Journal
PHYSICAL REVIEW B
Volume 79, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.092412
Keywords
antiferromagnetism; lithium compounds; magnetic structure; magnetic transitions; magnetoelastic effects; magnetoelectric effects; neutron diffraction; nickel compounds
Funding
- DANSCATT
- Swiss National Science Foundation [PP002-102831, 200020-105175]
- U. S. Department of Energy [DEAC0207CH11358]
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Neutron diffraction is used to probe the (H,T) phase diagram of magnetoelectric (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 k(C)=(0,0,0); the other one is incommensurate (IC) with k(IC)=(0,q,0). At low temperatures the C order collapses above mu H-0=12 T and adopts an IC structure with modulation vector parallel to k(IC). We show that C order is required for the ME effect and establish how electric polarization results from a field-induced reduction in the total magnetoelastic energy.
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