Charge Ordering and Sound Velocity Anomaly in La1-XSrXMnO3(X≥0.5)

Fujishiro, Hiroyuki; Fukase, Tetsuo; Ikebe, Manabu

doi:10.1143/jpsj.67.2582

Cited by 90 publications

(47 citation statements)

References 22 publications

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“…Although a wide interval of magnitudes was allowed for the sound velocity ph ͑confined in the interval of 1000-5000 m/s͒ and the Debye temperature ͑350-450 K͒, the final values of these parameters are surprisingly close to each other and are in good agreement with literature data. 26,27 The mean free paths of the phonons scattered by grain boundaries ͑⌳ b ͒ were determined from b and ph ͑⌳ b = b ph ͒ and are listed in Table II. Although all samples are characterized by similar average grain sizes ͑1-10 m͒, the ⌳ b values are found to decrease with increasing Mn 3 O 4 content.…”

Section: Interpretation Of Resultsmentioning

confidence: 99%

Influence of microstructure on the thermal conductivity of magnetoresistive La0.7Ca0.3MnO3/Mn3O4 manganite/insulating oxide polycrystalline bulk composites

Mucha

Vertruyen

Misiorek

et al. 2009

Journal of Applied Physics

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We report the temperature dependence of the thermal conductivity ͑T͒ of bulk polycrystalline composite samples containing a magnetoresistive manganite ͑La 0.7 Ca 0.3 MnO 3 ͒ and an electrically insulating phase ͑Mn 3 O 4 ͒. The sample porosity is shown to be a significant parameter affecting the experimental data: after porosity correction the curves display the characteristics of an ideal composite. A fit of the ͑T͒ curves at low temperature using the Debye model enables the mean free path of phonons scattered on "boundaries" to be determined. The values are on the order of the grain size but are influenced by the grain arrangement and the presence of twins.

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Section: Interpretation Of Resultsmentioning

confidence: 99%

Influence of microstructure on the thermal conductivity of magnetoresistive La0.7Ca0.3MnO3/Mn3O4 manganite/insulating oxide polycrystalline bulk composites

Mucha

Vertruyen

Misiorek

et al. 2009

Journal of Applied Physics

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“…Fujishiro et al [28], is made. In La 1−x Sr x MnO 3 , the transition between the ferromag- netic insulating phase and the ferromagnetic metallic phase occurs at x=0.18, simultaneously with the orthorhombic/rhombohedral phase transition.…”

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High-Temperature Magnetic Insulating Phase in UltrathinLa0.67Sr0.33MnO3Films

et al. 2012

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“…Single crystals [9] become FM metals for x = 0.5 and AFM metals for x ≥ 0.54. A study using polycrystals has suggested a signature of charge ordering for x ∼ 0.5 from the measurements of the sound velocity [10]. Another polycrystal study has suggested that FM and AFM domains coexist with an anomaly due to charge ordering [11].…”

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Chemical potential shift in La_{1 − x}Sr_xMnO₃: Photoemission test of the phase separation scenario

et al. 2002

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Abstract. -We have studied the chemical potential shift in La1−xSrxMnO3 as a function of doped hole concentration by core-level x-ray photoemission. The shift is monotonous, which means that there is no electronic phase separation on a macroscopic scale, whereas it is consistent with the nano-meter scale cluster formation induced by chemical disorder. Comparison of the observed shift with the shift deduced from the electronic specific heat indicates that hole doping in La1−xSrxMnO3 is well described by the rigid-band picture. In particular no mass enhancement toward the metal-insulator boundary was implied by the chemical potential shift, consistent with the electronic specific heat data.It is generally recognized that the manganites R 1−x A x MnO 3 with the perovskite structure, where R is a rare-earth (R = La, Pr, Nd) and A an alkaline-earth metal (A = Sr, Ba, Ca), exhibit a very rich phase diagram because of competition between the ordering and fluctuations of the spin, lattice and charge degrees of freedom [1]. They are antiferromagnetic (AFM) insulators for undoped materials (x = 0) while hole doping produces a ferromagnetic (FM) metallic phase, which shows colossal magnetoresistance (CMR). Historically, the ferromagnetism in this phase has been explained by double exchange mechanism [2]. Materials with x close to 0.5 have been the focus of recent studies because most of the manganites show so-called CE-type antiferromagnetic charge-and orbital-ordered insulating state at x = 0.5. When this spin-charge-orbital ordering completes with metallic behavior, they also exhibit a remarkable CMR effect, which becomes the subject of intensive studies. The origin of the CMR behaviors has been debated for many years since it was pointed out that double exchange interaction alone is insufficient to explain the large resistivity change [3].Recently, the possibility of phase separation as the origin of the CMR is discussed by theoretical studies. Moreo et al. [4] has pointed out the possibility of the coexistence of the antiferromagnetic or ferromagnetic insulating phase and the ferromagnetic metallic phase c EDP Sciences

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Charge Ordering and Sound Velocity Anomaly in La_1-XSr_XMnO₃(X≥0.5)

Cited by 90 publications

References 22 publications

Influence of microstructure on the thermal conductivity of magnetoresistive La0.7Ca0.3MnO3/Mn3O4 manganite/insulating oxide polycrystalline bulk composites

Influence of microstructure on the thermal conductivity of magnetoresistive La0.7Ca0.3MnO3/Mn3O4 manganite/insulating oxide polycrystalline bulk composites

High-Temperature Magnetic Insulating Phase in UltrathinLa0.67Sr0.33MnO3Films

Chemical potential shift in La_{1 − x}Sr_xMnO₃: Photoemission test of the phase separation scenario

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Charge Ordering and Sound Velocity Anomaly in La1-XSrXMnO3(X≥0.5)

Cited by 90 publications

References 22 publications

Influence of microstructure on the thermal conductivity of magnetoresistive La0.7Ca0.3MnO3/Mn3O4 manganite/insulating oxide polycrystalline bulk composites

Influence of microstructure on the thermal conductivity of magnetoresistive La0.7Ca0.3MnO3/Mn3O4 manganite/insulating oxide polycrystalline bulk composites

High-Temperature Magnetic Insulating Phase in UltrathinLa0.67Sr0.33MnO3Films

Chemical potential shift in La1 − xSrxMnO3: Photoemission test of the phase separation scenario

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Charge Ordering and Sound Velocity Anomaly in La_1-XSr_XMnO₃(X≥0.5)

Chemical potential shift in La_{1 − x}Sr_xMnO₃: Photoemission test of the phase separation scenario