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63Cu NMR in the normal state of HgBa2Ca2Cu3O8+δ (1996)

Julien, M. -H. ; Horvatić, M. ; Berthier, C. ; [et al.]

Springer

Journal of low temperature physics 105 (1996), S. 371-376

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ISSN: 1573-7357

Keywords: 74.25.Nf ; 74.12.Jt ; 76.60.−k

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract We present a63Cu NMR study of HgBa2Ca2Cu3O8+δ underdoped single crystals with Tc ≃ 115 K. While the uniform spin susceptibility decreases below To ≃ 370 K, relaxation rate measurements demonstrate the opening of a spingap at Q = (π, π) below T* ≃ 230 K, the highest temperature reported so far. The characteristic energy of spin fluctuations is shown to be higher than in underdoped YBa2Cu3O7−δ, and the analysis of the quadrupole and hyperfine couplings suggests that the in-plane Cu-O hybridization is also stronger. The T-dependence of T1 is the same in the three CuO2 planes which seems hardly compatible with the pure interlayer spin-pairing picture.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00768414

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