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Magnetic penetration depth of Tl2Ba2CuO6+δ :T c ∼σ0 in the overdoped region (1994)

Niedermayer, Ch. ; Bernhard, C. ; Binninger, U. ; [et al.]

Springer

Journal of superconductivity 7 (1994), S. 165-168

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ISSN: 1572-9605

Keywords: Muon spin rotation ; magnetic penetration depth ; Tl2Ba2CuO6+δ ; overdoped ; pair breaking

Source: Springer Online Journal Archives 1860-2000

Topics: Electrical Engineering, Measurement and Control Technology , Physics

Notes: Abstract We report transverse-field muon-spin-rotation experiments carried out on Tl2Ba2CuO6+δ . This system spans the whole overdoped regime, andT c is reduced by excess oxygen doping, which increases the normal-state carrier concentration. In the heavily overdoped regimeσ(0) is found to scale linearly with the superconducting critical temperatureT c , similar to the behavior previously observed for other cuprates in the underdoped regime. However, for the overdoped region one has to explain the reduction ofσ 0, thus the increase of the magnetic penetration depthλ, in spite of an increasing normal-state carrier concentration. We discuss some possible explanations for this behavior.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00730388

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Base Catalysed Racemization of Ethylenediamine-N,N,N′-triacetato-aqua-cobalt(III) (1977)

Bernhard, C. A. ; Bernauer, K.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 60 (1977), S. 2371-2378

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ISSN: 0018-019X

Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The kinetics of the base catalysed racemization of [Co(EN3A)H2O]Abbreviations: EN3A3-=(-OOCCH2)2N(CH2)2NHCH2COO-; ME3A3-=(-OOCCH2)2N(CH2)2 N(CH3)CH2COO-; EDDA2-=-OOCCH2NH(CH2)2NHCH2COO-; EDTA4-=(-OOCCH2)2N(CH2)2N(CH2COO-)2;TNTA4-=(-OOCCH2)2N(CH2)3N(CH3COO-)2; HETA3-=(-OOCCH2)2N(CH2)2N(CH2COO-)CH2CH2OH; en=H2N(CH2)2NH2; Meen=H2N(CH2)2NHCH3; sar-=-OOCCH2NHCH3. were studied polarimetrically in aqueous buffer solution. The reaction rate is first order in OH- and in complex, in weakly acidic medium. Activation parameters are ΔH≠=22 kcal · mol-1, ΔS≠=26 cal · K-1. The results are discussed in terms of an SN1CB mechanism involving exchange of the ligand water molecule.The N-methylated analogue [Co(ME3A)H2O] does not racemize in the pH-range investigated. Loss of optical activity occurs at a rate which is about 1,000 times slower than the racemization of [Co(EN3A)H2O](60°) and coincides with the decomposition of the complex.

Additional Material: 6 Ill.