Chiral and helical phase transitions in quasi-1D molecular magnets

Anno: 2005

Autori: Cinti F., Affronte M., Lascialfari A., Barucci M., Olivieri E., Pasca E., Rettori A., Risegari L., Ventura G., Pini M.G., Cuccoli A., Roscilde T., Caneschi A., Gatteschi D., Rovai D.

Affiliazione autori: INFM and Dipartimento di Fisica, Università di Firenze, via Sansone, I, I-50019 Sesto Fiorentino (FI), Italy; INFM – S3 National Research Center, Università di Modena, I-41100 Modena, Italy; INFM and Dipartimento di Fisica, Università di Pavia, I-27100 Pavia, Italy; Istituto dei Sistemi Complessi, Sezione di Firenze, CNR, I-50019 Sesto Fiorentino (FI), Italy; University of Southern California, Dept. of Physics, Los Angeles, CA 90089-0484, United States; INSTM and Dipartimento di Chimica, Università di Firenze, I-50019 Sesto Fiorentino, Italy

Abstract: We review recent experimental data obtained with quasi-one-dimensional (1D) molecular magnets Gd(hfac)3NITR. For Gd(hfac)3NITiPr the results can be coherently explained only in terms of the Villain\’s conjecture: a chiral order at intermediate temperatures and helical order at low temperatures. In the case of weakly frustrated molecular magnetic chain compounds Gd(hfac)3NITPh, new specific heat measurements show the presence of a phase transition to the three-dimensional (3D) helical order, observed at T ~ 0.63 K. In the temperature range 25-250 mK the experimental specific heat data are reproduced very well by a simple spin wave theory.

Giornale/Rivista: POLYHEDRON

Volume: 24 (16-17)      Da Pagina: 2568  A: 2572

Parole chiavi: Chiral and helical order; Low-dimensional systems; Molecular magnets; Phase transitions; Specific heat measurements; Spin waves
DOI: 10.1016/j.poly.2005.03.124

Citazioni: 5
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-05-18
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