A possible new magnetic phase transition in tetragonal RBa₂,Cu₃,O_6+x (R ≡ Nd,Sm,Tm)

H. Gamari-Seale Institute of Material Science, NCSR ‘Demokritos’, 153 10 Ag. Paraskevi, Attiki, Greece

N. Guskos Institute of Material Science, NCSR ‘Demokritos’, 153 10 Ag. Paraskevi, Attiki, Greece; Section of Solid State, Physics Department, Athens University, Panepistimiopolis, 157 71, Zografou, Greece

A. Koufoudakis Institute of Material Science, NCSR ‘Demokritos’, 153 10 Ag. Paraskevi, Attiki, Greece

I. Kruk Institute of Material Science, NCSR ‘Demokritos’, 153 10 Ag. Paraskevi, Attiki, Greece; Institute of Physics, Technical University of Szczecin, Al. Piastow 17, P1-70310, Poland

C. Mitros Institute of Material Science, NCSR ‘Demokritos’, 153 10 Ag. Paraskevi, Attiki, Greece

V. Likodimos Institute of Material Science, NCSR ‘Demokritos’, 153 10 Ag. Paraskevi, Attiki, Greece

N. Niarchos Institute of Material Science, NCSR ‘Demokritos’, 153 10 Ag. Paraskevi, Attiki, Greece

B. Psyharis Institute of Material Science, NCSR ‘Demokritos’, 153 10 Ag. Paraskevi, Attiki, Greece

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Abstract

Electron paramagnetic resonance obtained from the tetragonal RBa₂Cu₃O_6+x (R ≡ Nd, Sm, Tm) compounds exhibit a well defined line resulting from coupled divalent Cu ions. Below 20 K the g parameter of this signal is strongly temperature dependent. At about the same temperatures there is a ferromagnetic-like transition in the magnetic susceptibility.

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A possible new magnetic phase transition in tetragonal RBa₂,Cu₃,O_6+x (R ≡ Nd,Sm,Tm)

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A possible new magnetic phase transition in tetragonal RBa₂,Cu₃,O_6+x (R ≡ Nd,Sm,Tm)