Singlet-ground-state paramagnetic centers in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>layers as seen from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Tm</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>169</mm

On, Bakharev; Witteveen, J.; Hb, Brom; Ev, Krjukov; Ob, Marvin; Ma, Teplov

doi:10.1103/physrevb.51.693

Cited by 21 publications

(3 citation statements)

References 12 publications

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“…The occurrence of spin-2 PC's in the CuO 2 planes was predicted theoretically [22] and confirmed experimentally [6] in Tm NMR relaxation measurements on Tm Ba 2 Cu 3 O 72d for d ϳ 0.5. The measurements also showed that n 00 2 was strongly sample dependent [6].…”

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confidence: 58%

“…The measurements also showed that n 00 2 was strongly sample dependent [6]. For lower values of d the relaxation was dominated by spin- The suggestion that nonsuperconducting regions of the samples are associated with PC's was based on the observation that several parameters that might be expected to measure the volume fraction of superconductivity decreased linearly with increases in the concentration of PC's.…”

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confidence: 95%

“…The key to understanding the specific heat of the PC's was provided by NMR [6] and ESR [7] measurements that showed the presence of singlet-ground-state, spin-2 PC's in YBCO and gave the parameters [7] of the spin Hamiltonian. The energy of the first excited doublet, ϳ1 K, is of just the magnitude necessary to account for C͑H͒ at low T and low H. In this Letter, we report specific-heat data that are well represented by an expression that includes contributions from both spin- to the increase in the concentration of O vacancies is only ϳ1͞100.…”

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confidence: 99%

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Specific Heat ofYBa2Cu3O7−δ,
Emerson
¹
,
Wright
²
,
Woodfield
³

et al. 1999
Phys. Rev. Lett.
31
3
7
0
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The concentrations of paramagnetic centers and the values of other parameters, including the Debye temperature and the coefficient of the zero-field, temperature-proportional term, are reported as functions of d. The concentration of paramagnetic centers does increase with increasing d but, in striking contrast with the widely held expectation that the increase would be comparable to the increase in the concentration of O vacancies, it is as much as 2 orders of magnitude smaller. A new expression for the specific heat that takes into account the presence of spin-2 as well as spin-1 2 paramagnetic centers gives an accurate representation of the experimental data. [S0031-9007(99)08491-4]

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confidence: 95%

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confidence: 99%

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