Nuclear Magnetic Resonance evidence for correlations between antiferromagnetism and pseudogap effects in Zn- and Ni-doped (Eu, Nd)Ba2Cu3O6+y single crystals (CROSBI ID 541037)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Grafe, Hans-Joachim ; Hammerath, Franziska ; Paar, Dalibor ; Urbanik, G. ; Kataev, V. ; Wolf, Th. ; Khaliullin, G. ; Büchner, B.
engleski
Nuclear Magnetic Resonance evidence for correlations between antiferromagnetism and pseudogap effects in Zn- and Ni-doped (Eu, Nd)Ba2Cu3O6+y single crystals
We present 63, 65Cu Nuclear Quadrupole Resonance (NQR) and 17O Nulcear Magnetic Resonance (NMR) measurements on (Eu, Nd)Ba2(Cu, Ni, Zn)3O6+y single crystals heavily doped with magnetic (Ni) and non-magnetic (Zn) impurities. Owing to the impurity doping only traces of superconductivity are found at low temperatures for both, Ni and Zn doping. Nevertheless, the effect of Ni on the magnetic correlations is completely different from that of the non-magnetic Zn doping. The Ni enhances magnetic correlations and induces a wipeout of both, the copper NQR and oxygen NMR signal comparable to that found in stripe ordered lanthanum cuprates. In contrast, the magnetism is suppressed in the Zn doped samples where no wipeout effect is observed and the nuclear spin lattice relaxation rate of the Cu shows a pseudogap like decrease at low temperatures. Our findings are in a striking correspondence with the different impact of Ni and Zn impurities on the charge pseudogap evidenced by recent optical data, uncovering thereby a close relationship between the magnetic correlations and pseudogap phenomena.
high temperature superconductivity; impurity doping; pseudogap; NMR; NQR
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nije evidentirano
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nije evidentirano
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Podaci o prilogu
19-19.
2008.
objavljeno
Podaci o matičnoj publikaciji
6th INTERNATIONAL CONFERENCE OF THE STRIPES SERIES, Quantum Phenomena in Complex Matter
Bianconi, A
Erice: SUPERSTRIPES-ONLUS and ETTORE MAJORANA FOUNDATION AND CENTRE FOR SCIENTIFIC CULTURE
Podaci o skupu
6th INTERNATIONAL CONFERENCE OF THE STRIPES SERIES, Quantum Phenomena in Complex Matter
predavanje
26.07.2008-01.08.2008
Erice, Italija