Effects of oxygen deficiencies on antiferromagnetism and 139La-NQR in La2CuO4−y

✍ Scribed by Isao Watanabe; Yuki Nakamura; Ken-ichi Kumagai

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 428 KB
• Volume: 152
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(88)90138-4

✦ Synopsis

Nuclear quadrupole resonance (NQR) of '39La is investigated in variously oxygenated La#ZuO,_,, 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 ofoxygen deficiencies. On the contrary, the antiferromagnetic transition temperature, I-,, depends on the oxygen deficiencies. In the low temperature region below 70 K, the enhancement of the nuclear relaxation rates, 1 /T,, is strongly correlated with the decrease of TN.