Theory for charge and orbital density-wave states in manganite La<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub></mml:math>Sr<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>1.5</mml:mn></mml:mrow></mml:msub></mml:math>MnO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>4</mml:mn></mml:msu

Yao, Zhonghua; Chen, Wei-Qiang; Gao, Jin-Hua; Jiang, Hong-Min; Zhang, Fuchun

doi:10.1103/physrevb.87.155103

Cited by 4 publications

(1 citation statement)

References 31 publications

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“…Furthermore, the creation of lacuna [16] or the insertion of cations such as Bi, Ca and Sr in A or B site of the perovskite separately or simultaneously [17,18] lead to the modification of such physical properties [19] as charge-ordering [20] and orbital density [21]. In general, the valence of Mn ions (Mn 3+ vs. Mn 4+ ) controls the magnetic and electrical behaviour in these compounds.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of La0.5Ca0.5−x□xMnO3 nanocrystalline manganites by sucrose assisted auto combustion route and study of their structural, magnetic and magnetocaloric properties

Moumen

Gagou

Chettab

et al. 2019

J Mater Sci: Mater Electron

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Perovskite manganite La 0.5 Ca 0.5-x □ x MnO 3 (LCMO) nanomaterials were elaborated using the sucrose modified auto combustion method. Rietveld refinements of the X-ray diffraction patterns of the crystalline structure confirm a single-phase orthorhombic state with Pbnm space group (No. 62). The Ca-vacancies were voluntarily created in the LCMO structure in order to study their influence on the magnetic behaviour in the system. The magnetic susceptibility was found to be highly enhanced in the sample with Ca-vacancies.Paramagnetic-to-ferromagnetic phase transition was evidenced in both samples around 254 K.This transition is, characterized by a drastic jump of the susceptibility in the sample with Cavacancies. The maximum of entropy change, observed for both compounds at magnetic field of 6T was 2.30 J kg -1 K -1 and 2.70 J kg -1 K -1 for the parent compound and the lacunar one respectively. The magnetocaloric adiabatic temperature change value calculated by indirect method was 5.6 K and 5.2 K for the non-lacunar and Ca-vacancy compound, respectively.The Ca-lacunar La 0.5 Ca 0.5-x □ x MnO 3 (x=0.05) reported in this work demonstrated overall enhancement of the magnetocaloric effect over the LCMO. The technique used to elaborate LCMO materials was beneficial to enhance the magnetocaloric effect and magnetic behaviour. Therefore, we conclude that this less costly environmentally friendly system can be considered as more advantageous candidate for magnetic refrigeration applications then the commonly Gd-based compounds.

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Section: Introductionmentioning

confidence: 99%

Synthesis of La0.5Ca0.5−x□xMnO3 nanocrystalline manganites by sucrose assisted auto combustion route and study of their structural, magnetic and magnetocaloric properties

Moumen

Gagou

Chettab

et al. 2019

J Mater Sci: Mater Electron

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Electronic correlation effects and orbital density wave in the layered compound 1T-TaS2

Liu

Quan

et al. 2017

Phys. Rev. B

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Orbital ordering transition in the single-layer manganites near half doping: a weak-coupling approach

Singh

2015

Eur. Phys. J. B

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The roles of crystal-field splitting and Jahn-Teller distortions on the orbital ordering transition are investigated in the single-layer manganites near half doping.Crystal-field splitting of energy levels favoring the d 3z 2 −r 2 occupancy provides not only the correct Fermi surface topology for La 0.5 Sr 1.5 MnO 4 having a circular electron pocket around the Γ point, but also enhances the flatness of the hole pocket around the M point thereby improving the nesting. In the presence of the circular electron pocket, Jahn-Teller distortions are found to be crucial for the transition to the transverse orbital ordering with ordering wavevector (0.5π, 0.5π). In the hole-doping regime 0.5 ≤ x ≤ 0.7, the orbital ordering wavevector shows a linear dependence on the hole concentration in accordance with the experiments.

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Theory for charge and orbital density-wave states in manganite La0.5Sr1.5MnO4

Cited by 4 publications

References 31 publications

Synthesis of La0.5Ca0.5−x□xMnO3 nanocrystalline manganites by sucrose assisted auto combustion route and study of their structural, magnetic and magnetocaloric properties

Synthesis of La0.5Ca0.5−x□xMnO3 nanocrystalline manganites by sucrose assisted auto combustion route and study of their structural, magnetic and magnetocaloric properties

Electronic correlation effects and orbital density wave in the layered compound 1T-TaS2

Orbital ordering transition in the single-layer manganites near half doping: a weak-coupling approach

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