MoxCu1−xSr2YCu2Oy (0.3≤x≤1) revisited: Superconductivity, magnetism and the molybdenum oxidation state

Marik, Sourav; Morán, E.; Labrugère, Christine; Toulemonde, Olivier; Alario-Franco, M.Á.

doi:10.1016/j.jssc.2012.02.015

Cited by 13 publications

(27 citation statements)

References 23 publications

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“…[11][12][13] The sample compositions, annealing (oxygenation process) conditions, and their naming details are presented in Table 1. [11][12][13] The sample compositions, annealing (oxygenation process) conditions, and their naming details are presented in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…14 However, the superconducting transition temperatures of Mo 0.3 Cu 0.7 Sr 2 RECu 2 O y materials can be almost as high as that of YBCO when they are oxygenated under high pressure. 11 As a result, the as-prepared molybdo-cuprate compounds show interesting physical properties. 11 As a result, the as-prepared molybdo-cuprate compounds show interesting physical properties.…”

Section: Introductionmentioning

confidence: 99%

“…13,[15][16][17] Interestingly, in these compounds, Mo partially adopts the Mo V oxidation state, which induces magnetic interactions within the charge reservoir layer. [11][12][13]18,19 Previous crystal structure studies [11][12][13]16,[20][21][22] show that all the Mo 0.3 Cu 0.7 Sr 2 RECu 2 O y compounds adopt a tetragonal structure with the P4/mmm space group. [11][12][13]18,19 Previous crystal structure studies [11][12][13]16,[20][21][22] show that all the Mo 0.3 Cu 0.7 Sr 2 RECu 2 O y compounds adopt a tetragonal structure with the P4/mmm space group.…”

Section: Introductionmentioning

confidence: 99%

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Core-level photoemission spectra of Mo_0.3Cu_0.7Sr₂ErCu₂O_y, a superconducting perovskite derivative. Unconventional structure–property relationships

et al. 2015

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Detailed studies of the electronic states for Mo(0.3)Cu(0.7)Sr(2)ErCu(2)Oy samples with different oxygen contents are presented here. The influence of oxygenation on the electronic states for the Mo(0.3)Cu(0.7)Sr(2)ErCu(2)Oy system from the semiconducting to the superconducting state has been investigated by means of X-ray photoelectron spectroscopy (XPS). The XPS studies show that Mo is in a mixed Mo(V) and Mo(VI) oxidation state and Mo(V) is predominant over the Mo(VI) in the as-prepared (AP) sample. Yet annealing under an oxygen atmosphere enhances the Mo(VI) state. At the same time, a reduction in the copper species is observed. In the Cu 2p spectra, a larger energy separation between the satellite and main peaks (E(S)-E(M)) and a lower intensity ratio (I(S)/I(M)) are found to correlate with higher values of the superconducting transition temperature (T(C)). Analysis of these spectra within the Configuration Interaction (CI) model suggests that higher values of TC are related to lower values of the O 2p-Cu 3d charge transfer energy. The change in the Sr 3d and O 1s core level spectra correlates with the oxygen insertion in the (Mo/Cu)O(1+δ) chain site, after oxygenation. The hole concentration (Ph) in the copper plane has been obtained using the room temperature thermoelectric power (TEP) value; this shows an increasing tendency with increasing T(C), after oxygenation. From these experimental results, one observes that T(C)increases with decreasing charge transfer energy. This is, indeed, opposite to the accepted views and occurs in parallel with the shortening of the apical copper-oxygen distance (Cu(2)-O(2)) and the increasing of the CuO(2) plane buckling angle.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Core-level photoemission spectra of Mo_0.3Cu_0.7Sr₂ErCu₂O_y, a superconducting perovskite derivative. Unconventional structure–property relationships

et al. 2015

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“…[21][22][23] The sample compositions, annealing (oxygenation process) conditions and their naming details are shown in the table 1.…”

Section: Methodsmentioning

confidence: 99%

“…18 Recently, and contrary to previous claims of coexistence of anti-ferromagnetism (AFM) and SC in Mo−1212 compounds, as suggested by several groups, 19,20 we have shown that there is no coexistence of magnetism and superconductivity in these compounds, with our work on Mo x Cu 1-x Sr 2 YCu 2 O y . 21 In fact, full replacement of Mo for the copper chain site is not possible at ambient pressure; a pure compound can only form with x ≤ 0.3 nominal composition.…”

Section: Introductionmentioning

confidence: 99%

1212-Molybdo-Cuprates; effect of oxygenation in the structure, properties and electronic states

et al. 2014

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The influence of oxygenation in the magnetism, superconductivity and electronic states for the Mo 0.3 Cu 0.7 Sr 2 RECu 2 O y (RE = Y, Er and Tm) compounds are discussed here. The magnetic measurements on the as-prepared (AP) samples suggest the existence of short-range magnetic correlations due to the presence of the paramagnetic Mo V cations in the copper chain site. On the other hand, all the oxygenated samples are not magnetic but superconducting. The high pressure oxygenated sample shows the highest superconducting transition temperature of T C = 84 K. The influence of oxygenation in the electronic states for the Mo 0.3 Cu 0.7 Sr 2 YCu 2 O y system associated with an oxidation reaction leading from a non-superconducting to a superconducting state has also been investigated by means of X-ray photoelectron spectroscopy (XPS). XPS measurements show the predominance of the Mo V oxidation state over the Mo VI one in the AP material; annealing under flowing oxygen enhances both the Mo VI and Cu II amounts. A detailed study of the electronic states for the Mo 0.3 Cu 0.7 Sr 2 YCu 2 O y samples has been performed and is also discussed.

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Superconductivity Enhancement in Fe3O4 Doped YBa2Cu3O7−δ

Xiao

Zhang

et al. 2013

J Supercond Nov Magn

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MoxCu1−xSr2YCu2Oy (0.3≤x≤1) revisited: Superconductivity, magnetism and the molybdenum oxidation state

Cited by 13 publications

References 23 publications

Core-level photoemission spectra of Mo_0.3Cu_0.7Sr₂ErCu₂O_y, a superconducting perovskite derivative. Unconventional structure–property relationships

Core-level photoemission spectra of Mo_0.3Cu_0.7Sr₂ErCu₂O_y, a superconducting perovskite derivative. Unconventional structure–property relationships

1212-Molybdo-Cuprates; effect of oxygenation in the structure, properties and electronic states

Superconductivity Enhancement in Fe3O4 Doped YBa2Cu3O7−δ

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MoxCu1−xSr2YCu2Oy (0.3≤x≤1) revisited: Superconductivity, magnetism and the molybdenum oxidation state

Cited by 13 publications

References 23 publications

Core-level photoemission spectra of Mo0.3Cu0.7Sr2ErCu2Oy, a superconducting perovskite derivative. Unconventional structure–property relationships

Core-level photoemission spectra of Mo0.3Cu0.7Sr2ErCu2Oy, a superconducting perovskite derivative. Unconventional structure–property relationships

1212-Molybdo-Cuprates; effect of oxygenation in the structure, properties and electronic states

Superconductivity Enhancement in Fe3O4 Doped YBa2Cu3O7−δ

Contact Info

Product

Resources

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Core-level photoemission spectra of Mo_0.3Cu_0.7Sr₂ErCu₂O_y, a superconducting perovskite derivative. Unconventional structure–property relationships

Core-level photoemission spectra of Mo_0.3Cu_0.7Sr₂ErCu₂O_y, a superconducting perovskite derivative. Unconventional structure–property relationships