Competing electronic states under pressure in the double-exchange ferromagnetic 
Peierls system K2Cr8O16

Yamauchi, T.; Hasegawa, K.; Ueda, H.; Isobe, M.; Ueda, Y.

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Competing electronic states under pressure in the double-exchange ferromagnetic Peierls system K₂Cr₈O₁₆

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Isobe, M.
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;
Department Quantum Materials (Hidenori Takagi), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Yamauchi, T., Hasegawa, K., Ueda, H., Isobe, M., & Ueda, Y. (2015). Competing electronic states under pressure in the double-exchange ferromagnetic Peierls system K₂Cr₈O₁₆. Physical Review B, 92(16): 165115.

Cite as: https://hdl.handle.net/21.11116/0000-000E-CC40-4

Abstract

We investigated the pressure effect of Cr4+/Cr3+ mixed-valence chromium oxide K2Cr8O16 using several kinds of high-pressure cells on the ferromagnetic Peierls transition. The resistivity measurements under pressure revealed that the Peierls phase (T-MI = 95 K at 0 GPa) is suppressed but survives even at 13 GPa. Meanwhile, the ferromagnetic phase (T-C = 190 K at 0 GPa) abruptly disappears at a relatively low pressure of 4 GPa. The two phase boundaries between metal/insulator (non-Peierls/Peierls) phases and between ferromagnetic/nonferromagnetic phases seem to cross each other, namely, the four phases seem to meet at a point in the pressure-temperature (P-T) phase diagram. At low temperature (Peierls insulating state), we also found an additional phase near the crossing point. These observations might realize the ground states theoretically predicted in the one-dimensional double-exchange system.