence: 99%

Section: B Superparamagneticlike Behavior and Cmrmentioning

confidence: 99%

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Magnetoresistance and phase composition of La-Sn-Mn-O systems

Morrish

Jiang

1999

Phys. Rev. B

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“…In order to reveal the mechanism of the magnetotransport, some authors [7][8][9][10][11] have investigated the Fe doping effects on the structural, magnetic and magneto-transport properties of La 1-x Ca x Mn 1-y Fe y O 3 and found that the dopant Fe leads to a weakness of the ferromagnetism at low temperatures and modifies the magnetoresistance effects.…”

Section: Introductionmentioning

confidence: 99%

Fe doping effects on the structural and magnetic properties in Pr _0.5 Sr _0.5 Mn _1−x Fe _x O ₃ with 0 ≤ x ≤ 0.3

Ammar

Zouari

Cheikhrouhou

2004

phys. stat. sol. (c)

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Structural and magnetic properties of Pr 0.5 Sr 0.5 Mn 1-x Fe x O 3 (0.0 ≤ x ≤ 0.3) powder samples have been investigated. Powder X-ray diffraction showed that all our synthesized samples are single phase and crystallize in the orthorhombic symmetry with Imma space group. Fe doping leads to a weakness of the ferromagnetic (FM) ordering at low temperature. With increasing Fe content, the Curie temperature T c decreases.

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“…In this state, the localized charge could distort the lattice, so the increased quadrupole splittings reflected this distortion, where the quadrupole interaction directly reflects local distortion via the electric field gradient tensor. Both JT distortion and local changes in Mn-O-Fe interatomic distances due to charge hopping between Mn 3+ and Mn 4+ with different ionic sizes should give rise to contributions to the quadrupole energy [12].…”

Section: Resultsmentioning

confidence: 98%

Structural, magnetic and electrical transport properties of the La0.70Sr0.30Mn0.96 57Fe0.04O3 + δ perovskite

et al. 2008

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The perovskite La 0.70 Sr 0.30 Mn 0.96 57 Fe 0.04 O 3+δ compound has been investigated. The sample showed orthorhombic structure of Pbmn symmetry. Room temperature (RM) as well as low temperature (77 K) Mössbauer measurements indicate superparamagnetic character. Electrical investigations showed that the sample exhibits semiconductor-metal transition at 180 K. The behavior of the electrical and magnetic properties could be interpreted on the basis of the obtained hyperfine structure of the doped iron rich at 300 and at 77 K.

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Dynamics of phase stability and magnetic order in magnetoresistiveLa0.83Sr0.17Mn

Cited by 66 publications

References 27 publications

Magnetoresistance and phase composition of La-Sn-Mn-O systems

Magnetoresistance and phase composition of La-Sn-Mn-O systems

Fe doping effects on the structural and magnetic properties in Pr _0.5 Sr _0.5 Mn _1−x Fe _x O ₃ with 0 ≤ x ≤ 0.3

Structural, magnetic and electrical transport properties of the La0.70Sr0.30Mn0.96 57Fe0.04O3 + δ perovskite

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Dynamics of phase stability and magnetic order in magnetoresistiveLa0.83Sr0.17Mn

Cited by 66 publications

References 27 publications

Magnetoresistance and phase composition of La-Sn-Mn-O systems

Magnetoresistance and phase composition of La-Sn-Mn-O systems

Fe doping effects on the structural and magnetic properties in Pr 0.5 Sr 0.5 Mn 1−x Fe x O 3 with 0 ≤ x ≤ 0.3

Structural, magnetic and electrical transport properties of the La0.70Sr0.30Mn0.96 57Fe0.04O3 + δ perovskite

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Fe doping effects on the structural and magnetic properties in Pr _0.5 Sr _0.5 Mn _1−x Fe _x O ₃ with 0 ≤ x ≤ 0.3