Superconducting phase of<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>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>: A superconducting composition resulting f

Jorgensen, J. D.; Dąbrowski, B.; Pei, Shiyou; Hinks, D.G.; Soderholm, L.; Morosin, B.; Schirber, J. E.; Venturini, E. L.; Ginley, D. S.

doi:10.1103/physrevb.38.11337

Cited by 608 publications

(182 citation statements)

References 30 publications

Supporting

Mentioning

175

Contrasting

Order By: Relevance

“…A phase separation transition was observed experimentally a long time ago in the La 2 CuO 4+y [5]. In this experiment the phase separation of the interstitials oxygen are accompanied by an electronic phase separation of holes in CuO 2 planes.…”

Section: Introductionmentioning

confidence: 73%

“…Earlier it was believed that the underline mechanism of electronic phase separation was associated with defects, oxygen or cation disorder. Indeed, oxygen phase segregation was observed on the La 2 CuO 4+δ by x-ray and transport measurements [5,15]. However depending on the type of experiment, there are some HTSC materials, specially YBCO, that appear to be more homogeneous or, at least do not display any gross inhomogeneity [38,39].…”

Section: Electronic Phase Separationmentioning

confidence: 99%

See 1 more Smart Citation

Random resistivity network calculations for cuprate superconductors with an electronic phase separation transition

Pinheiro¹,

Mello²

2012

Physica A: Statistical Mechanics and its Applications

View full text Add to dashboard Cite

The resistivity as function of temperature of high temperature superconductors is very unusual and despite its importance lacks an unified theoretical explanation. It is linear with the temperature for overdoped compounds but it falls more quickly as the doping level decreases. The resistivity of underdoped cuprates increases as an insulator below a characteristic temperature where it shows a minimum. We show that this overall behavior can be explained by calculations using an electronic phase segregation into two main component phases with low and high electronic densities. The total resistence is calculated by the various contributions through several random picking processes of the local resistivities and using a common statistical Random Resistor Network approach.

show abstract

Section: Introductionmentioning

confidence: 73%

Section: Electronic Phase Separationmentioning

confidence: 99%

Random resistivity network calculations for cuprate superconductors with an electronic phase separation transition

Pinheiro¹,

Mello²

2012

Physica A: Statistical Mechanics and its Applications

View full text Add to dashboard Cite

show abstract

“…Several groups also have found that bulk superconductivity above 30 K can be produced in La2CuO4 by annealing powders or single crystals at high oxygen pressure [ 18,20]. The weight gain in this process corresponds to producing La2CuO4.t3 and these authors believe the excess oxygens go in as Oy (superoxide), based on iodometric titration measurements giving the amount of [ Cu-O ] ÷ in the sample.…”

Section: (T=r(a-o)/xfl} R(b-o)mentioning

confidence: 99%

“…La 2 Sr Cu 2 06 have shown that the La:Cu ratio is 2:1 within experimental error ( < 1%) [ 17,18 ]. It is also known that the oxygen stoichiometry corresponds to La2CuO4 within ~ 1%.…”

Section: (T=r(a-o)/xfl} R(b-o)mentioning

confidence: 99%

Properties of La2CuO4 and related compounds

Cheong

Thompson

Fisk

1989

Physica C: Superconductivity

119

View full text Add to dashboard Cite

We review the crystal chemical, electronic, magnetic and superconducting properties of La2CuO4 and related planar-cuprate materials, with emphasis on single-crystal results. Although magnetism due to divalent copper ions clearly is evident in nonsuperconducting crystals, experiments do not reveal any direct relationship between localized copper spins and high temperature superconductivity. We also indicate areas where important information is lacking for our understanding of these materials.

show abstract

“…The first one is of particular interest because the intermediate compounds (lithiated phases) could be further used to prepare new inorganic-organic materials, similarly to that reported for MoS 2 and other disulfides. 4,8,[21][22][23][24][25]44 The lithium chemical insertion (i.e., the so-called lithiation reaction) was carried out by using n-BuLi, a method broadly used in intercalation chemistry. 6,7 In the same way that observed for MoS 2 , TaS 2 and other dichalcogenides (such as TiS 2 and ZrS 2 ), 45 lithiated phases of the ternary disulfides can be prepared.…”

Section: Lithium Insertion In Ta X Mo 1-x S 2 Dichalcogenidesmentioning

confidence: 99%

Intercalation and electrical behavior of Ta xMo1-xS2 (x > 0.5) layered mixed disulfides

Lara¹,

Ruiz²,

Manrı́quez³

et al. 2012

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Este trabalho relata um estudo sistemático do comportamento estrutural e elétrico de três fases ternárias do sistema Ta x Mo 1-x S 2 (x = 0,55, 0,75 e 0,90) e de seus compostos de intercalação resultantes das inserções química e eletroquímica de lítio, assim como das intercalações de piridina e poli(óxido de etileno). As três fases foram preparadas pela reação direta de seus elementos constituintes, sem qualquer outro aditivo, a 900 o C em atmosfera inerte. Os compostos resultantes foram caracterizados por meio de difratometria de raios X de pó (XRD), análises termogravimétrica e térmica diferencial (TGA/DTA), fluorescência de raios X por dispersão de energia (EDX) e microscopia eletrônica de varredura com emissão de campo (FE-SEM). A condutividade elétrica dos diferentes compostos preparados foi medida no intervalo de temperatura 1,5-300 K utilizando o método convencional de sonda de quatro pontas van der Pauw na presença de um campo magnético de 9 T para verificar a ocorrência do fenômeno de magnetoresistividade.This work reports a systematic study of the structural and electrical behavior of three ternary phases of the Ta x Mo 1-x S 2 system (x = 0.55, 0.75 and 0.90) and their intercalation compounds resulting from both chemical and electrochemical lithium insertions, as well as from pyridine and poly(ethylene oxide) intercalations. The three ternary phases were prepared by direct reaction of their constituting elements, without any other additive, at 900 ºC in inert atmosphere. The resulting compounds were characterized by means of X-ray powder diffractometry (XRD), thermogravimetric and differential thermal (TGA/DTA) analyses, energy dispersive X-ray fluorescence (EDX) and field emission-scanning electron microscopy (FE-SEM). The electrical conductivity of the different products was measured in the 1.5-300 K temperature range using the conventional four probe van der Pauw method in the presence of a 9 T magnetic field in order to verify the occurrence of magnetoresistivity phenomena. Keywords: chalcogenides, intercalation, pyridine, PEO, conductivity IntroductionThe renewed interest to study layered solids is originated from the observation of unusual physical properties associated with anisotropy phenomena in such type of low-dimensional materials. Another important reason why 2D solids are investigated is their ability to intercalate a large variety of compounds. [1][2][3][4][5][6][7][8][9] In this context, physical properties such as electrical conductivity and electrochemical behavior of layered solids can be deliberately modified by intercalation of organic species. [2][3][4]10,11 Among different 2D solids, the study of layered transition-metal dichalcogenides (LTMDs) has become the subject of an active field of research in solid state physics and chemistry during the last decades. 1,12,13 One of the most salient physical properties of these materials is their electrical conductivity (and superconductivity) behavior, which is related to phase transitions usually driven by charge density wave mechanisms...

show abstract

Superconducting phase ofLa2CuO4+δ: A superconducting composition resulting f

Cited by 608 publications

References 30 publications

Random resistivity network calculations for cuprate superconductors with an electronic phase separation transition

Random resistivity network calculations for cuprate superconductors with an electronic phase separation transition

Properties of La2CuO4 and related compounds

Intercalation and electrical behavior of Ta xMo1-xS2 (x > 0.5) layered mixed disulfides

Contact Info

Product

Resources

About