J. Phys. IV France
Volume 114, April 2004
Page(s) 147 - 148

J. Phys. IV France
114 (2004) 147
DOI: 10.1051/jp4:2004114035

13C-NMR study of the S = 1/2 antiferromagnetically coupled spin chain compound ${[PM{\cdot}Cu(NO_3)_2{\cdot}(H_2O)_2]_{\textit{n}}}$ under pressure

A.U.B. Wolter1, 2, 1, P. Wzietek1, S. Süllow1, F.J. Litterst1, P. Auban-Senzier2, D. Jérome2, R. Feyerherm3 and H.-H. Klauss1

1  Institut für Metallphysik und Nukleare Festkörperphysik, TU Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, Germany
2  Laboratoire de Physique des Solides, Bât. 510, Université Paris Sud, 91405 Orsay Cedex, France
3  Hahn-Meitner-Institut, 14109 Berlin, Germany

We present an investigation of the S=1/2 antiferromagnetically coupled Heisenberg spin chain [ PM $\cdot$Cu(NO 3) 2 $\cdot$(H 2O) 2] n (PM = pyrimidine = C 4N 2H 4) with field-induced gap by means of 13C-NMR experiments. From the measurements of NMR shift and spin-lattice relaxation rate 1/T 1 we extract the magnetic exchange parameter J/k B and the size of the spin gap $\Delta$ as function of pressure. The observed pressure response is discussed in comparison to related molecular materials. Key words. NMR, hydrostatic pressure, 1-D HAF, field-induced spin gap

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