Stripe Conductivity in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>La</mml:mi></mml:mrow><mml:mrow><mml:mn>1.775</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.225</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>NiO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Pashkevich, Yu. G.; Blinkin, V. A.; Gnezdilov, V. P.; Tsapenko, V. V.; Eremenko, V. V.; Lemmens, P.; Fischer, Mark H.; Grove, M.; Güntherodt, G.; Degiorgi, L.; Wächter, P.; Tranquada, J. M.; Buttrey, Douglas J.

doi:10.1103/physrevlett.84.3919

Cited by 36 publications

(36 citation statements)

References 28 publications

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“…The origin of the extra lines in the stripe-ordered state and their assignment were made in Ref. 26. Now we turn to the measurements in zz polarization configuration.…”

Section: Resultsmentioning

confidence: 99%

“…To test the effect of a magnetic field on stripe ordering, we performed a RS experiments on a piece of the same La 1.775 Sr 0.225 NiO 4 crystal that we have been characterized in detail elsewhere [12,15,26]. In this sample the hole density per Ni site along a stripe is significantly less than 1 (electron filling fraction d > 0) in contrast to the x = 1/3 sample, where the density is exactly 1.…”

Section: Phonons and Magnons In Stripe-ordered Nickelates A Raman Scmentioning

confidence: 99%

“…These bands were interpreted as two-magnon scattering [23,24,26]. What was the reason for this attribution?…”

Section: Phonons and Magnons In Stripe-ordered Nickelates A Raman Scmentioning

confidence: 99%

“…7 the temperature dependence of the integrated intensity for both bands in the x = 0.225 crystal is given. The first band was assigned to the two-magnon excitation within the antiferromagnetic domain and the second one to the excitation across the domain wall [23,26] or to the excitation on the Ni 2+ -Ni 3+ bond [24]. Accurate account of the spin-1 system gives peak positions of w 1 » 3J and w 2 » 4J for the x = 1/3 Ni-centered stripes.…”

Section: Phonons and Magnons In Stripe-ordered Nickelates A Raman Scmentioning

confidence: 99%

“…Despite very intense studies in the stripe physics field, it is somewhat surprising that there are only a few Raman scattering (RS) studies of this exotic form of order [12,[23][24][25][26] and some deficiencies in our knowledge of light scattering in striped phases are now evident. For example, under the discussion is the question of RS from spin waves.…”

Section: Introductionmentioning

confidence: 99%

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Phonons and magnons in stripe-ordered nickelates. A Raman scattering study

Gnezdilov

Kurnosov

Yeremenko

et al. 2005

Low Temperature Physics

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Electronic correlation effects in La 2-x Sr x NiO 4 (x = 1/3 and 0.225) lead to spontaneous phase separation into microscopic spin/charge stripes with commensurate and incommensurate order, respectively. Raman scattering experiments on such single crystalline materials show a rich phenomenology of phonon and magnon anomalies due to the new, self-organized periodicities. These effects are observable as function of temperature but can also be induced by cooling in a seemingly small magnetic field leading to a reorganization of stripe structure.

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“…The origin of the extra lines in the stripe-ordered state and their assignment were made in Ref. 26. Now we turn to the measurements in zz polarization configuration.…”

Section: Resultsmentioning

confidence: 99%

Section: Phonons and Magnons In Stripe-ordered Nickelates A Raman Scmentioning

confidence: 99%

“…These bands were interpreted as two-magnon scattering [23,24,26]. What was the reason for this attribution?…”

Section: Phonons and Magnons In Stripe-ordered Nickelates A Raman Scmentioning

confidence: 99%

Section: Phonons and Magnons In Stripe-ordered Nickelates A Raman Scmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Phonons and magnons in stripe-ordered nickelates. A Raman scattering study

Gnezdilov

Kurnosov

Yeremenko

et al. 2005

Low Temperature Physics

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How Cation Substitutions Affect the Oxygen Reduction Reaction on La_2−xSr_xNi_1−yFe_yO₄

2022

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The atomic proximity of two disparate structural motifs in interleaved structures such as that adopted by La2NiO4, which alternates rock salt and perovskite motifs, offers potential synergistic effects and increased tunability for electrocatalyst behavior. Structural and voltammetric analysis of the intersecting composition series LaSrNi1−yFeyO4+δ and La2−xSrxNi0.7Fe0.3O4+δ show that tuning different cation sites uniquely affects structure and behavior. Correlations between X‐ray diffraction and Raman spectroscopy results reveal that structural changes in the a‐b plane are uniformly matched by the c‐axis following La−Sr exchange, while Ni−Fe exchange distorts the structure by expanding the crystal c‐axis and generating oxygen defects with a distinct signature in Raman spectra. Correlations between rotating ring‐disk electrode voltammetry results and structural parameters show that only Fe substitution has a direct effect on the electrocatalytic oxygen reduction reaction. We link systematic changes observed for onset of electrocatalytic oxygen reduction reaction, Tafel slope, and selectivity to distortions in the B‐site environments. This analysis demonstrates that correlational analysis linking electrochemical behavior parameters to multiple structural characterization techniques is an effective means to probe the effect of individual compositional substitution on electrocatalytic behavior.

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