Journal
PHYSICAL REVIEW B
Volume 78, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.214410
Keywords
antiferromagnetic materials; barium compounds; bromine compounds; calcium compounds; copper compounds; crystal structure; frustration; lattice constants; lead compounds; magnetic transitions; magnetisation; materials preparation; solid-state phase transformations; specific heat; strontium compounds; superexchange interactions
Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [19052004, 16076210]
- Global COE program International Center
- Advanced Education in Material Science, Kyoto University, Japan
- JSPS
- NSF [14508500001, DMR-05-02706, DMR-08-06846]
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A 1/3 magnetization plateau was recently observed in the layered perovskite (CuBr)Sr2Nb3O10 with S=1/2 CuBr layers. In order to control the cell size and thus exchange parameters, we have prepared an isostructural series of (CuBr)A(2)B(3)O(10) (A=Ca, Sr, Ba, Pb; B=Nb, Ta) and investigated the magnetic properties. We found that the stability of the 1/3 magnetization plateau is systematically tunable by the lattice parameter a. A substantial role played by the superexchange pathway via BO6-BO6 in the magnetic properties is suggested in addition to that via Br. Specific heat and muon spin relaxation measurements show that the appearance of the plateau phase is accompanied by successive phase transitions in low fields-the first one is possibly a structural transition and the second one is a magnetic transition. Frustration may induce the structural distortion and stabilize the 1/3 plateau phase.
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