Interlayer effects in high-Tc superconductors

Wheatley, J. M.; Hsu, T. C.; Anderson, Philip W.

doi:10.1038/333121a0

Cited by 172 publications

(86 citation statements)

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“…So far, several mechanisms have been proposed to explain the n dependence of T c . According to the tunneling mechanism of Cooper pairs between the CuO 2 planes, T c,max should increase with increasing n [2]. However if one takes into account the charge imbalance between the planes and the existence of competing order, T c,max takes a maximum at n = 3 [3] in agreement with experiment.…”

Section: Pacs Numbers: Valid Pacs Appear Heresupporting

confidence: 70%

Enhanced Superconducting Gaps in the Trilayer High-TemperatureBi2Sr2Ca2Cu3O10+δ
Ideta
¹
,
Takashima
²
,
Hashimoto
³

et al. 2010
Phys. Rev. Lett.
69
9
50
0
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We have investigated the optimally doped tri-layer cuprate Bi2Sr2Ca2Cu3O 10+δ (Bi2223) by angleresolved photoemission spectroscopy, and observed energy bands and Fermi surfaces originated from the outer and inner CuO2 planes (OP and IP) separately. The OP band is overdoped (hole density ∼ 0.26/Cu) with a large d-wave gap of ∆0 ∼ 43 meV while the IP is underdoped (∼ 0.06/Cu) with an even large gap of ∆0 ∼ 60 meV. We propose that the enhancement of the ∆0 of IP is due to the minimal influence of out-of-plane disorder and that the OP gap is then enhanced through interlayer coupling, most likely a proximity effect from the IP. PACS numbers: Valid PACS appear hereIt has been well known that one of the most efficient ways to increase the critical temperature (T c ) of high-T c cuprate superconductors (HTSCs) is to increase the number of neighboring CuO 2 planes (n). T c generally increases from single-layer (n = 1), double-layer (n = 2), to tri-layer (n = 3) and then decreases for n ≥ 4 [1]. So far, several mechanisms have been proposed to explain the n dependence of T c . According to the tunneling mechanism of Cooper pairs between the CuO 2 planes, T c,max should increase with increasing n [2]. However if one takes into account the charge imbalance between the planes and the existence of competing order, T c,max takes a maximum at n = 3 [3] in agreement with experiment. Meanwhile, T c shows tendency to increase with next-nearest-neighbor Cu-Cu hopping parameter t ′ , which increases with the number of CuO 2 planes [4]. Also, T c increases with decreasing degree of out-of-plane disorder [5,6]. So far, which governs the n dependence of T c,max has been unclear because of the lack of detailed knowledge about the electronic structure of the multi-layer cuprates.In the case of Bi-based HTSCs, the optimum T c (T c,max ) increases from the single-layer Bi 2 Sr 2 CuO 6+δ (Bi2201, T c,max = 35 K), the double-layer Bi 2 Sr 2 CaCu 2 O 8+δ (Bi2212, T c,max = 95 K) to the tri-layer Bi 2 Sr 2 Ca 2 Cu 3 O 10+δ (Bi2223, T c,max = 110 K). Angle-resolved photoemission spectroscopy (ARPES) studies of double-layer Bi2212 [7,8] and four-layer Ba 2 Ca 3 Cu 4 O 8 F 2 (F0234) [10] have revealed the splitting of band dispersions and Fermi surfaces (FSs). In Bi2212, hybridization between the two CuO 2 planes causes splitting into the bonding and anti-bonding bands [7]. The ARPES study on F0234 has indicated band splitting due to the different hole concentrations of the outer CuO 2 planes and the inner CuO 2 planes, and correspondingly two FS sheets have been observed [10].The maximum superconducting (SC) gap was ∼ 60 meV, approximately twice as large as that of the smaller one. On the other hand, previous ARPES results on the tri-layer Bi2223 have not revealed band splitting and multiple FSs [11,12,13]. In the present work, we have successfully observed the band splitting of Bi2223 through a detailed photon-energy dependent study and indicated that the outer CuO 2 plane (OP) and the inner CuO 2 plane (IP) have different doping levels and gap...

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Section: Pacs Numbers: Valid Pacs Appear Heresupporting

confidence: 70%

Enhanced Superconducting Gaps in the Trilayer High-TemperatureBi2Sr2Ca2Cu3O10+δ
Ideta
¹
,
Takashima
²
,
Hashimoto
³

et al. 2010
Phys. Rev. Lett.
69
9
50
0
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“…The crystal chemistry of these oxides shown in numerous studies, are complex and subject to controversy [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. The Ca 2-x Ln x MnO 4 compounds (Ln = Pr, Sm, Gd, Ho) are good examples of Ruddlesden-Popper manganites.…”

Section: Introductionmentioning

confidence: 99%

Magnetic, Electrical Properties and Spin-Glass Effect of Substitution of Ca for Pr in Ca2-xPrxMnO4 Compounds

Tlili¹,

Bejar²,

Dhahri³

et al. 2009

TOSURSJ

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Ca 2-x Pr x MnO 4 (x = 0.000 to 0.200) manganites were synthesized by a sol-gel method and then characterized by X-ray diffraction (XRD) at room temperature. Rietveld refinement technique shows that all samples can be indexed in orthorhombic system except for Ca 2 MnO 4 (x = 0.000) which can be indexed in the tetragonal system. Magnetic and electrical measurements show that magnetization and resistivity have a large dependence of the fractional composition x and temperature. The applied magnetic field has also a large influence on magnetization level. Spin-glass behavior was detected at low temperature for the samples with x 0.175. For all x-values, all compounds exhibit semiconductor behavior and the ferromagnetic (FM) transition temperature T C (Curie temperature) is around 105 K, whatever the applied field.

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“…In hole doped HTS, the low temperature dependence of the in-plane penetration depth λ ab (T ) is linear and doping independent, indicating the presence of nodes in the superconducting energy gap [1,4]. The c-axis penetration depth λ c is a key parameter for some theories describing the mechanism of high temperature superconductivity [5][6][7][8][9][10][11][12][13]. It is sensitive to the electromagnetic anisotropy of the system and has been used to test the pairing symmetry and properties of interlayer dynamics [3,8,9].…”

mentioning

confidence: 99%

Superfluid response in monolayer high-Tccuprates

et al. 2003

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We have studied the doping dependence of the in-plane and out-of-plane superfluid density, ρ s (0), of two monolayer high-Tc superconductors, HgBa2CuO 4+δ and La2−xSrxCuO4, using the low frequency ac-susceptibility and the muon spin relaxation techniques. For both superconductors, ρ s (0) increases rapidly with doping in the under-and optimally doped regime and becomes nearly doping independent above a critical doping, pc ∼ 0.20.

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Interlayer effects in high-Tc superconductors

Cited by 172 publications

References 5 publications

Enhanced Superconducting Gaps in the Trilayer High-TemperatureBi2Sr2Ca2Cu3O10+δ
Ideta
¹
,
Takashima
²
,
Hashimoto
³

et al. 2010
Phys. Rev. Lett.
69
9
50
0
View full text Add to dashboard Cite

Enhanced Superconducting Gaps in the Trilayer High-TemperatureBi2Sr2Ca2Cu3O10+δ
Ideta
¹
,
Takashima
²
,
Hashimoto
³

et al. 2010
Phys. Rev. Lett.
69
9
50
0
View full text Add to dashboard Cite

Magnetic, Electrical Properties and Spin-Glass Effect of Substitution of Ca for Pr in Ca2-xPrxMnO4 Compounds

Superfluid response in monolayer high-Tccuprates

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Interlayer effects in high-Tc superconductors

Cited by 172 publications

References 5 publications

Enhanced Superconducting Gaps in the Trilayer High-TemperatureBi2Sr2Ca2Cu3O10+δIdeta1, Takashima2, Hashimoto3 et al. 2010Phys. Rev. Lett.699500View full textAdd to dashboardCite

Enhanced Superconducting Gaps in the Trilayer High-TemperatureBi2Sr2Ca2Cu3O10+δIdeta1, Takashima2, Hashimoto3 et al. 2010Phys. Rev. Lett.699500View full textAdd to dashboardCite

Magnetic, Electrical Properties and Spin-Glass Effect of Substitution of Ca for Pr in Ca2-xPrxMnO4 Compounds

Superfluid response in monolayer high-Tccuprates

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Enhanced Superconducting Gaps in the Trilayer High-TemperatureBi2Sr2Ca2Cu3O10+δ
Ideta
¹
,
Takashima
²
,
Hashimoto
³

et al. 2010
Phys. Rev. Lett.
69
9
50
0
View full text Add to dashboard Cite

Enhanced Superconducting Gaps in the Trilayer High-TemperatureBi2Sr2Ca2Cu3O10+δ
Ideta
¹
,
Takashima
²
,
Hashimoto
³

et al. 2010
Phys. Rev. Lett.
69
9
50
0
View full text Add to dashboard Cite