Pairing of charge-ordered stripes in (La,Ca)MnO3

Mori, Shigeo; Chen, C. H.; Cheong, S.-W.

doi:10.1038/33105

Cited by 651 publications

(528 citation statements)

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“…1c). In the HT phase, it shows weak Pauli paramagnetism, which is well explained by the non-magnetic Ir 3 þ (5d 6 ) with the t 2g band full and Te 2 3 À with 5p conduction electrons (one hole per formula unit). On cooling across T C 1 , it drops to be negative and the intermediate phase is diamagnetic.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, a charge modulation can be induced by electronic Peierls instability, the so called charge density wave (CDW) 4,5 . As electron states are localized as in the Mott states, it appears as a charge order-type modulation due to intersite Coulomb interactions [6][7][8] . In a system with heavy elements, the large SOC can stabilize the localized spin-orbit Mott state as observed in iridates 9 , and then the charge-ordered Mott state naturally leads a novel electronic framework of the interplay.…”

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Charge-ordering cascade with spin–orbit Mott dimer states in metallic iridium ditelluride

Lee

Kim

et al. 2015

Nat Commun

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Spin-orbit coupling results in technologically-crucial phenomena underlying magnetic devices like magnetic memories and energy-efficient motors. In heavy element materials, the strength of spin-orbit coupling becomes large to affect the overall electronic nature and induces novel states such as topological insulators and spin-orbit-integrated Mott states. Here we report an unprecedented charge-ordering cascade in IrTe 2 without the loss of metallicity, which involves localized spin-orbit Mott states with diamagnetic Ir 4 þ -Ir 4 þ dimers. The cascade in cooling, uncompensated in heating, consists of first order-type consecutive transitions from a pure Ir 3 þ phase to Ir 3 þ -Ir 4 þ charge-ordered phases, which originate from Ir 5d to Te 5p charge transfer involving anionic polymeric bond breaking. Considering that the system exhibits superconductivity with suppression of the charge order by doping, analogously to cuprates, these results provide a new electronic paradigm of localized charge-ordered states interacting with itinerant electrons through large spin-orbit coupling.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Charge-ordering cascade with spin–orbit Mott dimer states in metallic iridium ditelluride

Lee

Kim

et al. 2015

Nat Commun

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Section: Pacs Numbersmentioning

confidence: 99%

“…Well defined anomalies of physical properties at commensurate carrier concentrations of x=N/8 (where N=1, 3, 4, 5, and 7) and x = L/3 (where L=1,2) were unambiguously established. Of particular interest is the phenomenon of charge and orbital ordering, most clearly pronounced for x=1/2 [4,5,6,7,8,9,10].In this communication we report the results of an infrared reflection study of La 1/2 Ca 1/2 MnO 3 over broad frequency range and at temperatures, covering the transitions from the high temperature paramagnetic to ferromagnetic and, upon further cooling, to antiferromagnetic phase. By making use of Kramers-Kronig analysis we obtained the spectral dependence of conductivity.…”

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confidence: 99%

Charge and lattice dynamics of ordered state in La1/2Ca1/2MnO3: infrared reflection spectroscopy study

Litvinchuk¹,

Iliev²,

Pissas³

et al. 2004

Solid State Communications

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We report an infrared reflection spectroscopy study of La 1/2 Ca 1/2 MnO3 over a broad frequency range and temperature interval which covers the transitions from the high temperature paramagnetic to ferromagnetic and, upon further cooling, to antiferromagnetic phase. The structural phase transition, accompanied by a ferromagnetic ordering at TC =234 K, leads to enrichment of the phonon spectrum. A charge ordered antiferromagnetic insulating ground state develops below the Néel transition temperature TN =163 K. This is evidenced by the formation of charge density waves and opening of a gap with the magnitude of 2∆0 = (320 ± 15) cm −1 in the excitation spectrum. Several of the infrared active phonons are found to exhibit anomalous frequency softening. The experimental data suggest coexistence of ferromagnetic and antiferromangetic phases at low temperatures. PACS numbers:Manganite perovskites R 1−x A x MnO 3 (where R is a trivalent rare earth and A is a divalent alkaline rare earth) exhibit rich phase diagram and a variety of intriguing properties due the delicate interplay of spin, charge, lattice, and orbital degrees of freedom (Ref. [1,2,3] and references cited therein). Well defined anomalies of physical properties at commensurate carrier concentrations of x=N/8 (where N=1, 3, 4, 5, and 7) and x = L/3 (where L=1,2) were unambiguously established. Of particular interest is the phenomenon of charge and orbital ordering, most clearly pronounced for x=1/2 [4,5,6,7,8,9,10].In this communication we report the results of an infrared reflection study of La 1/2 Ca 1/2 MnO 3 over broad frequency range and at temperatures, covering the transitions from the high temperature paramagnetic to ferromagnetic and, upon further cooling, to antiferromagnetic phase. By making use of Kramers-Kronig analysis we obtained the spectral dependence of conductivity. Its analysis yields information on the evolution of phonons and electronic excitations as a function of temperature. We found that additional phonon modes appear in the spectra in the ferromagnetic phase, a fact which implies the occurrence of a structural phase transition. Upon further cooling the conductivity spectrum shows development of a gap, which signals the formation of a charge ordered state at low temperatures. At the same time a Drude-like component of the conductivity does not vanish completely and suggests the coexistence of a metallic and insulating phases.The measurements were performed on a dense ceramic pellet of La 1/2 Ca 1/2 MnO 3 , mechanically polished to optical quality. The material preparation technique is described in Ref. [3,9,11]. The samples were intensively characterized by the X-ray scattering, neutron diffraction, magnetization measurements, Raman scattering as well as Mössbauer spectroscopy (doped with 1% Sn or Fe). These measurements unambiguously identified the transition from the paramagnetic to ferromagnetic phase at T C =234 K, and further to antiferromagnetic phase at T c N =163 K (cooling cycle) or T h N =196 K (heating cycle), see The re...

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“…The CE phase at x=0.5 has equal amount of Mn 3+ /Mn 4+ aligned in a checkerboard pattern in x-y plane ( Fig.1(a)), with charges stacked along z-axis ( Fig.1(b)). 4,5 The prominent microscopic character of the CE phase is the appearance of CO 6 and ferromagnetic (FM) zigzag stripes ( Fig.1(a)), 7 which is believed to be the effect of the competition among various interactions. Theoretical 8 and experimental 9 evidences available so far allow us to argue that the above scenario is oversimplified, and our conventional understanding of the CE phase in simple mixed-valent oxides, e.g.…”

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Jahn-Teller distortion induced charge ordering in the CE phase of manganites

et al. 2006

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[Abstract] The charge order of CE phase in half-doped manganites is studied, based on an argument that the charge-ordering is caused by the Jahn-Teller distortions of MnO 6 octahedra rather than Coulomb repulsion between electrons. The quantitative calculation on the ferromagnetic zigzag chain as the basic structure unit of CE phase within the framework of two-orbital double exchange model including Jahn-Teller effect is performed, and it is shown that the charge-disproportionation of Mn cations in the charge-ordered CE phase is less than 13%. In addition, we predict the negative charge-disproportionation once the Jahn-Teller effect is weak enough.

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Pairing of charge-ordered stripes in (La,Ca)MnO3

Cited by 651 publications

References 20 publications

Charge-ordering cascade with spin–orbit Mott dimer states in metallic iridium ditelluride

Charge-ordering cascade with spin–orbit Mott dimer states in metallic iridium ditelluride

Charge and lattice dynamics of ordered state in La1/2Ca1/2MnO3: infrared reflection spectroscopy study

Jahn-Teller distortion induced charge ordering in the CE phase of manganites

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