Abstract
NMR shifts and spectra are presented for both Cu(1) and Cu(2) sites in a specimen of (∼60 K). For H along the c axis, the Cu(2) shift is not distinguishable from that reported for . For H in the a-b plane, the spin component of Cu(2) shift declines sharply as T→. The Cu(1) shift behaves similarly, showing also a dramatic broadening at low temperatures in clearly nonmetallic behavior. Combined with anomalous data reported earlier for the 60-K phase of , these results are shown to be consistent with strong and monotonically increasing antiferromagnetic correlations as T is decreased.
- Received 2 January 1990
DOI:https://doi.org/10.1103/PhysRevB.41.9574
©1990 American Physical Society