La0.7Ca0.3-xSrxMnO3Manganites: Effect of Structure on the Magnetic and Transport Properties

Ulyanov, A.N.; Maksimov, I.; Nyeanchi, Emmanuel B.; Yu, Seong‐Cho; Medvedev, Yu. V.; Starostyuk, N.Yu.; Sundqvist, Bertil

doi:10.1143/jpsj.71.927

Cited by 6 publications

(3 citation statements)

References 16 publications

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“…A small departure from the ideal dependence can be observed for r A 1.227 Å, which coincides with a structural transition reported for this series. 21 From our data and the data already published we can extend the study of the T c ( r A ) dependence for other manganites and for doping levels y in the 0.15 ≤ y ≤ 0.33 range. The obtained T c (y, r A ) curves, shown in Fig.…”

Section: Resultssupporting

confidence: 67%

“…3 and the fitted parameters T M c (y) and β(y), the pressure sensitivity of T c at low pressures can To guarantee the range of validity of Eq. 2 in order to estimate T c , data points with σ < 3 10 −3 Å2 were extracted from references 9,10,11,15,16,21,22,24,30,31 and from our measurements. The shaded area represents the predictions of the model (Eq.3) taking into account the different values of the fitted parameters (β and T M c ).…”

Section: Resultsmentioning

confidence: 99%

“…4: (Color online)The phase diagram of T1−yDyMnO3 (where T is a trivalent lanthanide as La, Sm, Nd, and D a divalent alkaline earth as Ca, Sr) for 0.15 ≤ y ≤ 0.33 as a function of rA . Data was extracted from references9,21,22,23,24,25 The dashed lines are parabolic fits corresponding to Eq. 1 at constant doping y.…”

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confidence: 99%

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A phenomenological description of the pressure sensitivity of the Curie temperature in hole-doped manganites

Garbarino¹,

Enrique²

2009

Europhys. Lett.

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We performed high pressure experiments on La0.8Ca0.2−xSrxMnO3 (LCSMO)(0 ≤ x ≤ 0.2) ceramic samples in order to analyze the validity of the well known relation between the A mean ionic radius ( rA ) and the Curie temperature Tc of hole-doped manganites at a fixed doping level and for doping values below the 0.3 (Mn +4 /Mn +3 ) ratio. By considering our results and collecting others from the literature, we were able to propose a phenomenological law that considers the systematic dependence of Tc with structural and electronic parameters. This law predicts fairly well the pressure sensitivity of Tc, its dependence with the A-cation radius disorder and its evolution in the high pressure range. Considering a Double Exchange model, modified by polaronic effects, the phenomenological law obtained for Tc can be associated with the product of two terms: the polaronic modified bandwidth and an effective hole doping.

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Section: Resultssupporting

confidence: 67%