EPR linewidths in<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>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ca</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">MnO</mml:mi></mml:mrow><mml:mrow><mml:mn>

Hùber, D. L.; Alejandro, G.; Caneiro, A.; Causa, M.T.; Prado, F.; Tovar, M.; Oseroff, S. B.

doi:10.1103/physrevb.60.12155

Cited by 169 publications

(126 citation statements)

References 33 publications

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“…Estimated DM parameters are presented in table 2. The absolute value of the DM vector for Mn-O-Mn along the c-axis is about 0.069 meV, which is in good agreement with experimental value of 0.086 meV from the ESR measurement [33]. The ratio of D/J = 0.049 along the c-axis is also reasonable in view of the experimental value of D/J ∼ 0.045, which is estimated from the weak ferromagnetic moment of 0.18µ B /Mn in the A-type LaMnO 3 [34].…”

supporting

confidence: 77%

Effect of orbital symmetry on the anisotropic superexchange interaction

Kim

Min²

2011

New J. Phys.

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supporting

confidence: 77%

Effect of orbital symmetry on the anisotropic superexchange interaction

Kim

Min²

2011

New J. Phys.

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“…As shown in figure 5 the behaviour is quite different. For x = 0, T N is much lower than Θ due to the competition between first and second neighbour interactions [19]. For low doping, T mo is slightly depressed with x while the AFM-like Θ tends rapidly to zero, becomes FM-like, and reaches Θ = 180 K for x = 0.25.…”

Section: +mentioning

confidence: 99%

High temperature susceptibility in electron doped Ca_1 xY_xMnO₃: double exchange versus superexchange

Aliaga

Causa

Tovar

et al. 2002

J. Phys.: Condens. Matter

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Abstract. We present a study of the magnetic properties of the electron doped manganites Ca 1-x Y x MnO 3 (for 0 ≤ x ≤ 0.25) in the paramagnetic regime. For the less doped samples (x ≤ 0.1) the magnetic susceptibility, χ(T), follows a Curie-Weiss (CW) law only for T > 450 K and, below this temperature, χ -1 (T) shows a ferrimagnetic-like curvature. We approached the discussion of these results in terms of a simple mean-field model where double exchange, approximated by a ferromagnetic Heisenberg-like interaction between Mn 3+ and Mn 4+ ions, competes with classical superexchange. For higher levels of doping (x ≥ 0.15), the CW behaviour is observed down to the magnetic ordering temperature (T mo ) and a better description of χ(T) was obtained by assuming full delocalization of the e g electrons. In order to explore the degree of delocalization as a function of T and x, we analyzed the problem through Montecarlo simulations. Within this picture we found that at high T the electrons doped are completely delocalized but, when T mo is approached, they form magnetic polarons of large spin that cause the observed curvature in χ -1 (T) for x ≤ 0. IntroductionManganites, responding to the formula B 1-x A x MnO 3 (with B = divalent alkaline earth and A = trivalent rare earth), have prompted a burst of research activity in the last decade, as they enclosed not only very rich physics but also interest in technological applications. The dynamics of these systems is mainly governed by the Mn ions, whose average valence changes with x between 4+ and 3+. The Mn 4+ ions have noncompensated spins in t 2g 3 configuration that give rise to localized S = 3/2 spins. On the other hand, the Mn 3+ ions have an extra e g electron (with s = ½), that couples ferromagnetically (FM) to the t 2g spins. The e g electrons tend to be itinerant and lower their kinetic energy by polarizing with FM character the localized t 2g spins. This process is known [1] as double exchange (DE) and in these materials competes with the classical superexchange (SE) interaction between Mn ions.In Ca 1-x La x MnO 3 were the whole series, from x = 0 to x = 1, can be obtained with the perovskite structure, the behaviour in the electron and hole doping regions were found different. The parent compounds are indeed quite different: while LaMnO 3 , a Jahn-Teller system, displays A-type [2] antiferromagnetism, where ferromagnetic (FM) planes order antiferromagnetically (AFM), the non Jahn-Teller CaMnO 3 is a G-type antiferromagnet, where each magnetic moment orders AFM with his nearest neighbours [2]. Most studies have been performed on hole doped compounds where ferromagnetism and colossal magnetoresistance (CMR) were found. In the range of electron doping, transport and magnetization studies on Ca 1-x La x MnO 3 showed that a complete FM state is never reached and different models were discussed in order to explain the magnetic properties at low temperatures [3,4]. These studies showed that in this region of doping new and very interesting phenomena appear as a conseq...

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“…whereJ D = J 2 leg + 2J 2 rung mean an average exchange integral, 30 and angular dependence is determined by the transformation for DM vector…”

Section: 30mentioning

confidence: 99%

ESR study of the spin ladder with uniform Dzyaloshinskii-Moriya interaction

et al. 2015

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Evolution of the ESR absorption in a strong-leg spin ladder magnet (C7H10N2)2CuBr4 (abbreviated as DIMPY) is studied from 300 K to 400 mK. Temperature dependence of the ESR relaxation follows a staircase of crossovers between different relaxation regimes. We ague that the main mechanism of ESR line broadening in DIMPY is uniform Dzyaloshinskii-Moria interaction (|D| = 0.20 K) with an effective longitudinal component along an exchange bond of Cu ions within the legs resulting from the low crystal symmetry of DIMPY and nontrivial orbital ordering. The same DzyaloshinskiiMoriya interaction results in the lifting of the triplet excitation degeneracy, revealed through the weak splitting of the ESR absorption at low temperatures.

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EPR linewidths inLa1−xCaxMnO

Cited by 169 publications

References 33 publications

Effect of orbital symmetry on the anisotropic superexchange interaction

Effect of orbital symmetry on the anisotropic superexchange interaction

High temperature susceptibility in electron doped Ca_1 xY_xMnO₃: double exchange versus superexchange

ESR study of the spin ladder with uniform Dzyaloshinskii-Moriya interaction

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EPR linewidths inLa1−xCaxMnO

Cited by 169 publications

References 33 publications

Effect of orbital symmetry on the anisotropic superexchange interaction

Effect of orbital symmetry on the anisotropic superexchange interaction

High temperature susceptibility in electron doped Ca1 xYxMnO3: double exchange versus superexchange

ESR study of the spin ladder with uniform Dzyaloshinskii-Moriya interaction

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Product

Resources

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High temperature susceptibility in electron doped Ca_1 xY_xMnO₃: double exchange versus superexchange