Study of the magnetic phase diagram of Y1-x Cax Ba2 Cu3 O6 |
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Authors: | Ch Niedermayer C Bernhard T Blasius A Decker A Golnik |
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Institution: | 1. Fakult?t für Physik, Universit?t Konstanz, D‐78434, Konstanz, Germany 2. Institute of Experimental Physics, Warsaw University, PL‐00–681, Warsaw, Poland
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Abstract: | We have studied the magnetic phase diagram for the bilayer compound Y1-x Cax Ba2 Cu3 O6 in the regime of low doping (hole concentration within a CuO2 plane, psh < 0.1). For psh < 0.03, the data demonstrate the freezing of the spin degrees of freedom associated with the doped holes into a spin‐glass‐like
state which is superimposed on the preexisting long range order of the Cu2+ spins. Only a single spin‐glass like transition at a temperature Tg is observed for samples in the hole concentration range 0.03 < psh < 0.1. While the threshold for the occurrence of superconductivity is almost the same (psh > 0.06) for the Y1-x Cax Ba2 Cu3 O6 and the La2-x Srx CuO4 systems, the magnetic correlations that coexist with superconductivity are considerably stronger in the bilayer Y1-x Cax Ba2 Cu3 O6 system as indicated by significantly increased transition temperatures Tg.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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