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Effects of oxygen deficiencies on antiferromagnetism and139La-NQR in La2CuO4− y

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Volume
152
Issue
3
Identifiers
DOI: 10.1016/0921-4534(88)90138-4
Disciplines
  • Physics

Abstract

Abstract Nuclear quadropole resonance (NQR) of 139La is investigated in variously oxygenated La 2CuO 4− y . The saturated internal magnetic fields at the La site are invariant against defects of the crystal, suggesting that sublattice moments of Cu spins at the ground state do not change with the amount of oxygen deficiencies. On the contrary, the antiferromagnetic transition temperature, T N, depends on the oxygen deficiencies. In the low temperature region below 70 K, the enhancement of the nuclear relaxation rates, 1/ T 1, is strongly correlated with the decrease of T N.

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