Spin susceptibility and doping dependence in Tl0.5Pb0.5Sr2Ca1−xYxCu2O7−δ a round the metal-insulator transition 63,65Cu, 207Pb and 205Tl NMR and spin-lattice relaxation

Bogdanovich, A. M.; Zhdanov, Yu. I.; Mikhalyov, K.N.; Lavrentjev, V.V.; Aleksashin, B. A.; Verkovskij, S.V.; Winzek, N.; Gergen, P.; Groß, Joachim; Mehring, M.; Yakubovskii, A.; Shustov, L.D.; Myasoedov, A.B.

doi:10.1016/0921-4534(93)90223-d

Cited by 7 publications

(2 citation statements)

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“…3 where we had to interpolate data points to TABLE I. Summary of materials used for this review 26,[34][35][36][37][38][39][40][41][42][43][44][45][46] . Materials are listed with reference (Ref.…”

Section: Resultsmentioning

confidence: 99%

“…We have excluded data on electron-doped cuprates where 1/T 1 in most cases is affected by rare earth magnetism in the charge reservoir layer, data on antiferromagnetic inner layers in triple and higher layered materials, and data where it was unclear what definition for the T 1 was used 46 . We have also excluded HgBa 2 CuO 4+δ , for which our data are contradictory to results by Gippius et al 43 , as well as Tl 2 Ba 2 CaCu 2 O 8−δ , since 63 T 1⊥ was not actually measured by Gerashenko et al 40 , but deduced from the spin-echo decay.…”

Section: Discussionmentioning

confidence: 99%

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Phenomenology of 63Cu Nuclear Relaxation in Cuprate Superconductors

Jurkutat

Avramovska

Williams

et al. 2019

J Supercond Nov Magn

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Nuclear relaxation is an important thermodynamic probe of electronic excitations, in particular in conducting and superconducting systems. Here, an empirical phenomenology based on all available literature data for planar Cu in hole-doped cuprates is developed. It is found that most of the seemingly different relaxation rates among the systems are due to a temperature independent anisotropy that affects the mostly measured 1/T 1 , the rate with an external magnetic field along the crystal c-axis, while 1/T 1⊥ is largely independent on doping and material above the critical temperature of superconductivity (Tc). This includes very strongly overdoped systems that show Fermi liquid behavior and obey the Korringa law. Below Tc the relaxation rates are similar, as well, if plotted against the reduced temperature T /Tc. Thus, planar Cu nuclear relaxation is governed by a simple, dominant mechanism that couples the nuclei with varying anisotropy to a rather ubiquitous bath of electronic excitations that appear Fermi liquid-like irrespective of doping and family. In particular, there is no significant enhancement of the relaxation due to electronic spin fluctuations, different from earlier conclusions. Only the La2−xSrxCuO4 family appears to be an outlier as additional relaxation is present, however, the anisotropy remains temperature independent. Also systems with very low doping levels, for which there is a lack of data, may behave differently.

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