Superconductivity at 93 K in a new mixed-phase Y-Ba-Cu-O compound system at ambient pressure

Wu, Meiying; Ashburn, J. R.; Torng, C. J.; Hor, P. H.; Meng, R. L.; Gao, Li; Huang, Z. J.; Wang, Y. Q.; Chu, C. W.

doi:10.1103/physrevlett.58.908

Cited by 6,678 publications

(1,134 citation statements)

References 7 publications

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“…The strong coupling with optical phonons, unambiguously established in all high-temperature superconductors, transforms holes into lattice mobile polarons and mobile superconducting bipolarons as has been proposed [18,19] prior the discovery [20,21].…”

Section: Introduction: Essential Pairing Interaction In Cupratesmentioning

confidence: 97%

Bose–Einstein condensation of strongly correlated electrons and phonons in cuprate superconductors

Alexandrov

2007

J. Phys.: Condens. Matter

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Section: Introduction: Essential Pairing Interaction In Cupratesmentioning

confidence: 97%

Bose–Einstein condensation of strongly correlated electrons and phonons in cuprate superconductors

Alexandrov

2007

J. Phys.: Condens. Matter

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“…The now‐observed NIR emission clearly cannot be attributed to the typically isolated Mn 2+ ions; however, one possible explanation is given by the occurrence of Mn 2+ ion aggregation. Interionic coupling between transition metal ions often leads to fascinating physical phenomena, such as ferromagnetism in Zn 1– x Mn x Te15 and ZnO:Mn,16 multiferroism in BiFeO 3 thin films,17 superconduction in Y/La–Ba/Sr–Cu–O ceramics,18, 19 and giant magnetoresistance in thin films of La 2/3 Ba 1/3 MnO x 20 and La 0.67 Ca 0.33 MnO x 21. These physical properties are primarily ascribed to the delocalization and interaction of the 3d electrons of transition metal ions.…”

Section: Introductionmentioning

confidence: 99%

Tailored Near‐Infrared Photoemission in Fluoride Perovskites through Activator Aggregation and Super‐Exchange between Divalent Manganese Ions

et al. 2015

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Biomedical imaging and labeling through luminescence microscopy requires materials that are active in the near‐infrared spectral range, i.e., within the transparency window of biological tissue. For this purpose, tailoring of Mn2+–Mn2+ activator aggregation is demonstrated within the ABF3 fluoride perovskites. Such tailoring promotes distinct near‐infrared photoluminescence through antiferromagnetic super‐exchange across effective dimers. The crossover dopant concentrations for the occurrence of Mn2+ interaction within the first and second coordination shells comply well with experimental observations of concentration quenching of photoluminescence from isolated Mn2+ and from Mn2+–Mn2+ effective dimers, respectively. Tailoring of this procedure is achieved via adjusting the Mn–F–Mn angle and the Mn–F distance through substitution of the A+ and/or the B2+ species in the ABF3 compound. Computational simulation and X‐ray absorption spectroscopy are employed to confirm this. The principle is applied to produce pure anti‐Stokes near‐infrared emission within the spectral range of ≈760–830 nm from codoped ABF3:Yb3+,Mn2+ upon excitation with a 976 nm laser diode, challenging the classical viewpoint where Mn2+ is used only for visible photoluminescence: in the present case, intense and tunable near‐infrared emission is generated. This approach is highly promising for future applications in biomedical imaging and labeling.

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“…This discovery ignited an explosion in the field of superconductivity. In later 7-8 years, many other new superconducting systems were discovered, for example the Y Ba 2 Cu 3 O 7−δ (T c ≈ 90K) [5,6], the Bibased systems Bi 2 S rCa 2 CuO 8 (T c ≈ 95K) and Bi 2 S r 2 Ca 2 Cu 3 O 12 (T c ≈ 125K) [7], the Thallium based system [8] and the mercury based system [9] etc. So far the highest superconducting transition temperature, T c =164 K, was discovered in the HgBa 2 Ca 2 Cu 3 O 8+δ under a high pressure of 45 GPa.…”

Section: Unconventional Superconductivity In Cuprates and Iron Pnictimentioning

confidence: 99%

Study on Unconventional Superconductivity after the BCS Paradigm

Wen

2014

Proceedings of the 12th Asia Pacific Physics Conference (APPC12)

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The Bardeen-Cooper-Schrieffer (BCS) theoretical picture has successfully explained the phenomenon of superconductivity in many single element and alloy superconductors. It suggests that the superconductivity is established through quantum condensation of vast number of Copper pairs formed by exchanging phonons between two electrons with opposite momentum and spins near the Fermi energy. This interesting paradigm has dominated the field of superconductivity since 1957. Many superconductors discovered in past three decades, such as the cuprates, iron pnictide/charcogenide and heavy Fermion superconductors seem, however, to violate the BCS picture to some extent. Most of these new superconducting systems seem to get rid of the phonons, instead use the antiferromagnetic spin fluctuations as the pairing gluons. In cuprate superconductors, the origin for the pairing may be even more exotic. In this short report, we will summarize part of these progresses and try to guide readers to possibly new schemes of superconductivity after the BCS paradigm.

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Superconductivity at 93 K in a new mixed-phase Y-Ba-Cu-O compound system at ambient pressure

Abstract: A stable and reproducible superconductivity transition between 80 and 93 K has been unambiguously observed both resistively and magnetically in a new Y-Ba-Cu-0 compound system at ambient pressure. An estimated upper critical field H, 2(0) between 80 and 180 T was obtained.

Cited by 6,678 publications

References 7 publications

Bose–Einstein condensation of strongly correlated electrons and phonons in cuprate superconductors

Bose–Einstein condensation of strongly correlated electrons and phonons in cuprate superconductors

Tailored Near‐Infrared Photoemission in Fluoride Perovskites through Activator Aggregation and Super‐Exchange between Divalent Manganese Ions

Study on Unconventional Superconductivity after the BCS Paradigm

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