Dielectric response of the charge-ordered two-dimensional nickelate La1.5Sr0.5NiO4

Rivas, J.; Rivas‐Murias, B.; Fondado, A.; Mira, J.; Señarı́s-Rodrı́guez, M. A.

doi:10.1063/1.1834998

Cited by 75 publications

(47 citation statements)

References 13 publications

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“…For example, the recent discovery (1,2) of "colossal" values of the dielectric constant, ε', up to about 10 5 in CaCu 3 Ti 4 O 12 (CCTO) has aroused tremendous interest and a huge number of publications deals with its investigation and optimization. Aside of the extensively investigated CCTO, there are also some reports of other colossal-ε' materials (e.g., refs.…”

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confidence: 99%

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Colossal dielectric constant up to gigahertz at room temperature

Krohns

Lunkenheimer

Kant

et al. 2009

Applied Physics Letters

192

148

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In recent years, large effort has been put into the development and characterization of new colossal-ε' materials. For example, the recent discovery (1,2) of "colossal" values of the dielectric constant, ε', up to about 10 5 in CaCu 3 Ti 4 O 12 (CCTO) has aroused tremendous interest and a huge number of publications deals with its investigation and optimization. Aside of the extensively investigated CCTO, there are also some reports of other colossal-ε' materials (e.g., refs. (3,4,5,6,7)), mainly transition metal oxides. While there is no clear definition, the term "colossal" typically denotes values of ε' > 10 4 . Such materials are very appealing for the further miniaturization of capacitive components in electronic devices and also in giant capacitors that may replace batteries for energy storage.Of course, colossal dielectric constants are also found in ferroelectrics where close to the phase transition very large values are reached. However, ferroelectrics are characterized by a strong temperature dependence of ε' around their critical temperature, which restricts their applicability. In contrast, CCTO and other materials stand out due to their colossal-ε' values being nearly constant over a broad temperature range around room temperature. But in all these materials a strong frequency dependence is observed, revealing the signature of relaxational contributions, namely a steplike decrease of ε' above a certain, temperaturedependent frequency, accompanied by a peak in the dielectric loss. Intrinsic relaxations are commonly observed, e.g., in materials containing dipolar molecules, which reorient in accord with the ac field at low frequencies, but cannot follow at high frequencies. However, the extensive investigations of CCTO, have quite clearly revealed that the observed relaxation features are due to a nonintrinsic effect, termed Maxwell-Wagner (MW) relaxation (8,9,10). It arises from heterogeneity of the sample, which is composed of a bulk region with relatively high conductivity and one or several relatively insulating thin layers. The equivalent circuit describing such a sample leads to a relaxation-like frequency and temperature dependence (10). The insulating layers can arise, for example, from surface effects (e.g., depletion regions of Schottky diodes at the electrodes) or internal barriers (e.g., grain boundaries). However, this is rather irrelevant from an application point of view (e.g., external surface layers are used to enhance the capacitance in ferroelectrics-based multi-layer ceramic capacitors). Thus, although in CCTO the exact mechanism is not yet finally clarified, the interest in this material is still high. This is, amongst others, demonstrated by the fact that since its discovery in 2000, twelve socalled "highly-cited" papers on this topic have appeared (source: ISI Web of Science, Nov. 2008). Unfortunately, at room temperature the relaxation in CCTO leads to a decrease of ε' in the MHz region and around GHz only values of the order of 100 are observed (8,11,12). In contrast, electron...

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“…Aside of the extensively investigated CCTO, there are also some reports of other colossal-ε' materials (e.g., refs. (3,4,5,6,7)), mainly transition metal oxides. While there is no clear definition, the term "colossal" typically denotes values of ε' > 10 4 .…”

mentioning

confidence: 99%

Colossal dielectric constant up to gigahertz at room temperature

Krohns

Lunkenheimer

Kant

et al. 2009

Applied Physics Letters

192

148

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“…At higher frequencies tanδ exponentially decreases up to reach values ranged between 2 and 10. These high dielectric charge condensation that takes place in some systems with cations of variable valence, such as Ni (8,9). The extrinsic factors are associated to the interfacial polarization produced in grain boundaries and contacts sample-electrode (7).…”

Section: Resultsmentioning

confidence: 99%

Comportamiento dieléctrico de La1-xCaxMnO3 (0.4 â¤ x â¤ 0.5)

Botta¹,

Mira²,

Fondado³

et al. 2006

Bol. Soc. Esp. Ceram. Vidr.

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In this work the dielectric behavior of semiconducting La-manganites in an intermediate Ca-doping regime is studied. Ceramic samples were prepared by conventional solid-state reaction, using elemental oxides as starting reactants. A chemical, structural and microstructural characterization of the prepared manganites was performed by iodometric titrations, X-ray diffraction and scanning electron microscopy, respectively. The magnetic susceptibility and electrical resistivity as a function of temperature were also measured. The complex dielectric permittivity of the samples was determined as a function of frequency and temperature. Very high values of dielectric constant in a wide frequency and temperature range were observed for all the synthesized samples. Moreover, an increase of the dielectric constant at temperatures close to chargeorder or metal-insulator transition is reported. Keywords: dielectric constant, manganites, charge-order, perovskites.Comportamiento dieléctrico de La 1-x Ca x MnO 3 (0.4 ≤ x ≤ 0.5) En este trabajo se estudia el comportamiento dieléctrico de manganitas de La dopadas con Ca en un rango de composición cercano a 0.5. Se prepararon muestras cerámicas por el método de reacción en estado sólido, utilizando los óxidos elementales como reactivos. Los materiales obtenidos fueron caracterizados química, estructural y microestructuralmente mediante titulaciones iodométricas, difracción de rayos X y microscopía electrónica de barrido, respectivamente. Se hicieron medidas de susceptibilidad magnética y resistividad eléctrica en función de la temperatura. Además se determinó la permitividad dieléctrica compleja de las muestras sintetizadas en función de la frecuencia y la temperatura. Se observaron valores muy elevados de la constante dieléctrica en un amplio rango de frecuencias y temperaturas para todos los materiales obtenidos. También se encontró un aumento de la constante dieléctrica a temperaturas cercanas a las de las transiciones de orden de carga o metal-aislante sufridas por estos materiales.Palabras clave: constante dieléctrica, manganitas, orden de carga, perovskitas.

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“…The first evidence of this link has been reported by F. Rivadulla et al (10) (12). Nevertheless, only very recently their dielectric behavior starts to attract attention (13,14). In the context of charge ordering (CO) both compounds are examples of CO by stripe order.…”

Section: Introductionmentioning

confidence: 97%

Caracterización estructural de los óxidos de níquel con orden de carga: La3/2Sr1/2NiO4 y La5/3Sr1/3NiO4

Rivas‐Murias¹,

Mira²,

Fondado³

et al. 2006

Bol. Soc. Esp. Ceram. Vidr.

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In this work, we study the dielectric properties of the layered perovskites La 3/2 Sr 1/2 NiO 4 En este trabajo, se estudian las propiedades dieléctricas de las perovskitas laminares La 3/2 Sr 1/2 NiO 4 y La 5/3 Sr 1/3 NiO 4 en el intervalo de frecuencias 20 Hz-1 MHz y en el intervalo de temperaturas 110-350 K. Para este estudio, se han sintetizado muestras policristalinas y monofásicas mediante el método cerámico. Estos compuestos presentan unos altos valores de la constante dieléctrica a temperatura ambiente (ε' r ~ 10 5 ), lo cual los hace muy atractivos para posibles aplicaciones tecnológicas siempre y cuando se puedan reducir sus relativamente altas pérdidas dieléctricas. Los resultados obtenidos muestran que aunque la respuesta dieléctrica está fuertemente realzada debido a efectos extrínsecos de polarización interfacial, se observa una correlación interesante entre las propiedades dieléctricas y el estado electrónico de los compuestos.Palabras clave: constante dieléctrica, orden de carga, perovskitas laminares.

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Dielectric response of the charge-ordered two-dimensional nickelate La1.5Sr0.5NiO4

Cited by 75 publications

References 13 publications

Colossal dielectric constant up to gigahertz at room temperature

Colossal dielectric constant up to gigahertz at room temperature

Comportamiento dieléctrico de La<sub>1-x</sub>Ca<sub>x</sub>MnO<sub>3</sub> (0.4 â¤ x â¤ 0.5)

Caracterización estructural de los óxidos de níquel con orden de carga: La<sub>3/2</sub>Sr<sub>1/2</sub>NiO<sub>4</sub> y La<sub>5/3</sub>Sr<sub>1/3</sub>NiO<sub>4</sub>

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Dielectric response of the charge-ordered two-dimensional nickelate La1.5Sr0.5NiO4

Cited by 75 publications

References 13 publications

Colossal dielectric constant up to gigahertz at room temperature

Colossal dielectric constant up to gigahertz at room temperature

Comportamiento dieléctrico de La<sub>1-x</sub>Ca<sub>x</sub>MnO<sub>3</sub> (0.4 â¤ x â¤ 0.5)

Caracterización estructural de los óxidos de níquel con orden de carga: La<sub>3/2</sub>Sr<sub>1/2</sub>NiO<sub>4</sub> y La<sub>5/3</sub>Sr<sub>1/3</sub>NiO<sub>4</sub>

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Comportamiento dieléctrico de La<sub>1-x</sub>Ca<sub>x</sub>MnO<sub>3</sub> (0.4 â¤ x â¤ 0.5)