Optical spectroscopy of the charge-ordering transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>1.67</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.33</mml:mn></mml:mrow></mml:msub></mml:mrow></mml

Katsufuji, T.; Tanabe, Tatsuhiko; Ishikawa, Tadaharu; Fukuda, Yasukazu; Arima, T.; Tokura, Y.

doi:10.1103/physrevb.54.r14230

Cited by 170 publications

(154 citation statements)

References 27 publications

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“…Optical conductivity measurements [29][30][31][32] of the stripe-ordered phase in La 2-x Sr x NiO 4 þ y reveal a broad peak centred at 0.6-0.8 eV, with a gap (measured at the peak half-height) about half that size, consistent with localization of the charge. While nickelates develop a finite conductivity (qualifying them as bad metals) on warming through T co , a pseudogap remains, which only gradually decreases on heating to B2T co (refs 29,30,32,33).…”

Section: Discussionmentioning

confidence: 74%

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: 74%

Direct observation of dynamic charge stripes in La2–xSrxNiO4

Anissimova

Parshall

et al. 2014

Nat Commun

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“…From this formula it is easy to obtain a spectral weight shift proportional to (1 − 2n d ) 2 from low to high energy. It is worth to note that the shift of the spectral weight from low to high energy is a phenomenon actually observed in the Ni oxides together with an anomalous ratio 2∆(0)/T c = 13 [7]. Both observations are consistent with an intermediate coupling charge ordering of polarons.…”

Section: Resultssupporting

confidence: 71%

“…The amplitude of such a distortion increases from Cuprates to Manganites, a fact that may support the hypothesis of an increasing charge-lattice interaction. Another important observation supporting the presence of polaronic carrier, and therefore an intermediate-strong local charge-lattice interaction, is the presence of a polaronic peak in the MIR band of doped Ni compound [6] [7].…”

Section: Introductionmentioning

confidence: 99%

The Charge-Ordered State from Weak to Strong Coupling

Ciuchi

Pasquale

2002

Stripes and Related Phenomena

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We apply the Dynamical Mean Field Theory to the problem of charge ordering. In the normal state as well as in the Charge Ordered (CO) state the existence of polarons, i.e. electrons strongly coupled to local lattice deformation, is associated to the qualitative properties of the Lattice Polarization Distribution Function (LPDF). At intermediate and strong coupling a CO state characterized by a certain amount of thermally activated defects arise from the spatial ordering of preexisting randomly distributed polarons. Properties of this particular CO state gives a qualitative understanding of the low frequency behavior of optical conductivity of N i perovskites.

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“…This result is consistent with optical conductivity studies [169,170] which show that while the dc conductivity approaches that of a metal above room temperature, the dynamic conductivity in the disordered state never shows the response of a conventional metal.…”

Section: Charge and Spin Stripe Order In Nickelatessupporting

confidence: 80%

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Tranquada

Handbook of High-Temperature Superconductivity

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Summary. Neutron scattering studies have provided important information about the momentum and energy dependence of magnetic excitations in cuprate superconductors. Of particular interest are the recent indications of a universal magnetic excitation spectrum in hole-doped cuprates. That starting point provides motivation for reviewing the antiferromagnetic state of the parent insulators, and the destruction of the ordered state by hole doping. The nature of spin correlations in stripeordered phases is discussed, followed by a description of the doping and temperature dependence of magnetic correlations in superconducting cuprates. After describing the impact on the magnetic correlations of perturbations such as an applied magnetic field or impurity substitution, a brief summary of work on electron-doped cuprates is given. The chapter concludes with a summary of experimental trends and a discussion of theoretical perspectives. IntroductionNeutron scattering has played a major role in characterizing the nature and strength of antiferromagnetic interactions and correlations in the cuprates. Following Anderson's observation [1] that La 2 CuO 4 , the parent compound of the first high-temperature superconductor, should be a correlated insulator, with moments of neighboring Cu 2+ ions anti-aligned due to the superexchange interaction, antiferromagnetic order was discovered in a neutron diffraction study of a polycrystalline sample [2]. When single-crystal samples became available, inelastic studies of the spin waves determined the strength of the superexchange, J, as well as weaker interactions, such as the coupling between CuO 2 layers. The existence of strong antiferromagnetic spin correlations above the Néel temperature, T N , has been demonstrated and explained. Over time, the quality of such characterizations has improved considerably with gradual evolution in the size and quality of samples and in experimental techniques.Of course, what we are really interested in understanding are the optimallydoped cuprate superconductors. It took much longer to get a clear picture of the magnetic excitations in these compounds, which should not be surprising

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Optical spectroscopy of the charge-ordering transition inLa1.67Sr0.33

Cited by 170 publications

References 27 publications

Direct observation of dynamic charge stripes in La2–xSrxNiO4

Direct observation of dynamic charge stripes in La2–xSrxNiO4

The Charge-Ordered State from Weak to Strong Coupling

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

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