Doping level dependence of low-frequency spin dynamics in La 2− xBa xCuO 4 studied by Cu-NQR

• Published in: Physica. B, Condensed matter Vol. 281; pp. 920 - 921
• Main Authors: Ikeda, Tomohiko, Matsumura, Masahiro, Yamagata, Hideki, Itoh, Yutaka
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2000
• Subjects: High- Tc cuprates; Metal–insulator transition; NQR; Spin dynamics; Spin gap; Spin dynamics; High- T c cuprates; Metal–insulator transition; NQR; Spin gap
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/S0921-4526(99)01024-8

In order to study the low-frequency spin dynamics in the doped CuO 2 square lattice in La 2− x Ba x CuO 4, the nuclear spin-lattice relaxation time T 1 of 63 Cu was measured up to about 900 K. Overall temperature dependence of ( T 1 T) −1 cannot be represented by a single Curie–Weiss (CW) law. At temperatures higher than a crossover temperature T ∗, (T 1T) −1 obeys the high- T CW law, and is suppressed below T ∗ , following another low- T CW law. The x-dependence of the CW parameters and T ∗ , which is very similar to those for La 2− x Sr x CuO 4, was discussed referring to the current theoretical models.