Intrinsic paramagnetic centers in 1-2-3 superconductors

Teplov, M. A.; Bakharev, O. N.; Brom, H.B.; Dooglav, A. V.; Egorov, A. V.; Krjukov, E. V.; Marvin, O. B.; Mukhamedshin, I. R.; Naletov, V. V.; Volodin, Andrei; Wagener, D.; Witteveen, J.

doi:10.1007/bf00722818

Cited by 12 publications

(3 citation statements)

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“…This would also explain why there is no simple correlation between n 2 and δ [781]. Teplov, et al [779] have also determined a paramagnetic center density from its effect on Tm spinlattice relaxation. They find that this density is correlated with the fraction of highly-disordered regions in their sample, and is related to f s by Eq.…”

Section: Eprmentioning

confidence: 99%

“…EPR in quenched samples was discussed above. EPR has also been seen in underdoped YBCO, where it has been assumed to be associated with paramagnetic centers on CuO chain fragments [776,779]. In a detailed analysis of the specific heat of YBCO, Phillips and coworkers [231] have attributed the linear term in the specific heat to a sample dependent density n 2 of Cu 2+ moments, which also produce a Schottky anomaly in C v in a magnetic field.…”

Section: Eprmentioning

confidence: 99%

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A survey of the Van Hove scenario for high-tc superconductivity with special emphasis on pseudogaps and striped phases

Markiewicz

1997

Journal of Physics and Chemistry of Solids

371

280

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The Van Hove singularity (VHS) provides a paradigm for the study of the role of peaks in the density of states (dos) on electronic properties. More importantly, it appears to play a major role in the physics of the high-Tc superconductors, particularly since recent photoemission studies have found that the VHS is close to the Fermi level in most of the high-Tc cuprates near the composition of optimum Tc. This paper offers a comprehensive survey of the VHS model, describing both theoretical properties and experimental evidence for the picture. Special topics discussed include a survey of the Fermi surfaces of the cuprates and related compounds, and an analysis of the reliability of the slave boson approach to correlation effects. While many properties of the cuprates can be qualitatively understood by a simple rigid-band-filling model, this is inadequate for more quantitative results, since correlation effects tend to pin the Fermi level near the VHS over an extended doping range, and can lead to a nanoscale phase separation. Furthermore, the peaks in the dos lead to competition from other instabilities, both magnetic and structural (related to charge density waves). A novel form of dynamic structural instability, involving dynamic VHS-Jahn-Teller effects has been predicted. Scattered through the literature, there is considerable experimental evidence for both nanoscale phase separation of holes, and for local, possibly dynamic, structural disorder. This review attempts to gather these results into a comprehensive database, to sort the results, and to see how they fit into the Van Hove scenario. Recent experiments on underdoped cuprates are found to provide a strong confirmation that the pseudogap is driven by a splitting of the VHS degeneracy.

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Section: Eprmentioning

confidence: 99%

Section: Eprmentioning

confidence: 99%

A survey of the Van Hove scenario for high-tc superconductivity with special emphasis on pseudogaps and striped phases

Markiewicz

1997

Journal of Physics and Chemistry of Solids

371

280

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“…3,6 However, the nuclear spin-lattice relaxation rate at low temperatures may be influenced by localized paramagnetic centers that are frequently found in HTSC's. 7 So it would be of interest to repeat such experiments with electron paramagnetic resonance ͑EPR͒ and electron spin-lattice relaxation on electron-spin probes introduced in a HTSC material.…”

mentioning

confidence: 99%

Electron spin-lattice relaxation rate inY(Gd)Ba2Cu4
Ацаркин
¹
,
Демидов
²
,
Vasneva
³

et al. 2000
Phys. Rev. B
10
0
8
0
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Using an original modulation technique, the longitudinal ͑spin-lattice͒ relaxation of the impurity Gd 3ϩ ions has been investigated in the superconducting state of Y 0.99 Gd 0.01 Ba 2 Cu 4 O 8 magnetically aligned powders. The results agree well with the linewidth analysis performed on a single crystal. At low temperatures (TϽ60 K) the relaxation rate T 1Ϫ1 is found to be proportional to T 3 , suggesting d-wave superconducting pairing. The data are consistent with previous Knight shift ( Gd K) measurements that revealed a linear temperature dependence of the uniform spin susceptibility. The Korringa relation between T 1 and Gd K is confirmed indicating the validity of the Fermi-liquid model. RAPID COMMUNICATIONS PRB 61 R14 945 ELECTRON SPIN-LATTICE RELAXATION RATE IN . . . RAPID COMMUNICATIONS R14 946 PRB 61 V. A. ATSARKIN et al.

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5.4.5.1.2 LnBa2Cu3O(x) and LnBa3Cu4O8

Kazei¹,

Krynetskiĭ²

Perovskite-Type Layered Cuprates (High-T(c) Superconductors and Related Compounds)

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Intrinsic paramagnetic centers in 1-2-3 superconductors

Cited by 12 publications

References 11 publications

A survey of the Van Hove scenario for high-tc superconductivity with special emphasis on pseudogaps and striped phases

A survey of the Van Hove scenario for high-tc superconductivity with special emphasis on pseudogaps and striped phases

Electron spin-lattice relaxation rate inY(Gd)Ba2Cu4
Ацаркин
¹
,
Демидов
²
,
Vasneva
³

et al. 2000
Phys. Rev. B
10
0
8
0
View full text Add to dashboard Cite

5.4.5.1.2 LnBa2Cu3O(x) and LnBa3Cu4O8

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Intrinsic paramagnetic centers in 1-2-3 superconductors

Cited by 12 publications

References 11 publications

A survey of the Van Hove scenario for high-tc superconductivity with special emphasis on pseudogaps and striped phases

A survey of the Van Hove scenario for high-tc superconductivity with special emphasis on pseudogaps and striped phases

Electron spin-lattice relaxation rate inY(Gd)Ba2Cu4Ацаркин1, Демидов2, Vasneva3 et al. 2000Phys. Rev. B10080View full textAdd to dashboardCite

5.4.5.1.2 LnBa2Cu3O(x) and LnBa3Cu4O8

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Resources

About

Electron spin-lattice relaxation rate inY(Gd)Ba2Cu4
Ацаркин
¹
,
Демидов
²
,
Vasneva
³

et al. 2000
Phys. Rev. B
10
0
8
0
View full text Add to dashboard Cite