137 citations · 234 across the 6 of their papers we have counts for
6 papers
Anisotropy of the antiferromagnetic spin correlations in the superconducting state of YBa_2Cu_3O_7 and YBa_2Cu_4O_8
A. Uldry, M. Mali, J. Roos +1
We present evidence that the antiferromagnetic spin correlations in optimally doped YBa_2Cu_3O_7 and underdoped YBa_2Cu_4O_8 develop a surprisingly strong anisotropy in the superco…
Direct observation of the oxygen isotope effect on the in-plane magnetic field penetration depth in optimally doped YBaCuO
R. Khasanov, D. G. Eshchenko, H. Luetkens +8
We report the first direct observation of the oxygen-isotope (O/O) effect on the in-plane penetration depth in a nearly optimally doped YBaCuO$_{7-δ}…
Oxygen Isotope Effect of the Plane-Copper NQR Frequency in YBa_2Cu_4O_8
M. Mali, J. Roos, H. Keller +2
We report on high-precision measurements of the temperature dependence of the plane-^63Cu NQR line frequency nu_Q(Cu2) and the linewidth in normal and superconducting ^16O and ^18O…
^25Mg NMR study of the MgB_2 superconductor
M. Mali, J. Roos, A. Shengelaya +2
^25Mg NMR spectra and nuclear spin-lattice relaxation time, T_1, have been measured in polycrystalline ^25MgB_2 with a superconducting transition temperature T_c = 39.0 K in zero m…
Charge degree of freedom and single-spin fluid model in YBa_2Cu_4O_8
A. Suter, M. Mali, J. Roos +1
We present a 17O nuclear magnetic resonance study in the stoichiometric superconductor YBa_2Cu_4O_8. A double irradiation method enables us to show that, below around 180 K, the sp…
Experimental evidence for fast cluster formation of chain oxygen vacancies in YBa2Cu3O7-d being at the origin of the fishtail anomaly
Andreas Erb, Alfred A. Manuel, Marc Dhalle +13
We report on three different and complementary measurements, namely magnetisation measurements, positron annihilation spectroscopy and NMR measurements, which give evidence that th…