Physics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..899..279s&link_type=abstract
SIXTH INTERNATIONAL CONFERENCE OF THE BALKAN PHYSICAL UNION. AIP Conference Proceedings, Volume 899, pp. 279-280 (2007).
Physics
Magnetic Properties, Y-Based Cuprates, Antiferromagnetics, Diamagnetism, Paramagnetism, And Superparamagnetism
Scientific paper
Using magnetization measurements, we report the existence of an irreversibility in the magnetization in Y0.47Pr0.53Ba2Cu3O7-δ single crystals above the critical temperature (Tc = 13 K) that is visible up to 200 K. Magnetization in temperature displays irreversibility up to an applied field of 500 Oe. We noticed a weak irreversibility at high temperatures and a stronger one at low temperatures. In the weak irreversibility regime, both zero-field- and field-cooled magnetization follow similar Curie-Weiss (C-W) dependences, with slightly different parameters. The C-W parameters, decrease fast with increasing field. The C-W temperature is negative, suggesting that the average interaction between spins is antiferromagnetic. All these data suggest that the paramagnetic state is in fact a free spin liquid containing floating antiferromagnetic clusters as well as superconducting phase fluctuations.
Amasan C. C.
Gyawali P.
Katuwal T.
Maple Brian M.
Sandu V.
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