Phonon Anomalies due to Collective Stripe Modes in High<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>Cuprates

Kaneshita, Eiji; Ichioka, Masanori; Machida, Kazushige

doi:10.1103/physrevlett.88.115501

Cited by 41 publications

(44 citation statements)

References 30 publications

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“…We do not know of any calculations that properly describe the charge-stripe fluctuations that we observe. Using a model appropriate for cuprates, Kaneshita et al 42 calculated charge collective modes that disperse steeply from the charge-order wave vector and leave detectable anomalies when they cross (and mix with) phonon branches, however, there was no prediction of a low-energy lattice response independent of the phonon modes. Presumably, one must account for the strong electron-lattice coupling in nickelates 39 .…”

Section: Discussionmentioning

confidence: 99%

Direct observation of dynamic charge stripes in La2–xSrxNiO4

Anissimova

Parshall

et al. 2014

Nat Commun

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The insulator-to-metal transition continues to be a challenging subject, especially when electronic correlations are strong. In layered compounds, such as La 2-x Sr x NiO 4 and La 2-x Ba x CuO 4 , the doped charge carriers can segregate into periodically spaced charge stripes separating narrow domains of antiferromagnetic order. Although there have been theoretical proposals of dynamically fluctuating stripes, direct spectroscopic evidence of charge-stripe fluctuations has been lacking. Here we report the detection of critical lattice fluctuations, driven by charge-stripe correlations, in La 2-x Sr x NiO 4 using inelastic neutron scattering. This scattering is detected at large momentum transfers where the magnetic form factor suppresses the spin fluctuation signal. The lattice fluctuations associated with the dynamic charge stripes are narrow in q and broad in energy. They are strongest near the charge-stripe melting temperature. Our results open the way towards the quantitative theory of dynamic stripes and for directly detecting dynamical charge stripes in other strongly correlated systems, including high-temperature superconductors such as La 2-x Sr x CuO 4 .

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Section: Discussionmentioning

confidence: 99%

Direct observation of dynamic charge stripes in La2–xSrxNiO4

Anissimova

Parshall

et al. 2014

Nat Commun

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“…The calculations presented in Ref. [29] predicted that the parallel stripes are accompanied by collective charge excitations with the momentum transfer q s . Qualitatively similar excitations are expected for the diagonal stripes.…”

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confidence: 99%

Charge Excitations in the Stripe-OrderedLa5/3Sr1/3NiO4andLa

et al. 2009

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Charge excitations were studied for stipe-ordered 214 compounds, La 5/3 Sr 1/3 NiO4 and 1/8-doped La2(Ba, Sr)xCuO4 using resonant inelastic x-ray scattering in hard x-ray regime. We have observed charge excitations at the energy transfer of ∼ 1 eV with the momentum transfer corresponding to the charge stripe spatial period both for the diagonal (nikelate) and parallel (cuprates) stripes. These new excitations can be interpreted as a collective stripe excitation or charge excitonic mode to a stripe-related in-gap state.There is accumulation of theoretical and experimental implications that the inhomogeneous charge state, such as a charge stripe state, occurring as a result of the carrier doping into the strongly correlated electron system is intimately related to the realization of high temperature superconductivity in cuprates [1,2]. Understanding the dynamics of the charge stripe state is one of the basic problems. To date, whereas the dynamics in spin sector has been studied extensively by neutron scattering [3,4,5,6], the dynamics in charge sector is yet to be understood.The 214 type nickelates and cuprates, family compounds of the firstly discovered high temperature superconductor La 2−x Ba x CuO 4 , exhibit charge stripe order when holes are doped. The stripe order has been comprehensively studied by diffraction techniques [7,8,9,10] and characterized by antiphase antiferromagnetic domains divided by one dimensional charge stripes where doped holes are confined. Upon carrier doping, La 2−x Sr x NiO 4 (LSNO) shows ordered state of "diagonal" stripes, where the charge stripes run along the diagonal direction of the NiO 2 square lattice [7] (Fig. 1 a). Holedoped 214 cuprates La 2−x (Ba, or Sr) x CuO 4 (LBCO or LSCO) show diagonal stripe order in the low doping insulating region [11], whereas in the superconducting dome the systems, particularly LBCO, show static order of "parallel" stripes only in the vicinity of x = 0.125 [12,13] where the superconductivity is suppressed [14]. This is frequently quoted as 1/8 anomaly. Here the charge stripes are parallel to the Cu-O-Cu bond (Fig. 1 b). Consequently, relation between the dynamical fluctuation of parallel stripes and the superconductivity is of interest.Resonant inelastic x-ray scattering (RIXS) in hard xray regime, a recently developed experimental probe, have revealed various types of charge excitations in the strongly correlated electron systems, such as the charge RIXS is an ideal probe for detecting charge excitations associated with the stripe having a specific momentum

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“…If stripes interact with phonons via a mechanism discussed in Ref. 35,49, then the effect of dynamic stripes should occur at a different wave vector, q = (0.25, 0, 0), not at the zone boundary. In fact we find that the huge phonon line widths reported near this wave vector in Ref.…”

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Effects of charge inhomogeneities on elementary excitations inLa2−xSrxCuO4

et al. 2011

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Purely local experimental probes of many copper oxide superconductors show that their electronic states are inhomogeneous in real space. For example, scanning tunneling spectroscopic (STS) imaging shows strong variations in real space, and according to nuclear quadrupole resonance (NQR) studies the charge distribution in the bulk varies on the nanoscale. However, the analysis of the experimental results utilizing spatially-averaged probes often ignores this fact. We have performed a detailed investigation of the doping-dependence of the energy and line width and position of the zone-boundary Cu-O bond-stretching vibration in La2−xSrxCuO4 by inelastic neutron scattering. Both our new results as well as previously reported angle-dependent momentum widths of the electronic spectral function detected by angle-resolved photoemission can be reproduced by including the same distribution of local environments extracted from the NQR analysis.

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Phonon Anomalies due to Collective Stripe Modes in HighTcCuprates

Cited by 41 publications

References 30 publications

Direct observation of dynamic charge stripes in La2–xSrxNiO4

Direct observation of dynamic charge stripes in La2–xSrxNiO4

Charge Excitations in the Stripe-OrderedLa5/3Sr1/3NiO4andLa

Effects of charge inhomogeneities on elementary excitations inLa2−xSrxCuO4

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