Field-induced magnetic phases and electric polarization in LiNiPO4

Autor:	Jensen, T. B. S., Christensen, N. B., Kenzelmann, M., Rønnow, H. M., Niedermayer, C., Andersen, N. H., Lefmann, K., Schefer, J., Zimmermann, M. v., Li, J., Zarestky, J. L., Vaknin, D.
Rok vydání:	2009
Předmět:	Condensed Matter - Materials Science Condensed Matter - Strongly Correlated Electrons
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.79.092412
Popis:	Neutron diffraction is used to probe the (H,T) phase diagram of magneto-electric (ME) LiNiPO4 for magnetic fields along the c-axis. At zero field the Ni spins order in two antiferromagnetic phases. One has commensurate (C) structures and general ordering vectors (0,0,0), the other one is incommensurate (IC) with ordering vector (0,q,0). At low temperatures the C order collapses above 12 Tesla and adopts an IC structure with modulation vector parallel to (0,q,0). We show that C order is required for the ME effect and establish how electric polarization results from a field-induced reduction of the total magneto-elastic energy. Comment: 5 pages, 4 figures, accepted for publication in Phys. Rev. B
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0901.2238 Zobrazit plný text záznamu View this record from Arxiv