Fluctuations of the order parameter in R 0.55Sr0.45MnO3 manganites near the metal-insulator phase transition

Bukhanko, F. N.; Bukhanko, A. F.

doi:10.1134/s1063783413060073

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“…The clear singularity observed in the form of an inflection in the concentration depen dence of the electrical resistance R(y) indicates a sharp change in the transport properties of JT polarons in the high temperature phase of the La 1 -y Sm y MnO 3 + δ system, which is induced by strong rotations of MnO 6 octahedra. It can be assumed that the singularity revealed in the dependence R(y) at 300 K is associated with the melting of static correlations of JT polarons (clusters), which are similar to those investigated in our recent work [10] in the high temperature phase similar to the Griffiths phase of the R 0.55 Sr 0.45 MnO 3 manganites in the vicinity of the metal-insulator phase transition. The presence of nanometer scale fluctuations of the charge density in the high temper ature phase similar to the Griffiths phase is usually associated with an inhomogeneity of the spin/charge distribution in the sample.…”

Section: Formation Of 2d Frustrated Antiferromagnetic Phases and A Qumentioning

confidence: 85%

Coexistence of the spin and electron-hole quantum liquids in frustrated manganites La1–y Sm y MnO3+δ

Bukhanko

2015

Phys. Solid State

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The structural, electronic, and magnetic phase transformations induced in the temperature range of 4.2-300 K by the isovalent substitution of the rare earth Sm 3+ ion for the La 3+ ion with a larger radius have been investigated in the system of self doped manganites La 1 -y Sm y MnO 3 + δ (δ ~ 0.1, 0 ≤ y ≤ 1). It has been found using the X ray diffraction analysis that the substitution La Sm is accompanied by a significant increase of the GdFeO 3 type and Jahn-Teller type lattice distortions. At a temperature of 300 K, an increase in the Sm concentration y leads to a concentration phase transition from the pseudocubic O* phase to the orthorhombic O' phase, as well as to the appearance of an s shaped anomaly of the lattice parameter a at con centrations y ≥ 0.4 and an anomalous peak in the concentration dependence of the electrical resistance R(y) near y ≈ 0.85. The magnetic T-y-〈r A 〉 phase diagrams of the La 1 -y Sm y MnO 3 + δ system in the temperature range of 4.2-250 K have been constructed according to the results of measurements of the temperature dependences of the direct current (dc) magnetization M(T). It has been revealed that the samples with y ≥ 0.8 exhibit signs of the melting of the A and CE type modulated antiferromagnetic (AFM) structures in the form of an anomalous decrease both in the critical temperature of the transition to a frustrated AFM state and in the magnetization of the samples with an increase in the concentration y. The anomalies observed in the temperature dependences of the alternating current (ac) dielectric permittivity of the La 1 -y Sm y MnO 3 + δ samples have been explained within the existing concepts of the Bose-Einstein condensation of an electronhole liquid in the form of metallic droplets in an excitonic insulator.

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Section: Formation Of 2d Frustrated Antiferromagnetic Phases and A Qumentioning

confidence: 85%

Coexistence of the spin and electron-hole quantum liquids in frustrated manganites La1–y Sm y MnO3+δ

Bukhanko

2015

Phys. Solid State

Self Cite

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show abstract

Fluctuations of the order parameter in R 0.55Sr0.45MnO3 manganites near the metal-insulator phase transition

Cited by 1 publication

References 24 publications

Coexistence of the spin and electron-hole quantum liquids in frustrated manganites La1–y Sm y MnO3+δ

Coexistence of the spin and electron-hole quantum liquids in frustrated manganites La1–y Sm y MnO3+δ

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