High-pressure synthesis of the homogeneous infinite-layer superconductor Sr0.9La0.1CuO2

Jung, C. U.; Kim, J.Y.; Lee, S.M.; Kim, M.-S.; Yao, Yuan; Lee, Shin-Yeong; Lee, S.-I.; Ha, Dong-Woo

doi:10.1016/s0921-4534(01)00758-4

Cited by 19 publications

(10 citation statements)

References 11 publications

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“…Prepared at ambient pressure, SrCuO 2 has an orthorhombic structure and contains double chains Cu 2 O 2 of square planar groups sharing edges joined through one rock-salt type SrO layer [4,5]. To obtain the electron-doped superconductor, one first needs to obtain the compound with requiring very high pressure (2-6 GPa) [7,8]. No single crystal has been prepared so far.…”

Section: Introductionmentioning

confidence: 99%

Influence of oxygen reduction on the structural and electronic properties of electron-doped Sr1−xLaxCuO2 thin films

Jovanović

Raffy

et al. 2009

Physica C: Superconductivity

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Single phase, c-axis oriented, e-doped, Sr 1-x La x CuO 2 thin films were epitaxially grown on KTaO 3 and DyScO 3 substrates by reactive rf sputtering. As-grown films being insulating due to oxygen excess, oxygen reduction is necessary to observe superconductivity. Two different procedures were employed to reach superconductivity.On one hand an in-situ reduction process was conducted on a series of films deposited on both types of substrates. On the other hand, an ex-situ reduction procedure was performed sequentially on a single film deposited on DyScO 3 . The study of the influence of oxygen reduction on the structural and electronic properties of the thin films is presented and discussed.

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Section: Introductionmentioning

confidence: 99%

Influence of oxygen reduction on the structural and electronic properties of electron-doped Sr1−xLaxCuO2 thin films

Jovanović

Raffy

et al. 2009

Physica C: Superconductivity

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“…First, in contrast to all other cuprates with a large charge reservoir between the CuO 2 planes, the infinitelayer system only contains a metallic monolayer of La(Sr) between consecutive CuO 2 planes. Second, the c-axis superconducting coherence length (ξ c~0 .53 nm) is longer than the c-axis lattice constant (c 0 ), 51 in contrast to the typical condition of ξ c << c 0 in most other cuprates. Hence, the infinite-layer system is expected to reveal characteristics more like a three-dimensional superconductor.…”

Section: Pairing Symmetry In N-type Cupratesmentioning

confidence: 87%

“…Despite the importance of understanding the infinite-layer cuprates, these materials are very difficult to synthesize, and the lack of single-phased compounds with high volume fraction of superconductivity [48][49][50] has hampered the research until a recent breakthrough. 51 Using high-pressure (~4 GPa) and high-temperature (~2000°C) annealing conditions, Jung et al have been able to routinely achieve single-phased Sr 0.9 Ln 0.1 CuO 2 compounds with nearly~100% superconducting volume. 51 With the availability of these high-quality infinite-layer cuprates, it has finally become possible for us to perform scanning tunneling spectroscopic studies to investigate the quasiparticle tunneling spectra and the pairing symmetry.…”

Section: Evidence Of Strongly Correlated S-wave Superconductivity In mentioning

confidence: 99%

Local and global effects of quantum impurities on the quasi-particle tunneling spectra of p-type and n-type cuprate superconductors

et al. 2002

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Tajima, "Local and global effects of quantum impurities on the quasi particle tunneling spectra of p-type and n-type cuprate superconductors," Proc. SPIE 4811, Superconducting and ABSTRACT We report scanning tunneling spectroscopic studies of the effects of quantum impurities on cuprate superconductors. The samples include p-type YBa 2 Cu 3 O 7−δ single crystals with spinless impurities of Zn 2+ and Mg 2+ ((Zn,Mg)-YBCO) and ntype infinite-layer system Sr 0.9 La 0.1 CuO 2 with 1% magnetic Ni 2+ -or 1% non-magnetic Zn 2+ -impurities that substitute the Cu 2+ in the CuO 2 plane. The local effects of spinless impurities on the quasiparticles spectra of (Zn,Mg)-YBCO are analogous to those of Zn-substituted Bi 2 Sr 2 CaCu 2 O 8+x , and the global effect is manifested by the suppression of the pairing potential ∆ d and of the spin excitation energy. In contrast, spectroscopic studies of Sr 0.9 La 0.1 CuO 2 reveal momentum-independent spectra and superconducting gap ∆ , with (2∆/k B T c )~7 for T c = 43 K and no pseudogap above T c . The global response of Sr 0.9 La 0.1 CuO 2 to quantum impurities is similar to that of s-wave superconductors, being insensitive to small concentrations of spinless impurities (Zn) while showing rapid degradation in T c with increasing magnetic impurities (Ni). Moreover, the spectra of the Ni-substituted Sr 0.9 La 0.1 CuO 2 reveal strong electron-hole asymmetry and long-range impurity effects, in contrast to the localized impurity effects in the p-type cuprates, and the introduction of Zn yield no reduction in either ∆ or T c . The physical implications of these findings are discussed.

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“…The Sr 0:9 La 0:1 CuO 2 and Pr 1:85 Ce 0:15 CuO 4 sample preparation methods are described elsewhere [10,11]. One Sr 0:9 La 0:1 CuO 2 sample was 17 O exchanged at 500°C for 7 days.…”

Section: Experimental Methodsmentioning

confidence: 99%

Charge and spin dynamics in the electron-doped high temperature superconducting cuprates

Williams

Krämer

Dupree

2004

Current Applied Physics

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High-pressure synthesis of the homogeneous infinite-layer superconductor Sr0.9La0.1CuO2

Cited by 19 publications

References 11 publications

Influence of oxygen reduction on the structural and electronic properties of electron-doped Sr1−xLaxCuO2 thin films

Influence of oxygen reduction on the structural and electronic properties of electron-doped Sr1−xLaxCuO2 thin films

Local and global effects of quantum impurities on the quasi-particle tunneling spectra of p-type and n-type cuprate superconductors

Charge and spin dynamics in the electron-doped high temperature superconducting cuprates

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