Giant spin canting in the S=1/2 antiferromagnetic chain [CuPM(NO3)2(H2O)2]n observed by 13C-NMR.
We present a combined experimental and theoretical study on copper pyrimidine dinitrate [CuPM(NO3)2(H2O)2]n, a one-dimensional S=1/2 antiferromagnet with alternating local symmetry. From the local susceptibility measured by NMR at the three inequivalent carbon sites in the pyrimidine molecule we deduce a giant spin canting, i.e., an additional staggered magnetization perpendicular to the applied external field at low temperatures. The magnitude of the transverse magnetization, the spin canting of (52+/-4) degrees at 10 K and 9.3 T, and its temperature dependence are in excellent agreement with exact diagonalization calculations.
Wolter
A U B
AU
Institut für Metallphysik und Nukleare Festkörperphysik, TU Braunschweig, 38106 Braunschweig, Germany.
Wzietek
P
P
Süllow
S
S
Litterst
F J
FJ
Honecker
A
A
Brenig
W
W
Feyerherm
R
R
Klauss
H-H
HH