Field-induced spin level crossings within a quasi-XY antiferromagnetic state in Ba2FeSi2O7

被引:3
|
作者
Lee, Minseong [1 ]
Schoenemann, Rico [1 ]
Zhang, Hao [2 ,3 ]
Dahlbom, David [3 ]
Jang, Tae-Hwan [4 ]
Do, Seung-Hwan [2 ]
Christianson, Andrew D. [2 ]
Cheong, Sang-Wook [4 ,5 ]
Park, Jae-Hoon [4 ,6 ]
Brosha, Eric [7 ]
Jaime, Marcelo [1 ]
Barros, Kipton [8 ]
Batista, Cristian D. [3 ]
Zapf, Vivien S. [1 ]
机构
[1] Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA
[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
[3] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA
[4] Max Planck POSTECH Korea Res Initiat, MPPHC CPM, Pohang 37673, South Korea
[5] Rutgers State Univ, Rutgers Ctr Emergent Mat, Dept Phys & Astron, Piscataway, NJ 08854 USA
[6] Pohang Univ Sci & Technol, Dept Phys, Pohang 37673, South Korea
[7] Los Alamos Natl Lab, Mat Synth & Integrat, Los Alamos, NM 87545 USA
[8] Los Alamos Natl Lab, Theoret Div, Los Alamos, NM 87545 USA
基金
新加坡国家研究基金会;
关键词
BOSE-EINSTEIN CONDENSATION;
D O I
10.1103/PhysRevB.107.144427
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We present a high-field study of the strongly anisotropic easy-plane square lattice S = 2 quantum magnet Ba2FeSi2O7. This compound is a rare high-spin antiferromagnetic system with very strong easy-plane anisotropy, such that the interplay between spin level crossings and antiferromagnetic order can be studied. We observe a magnetic field-induced spin level crossing occurring within an ordered state. This spin level crossing appears to preserve the magnetic symmetry while producing a nonmonotonic dependence of the order parameter magnitude. The resulting temperature-magnetic field phase diagram exhibits two dome-shaped regions of magnetic order overlapping around 30 T. The ground state of the lower-field dome is predominantly a linear combination of |Sz = 0) and |Sz = 1) states, while the ground state of the higher-field dome can be approximated by a linear combination of |Sz = 1) and |Sz = 2) states. At 30 T, where the spin levels cross, the magnetization exhibits a slanted plateau, the magnetocaloric effect shows a broad hump, and the electric polarization shows a weak slope change. We determined the detailed magnetic phase boundaries and the spin level crossings using measurements of magnetization, electric polarization, and the magnetocaloric effect in pulsed magnetic fields to 60 T. We calculate these properties using a mean-field theory based on direct products of SU(5) coherent states and find good agreement. Finally, we measure and calculate the magnetically induced electric polarization that reflects magnetic ordering and spin level crossings. This multiferroic behavior provides another avenue for detecting phase boundaries and symmetry changes.
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页数:9
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