Magnetic Structure and Phase Diagram of TmB_4

• Authors: S. Gabáni , S. Maťaš , P. Priputen , K. Flachbart , K. Siemensmeyer , E. Wulf , A. Evdokimova , N. Shitsevalova
• Languages of publication: EN

Abstracts

EN

Magnetic structure of single crystalline TmB_4 has been studied by magnetization, magnetoresistivity, and specific heat measurements. A complex phase diagram with different antiferromagnetic phases was observed below T_{N1}=11.7 K. Besides the plateau at half-saturated magnetization (1/2 M_S), also plateaus at 1/9, 1/8 and 1/7 of M_S were observed as a function of applied magnetic field Bparallel c. From additional neutron scattering experiments on TmB_4, we suppose that these plateaus arise from a stripe structure which appears to be coherent domain boundaries between antiferromagnetic-ordered blocks of 7 or 9 lattice constants. The received results suggest that the frustration among the Tm^{3+} magnetic ions, which maps to a geometrically frustrated Shastry-Sutherland lattice, leads to a strong competition between antiferromagnetic and ferromagnetic order. Thus, stripe structures in intermediate field appear to be the best way to minimize the magnetostatic energy against other magnetic interactions among the Tm ions combined with very strong Ising anisotropy.

Keywords

EN

75.30.Kz; 75.25.+z

Discipline

• 75.30.Kz: Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)(for ferroelectric phase transitions, see 77.80.B-; for superconductivity phase diagrams, see 74.25.Dw)

• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 113
• Issue: 1
• Pages: 227-230

Dates

published

2008-01

received

2007-07-09

Contributors

author

S. Gabáni

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Košice, Slovakia

author

S. Maťaš

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Košice, Slovakia

author

P. Priputen

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Košice, Slovakia

author

K. Flachbart

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Košice, Slovakia

author

K. Siemensmeyer

• Hahn Meitner Institut, Glienicker Str. 100, 14109 Berlin, Germany

author

E. Wulf

• Hahn Meitner Institut, Glienicker Str. 100, 14109 Berlin, Germany

author

A. Evdokimova

• Institute for Problems of Materials Science, Ukrainian Academy of Sciences, Krzhyzhanovsky 3, 03680 Kiev, Ukraine

author

N. Shitsevalova

• Institute for Problems of Materials Science, Ukrainian Academy of Sciences, Krzhyzhanovsky 3, 03680 Kiev, Ukraine

References

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Identifiers

DOI

10.12693/APhysPolA.113.227