Giant spin canting in the S=1/2 antiferromagnetic chain [CuPM(NO3)2(H2O)2]n observed by 13C-NMR |
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Authors: | Wolter A U B Wzietek P Süllow S Litterst F J Honecker A Brenig W Feyerherm R Klauss H-H |
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Affiliation: | Institut für Metallphysik und Nukleare Festk?rperphysik, TU Braunschweig, 38106 Braunschweig, Germany. |
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Abstract: | 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. |
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