ACTA

Magnetic Phase Diagram of Tm_0.96Yb_0.04B₁₂ Antiferromagnet with Dynamic Charge Stripes and Yb Valence Instability

A. Azarevich^{a, b}, A. Bogach^{a, c}, S. Demishev^{a, b}, V. Glushkov^{a, b}, N. Shitsevalova^d, V. Filipov^d, S. Gabáni^e, G. Pristas^e, K. Flachbart^e, S. Gavrilkin^f, N. Sluchanko^{a, b}
^aProkhorov General Physics Institute, RAS, Vavilov str. 38, 119991 Moscow, Russia
^bMoscow Institute of Physics and Technology, Institutskiy p.9, Dolgoprudny, Moscow Rg. 141700 Russia
^cNational University of Science and Technology ``MISIS'', Leninskiy pr.4, Moscow, 119049 Russia
^dInstitute for Problems of Materials Science, NASU, Krzhizhanovsky str., 3, 03142, Kyiv, Ukraine
^eInstitute of Experimental Physics SAS, Watsonova 47, 04001 Košice, Slovakia
^fLebedev Physical Institute of RAS, Leninskiy Prospekt 53, 119991 Moscow, Russia

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Detailed studies of magnetoresistance, magnetization and heat capacity have been carried out at helium temperatures for single-domain crystals of antiferromagnetic (AF) metal Tm_0.96Yb_0.04B₁₂ with dynamic charge stripes and Yb valence instability. The results allowed us to construct the angular H-φ-T magnetic phase diagram in the form of a ``Maltese cross''. It was shown that the dramatic symmetry lowering in the AF ground state of this dodecaboride with fcc crystal structure could be attributed to the spin density redistribution of conduction electrons from the RKKY oscillations to dynamic charge stripes, which modify significantly the indirect exchange interaction between magnetic moments of Tm³⁺ ions, and result in appearance of a number of various magnetic phases and phase transitions. Doping with Yb strongly suppresses the AF long-range order which works upon the AF-paramagnet phase boundaries.

DOI:10.12693/APhysPolA.137.788
topics: Maltese Cross anisotropy, Dynamic charge stripes