A new mercury-based superconductor: (Hg, Cr)Sr2CuO

Shimoyama, J.; Hahakura, S.; Kitazawa, K.; Yamafuji, Kaoru; Kishio, K.

doi:10.1016/0921-4534(94)90597-5

Cited by 95 publications

(45 citation statements)

References 16 publications

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“…Few months later, the 1212, 1223 and 1234 members were stabilized, corresponding to the general formula HgBa2Cam_iCumO2m+2+a with m = 1, 2, 3 In the strontium based cuprates, Hgl_~MxSr2Cam_lCumOZm+2+a ((Hg,M)SC), mixed layers have been conceived with M = Cu, Sr, Bi, Tl, Pb, Pr, Cr, Mo, Ce, Re; they are either of 1201-type [14][15][16][17] or of 1212-type [18][19][20][21][22][23][24]. In the barium based cuprates, Hgi-~M~Ba2Ca~-iCu~02~+2+( (Hg,M)BC), M can be Ca, Bi, Pb, V, Mo, W, Ti, Cr, Al, Ga, Ge [25][26][27][28][29][30] Figure Ib, the 1223 cuprate Hgo,BBio,2Ba2CaZCu30g+s, where the positions of the cations are imaged as white dots so that the sequence of the layers along c can be easily identified (marked in the right part of the micrograph).…”

Section: Introductionmentioning

confidence: 99%

Mixed Layers in Copper Based Superconducting Materials

Hervieu

Tendeloo

Michel

et al. 1996

Microsc. Microanal. Microstruct.

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Abstract. 2014 Recently discovered series of high Tc superconductors, characterized by the existence of two types of cations within the same layer, are presented. The first family concerns the mercury based cuprates, Hg1-xMxA2Cam-1CumO2m+2+03B4, with A = Ba and/or Sr, which exhibit structures closely related to that of the thallium cuprates TlBa2Cam-1CumO2m+3. They differ from the thallium cuprates by a high oxygen deficiency at the level of the mercury layer. It is shown that cations such as M = Cu, Pb, Tl, Bi, Ce, Pr, Cr, V, Mo, W, Ti, Sr, Ca,... can partially substitute for mercury ions, stabilizing the structures. The cationic composition of the layer depends indeed on the nature of the M cation but also on that of the alkaline earth A. For given A and M cations, the x value remains unchanged even when the number of copper layers varies. M and Hg cations are either statistically distributed over the same site or ordered. Different types of ordering have been detected. Another way of generating mixed layers is to shear periodically the structure, leading to the formation of the so called "collapsed phase". In the collapsed bismuth cuprates, bismuth and copper segments, a few octahedra long, alternate in strongly waving layers. In the collapsed oxycarbonates, carbonate groups and M cations are ordered within the intermediate layer so that they can be simply described from a partial and ordered substitution of carbon for Hg,Tl, Bi and other M cations building the intermediate layer. The oxycarbonitrates (Y1-xCax)nBa2nCu3n-1(C,N)O3O7n-3 can also be described as an ordered substitution of carbon for copper in the 123 matrix. The different families of superconducting materials which are generated by such mechanisms are described as well as the way the different species are distributed within the mixed layers. Their influence on the physical properties are discussed.

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Section: Introductionmentioning

confidence: 99%

Mixed Layers in Copper Based Superconducting Materials

Hervieu

Tendeloo

Michel

et al. 1996

Microsc. Microanal. Microstruct.

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“…Often, the substitution takes place with no detriment to the superconducting properties and in certain cases actually serves to ensure the stabilization of the particular phase as well as to improve the properties. (12,13) cannot be stabilized under normal pressure without such substitution at the Hg site. In many of the mercury cuprates, the Hg ion is largely two-coordinate, resembling in some sense, Cu I in the ''0201-0212'' phase.…”

Section: Fig 1 Schematic Representations Of the Comentioning

confidence: 97%

Substitution of Chromium for Univalent Copper in Superconducting Pb2Sr2(Ca,Y)Cu3O8+δ

Seshadri¹,

Maignan²,

Hervieu³

et al. 1996

Journal of Solid State Chemistry

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“…Moreover, partial substitution of Hg by such high-valence transition elements is*up to now*the only way of stabilizing the Ba-free HgSr Ca L\ Cu L O L>>B series. For HgSr CuO X partial substitution of Cr, Mo, and Re for Hg (10,11) was necessary for structural stabilization, and ¹ was lower than 75 K. In the case of the (Hg, M)Sr CaCu O X , an additional substitution of a rare-earth element for Ca is required for synthesis under ambient pressure (11}20). ¹ of these (Hg, M)-1212 compounds was approximately 100 K.…”

Section: Introductionmentioning

confidence: 99%