Stress-induced magnetic textures and fluctuating chiral phase in MnGe chiral magnet

Article

关键词: HIGH-PRESSURE SYNTHESIS;    MNSI;    SKYRMIONS;    TRANSITION;    METALS;   

DOI  :  10.1103/PhysRevB.90.144401

来源: SCIE

【 摘 要 】

We have studied the MnGe chiral magnet below T-N = 170 K, by magnetic measurements, Mossbauer spectroscopy, and by neutron diffraction at ambient and under nonhydrostatic pressure. At ambient pressure, we observe the coexistence of two magnetic phases belonging to the same crystal phase in a large temperature range (down to 100 K) below T-N: ferromagnetically correlated rapidly fluctuating spins coexist with frozen spins involved in the helical order. Applying a uniaxial pressure component induces a strong magnetic texture, where most of the helical axes reorient along the stress axis. The magnetic texture persists in the fluctuating chiral state up to T-N. Our results suggest that the zero field ground state at ambient pressure is a multidomain state consisting of helical domains with random orientations rather than a three-dimensional skyrmion lattice. They show the presence of an unusually broad transition to paramagnetism with a dynamical phase separation triggered by temperature.

【 授权许可】

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