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The EPR spectrum of the oxygen-deficient Sm 0.5 Er 0.5 Ba 2 Cu 3 O 6+x mixed phase has been investigated in the temperature range of 3.3-20 K. Anomalous behavior of the EPR spectrum has been detected below 4 K that may indicate the presence of magnetic centers with singlet ground state and an excitation energy of the order of 1...
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