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arXiv · 2401.00646

High magnetic field phase diagram and weak FM breaking in (Ni0.93Co0.07)3V2O8

Jiating Wu·Minjie Zhang·Ke Shi·Huxin Yin·Yuyan Han·Lansheng Ling·Wei Tong·Chuanying Xi·Li Pi·Zhaosheng Wang
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Abstract

We present magnetostriction and thermal expansion measurements on multiferroic (Ni0.93Co0.07)3V2O8. The high field phase diagrams up to 33 T along the a, b and c directions are built. For H//a, as the magnetic field increases, two intermediate phases appear between the incommensurate phase and the paramagnetic phase at about 7 K, and then a magnetically induced phase appears above the paramagnetic phase. For H//b,thermal expansion measurement indicates a mutation in the spin lattice coupling of the high field phases. The interlaced phase boundary suggests a mixed state in the optical high field phase. For H//c, an intermediate phase between the commensurate phase and the incommensurate phase is detected. A nonlinear boundary between the intermediate phase and the low temperature incommensurate phase, and a clear boundary between the commensurate phase and the paramagnetic phase are found. These results indicate that doping Co2+ breaks the weak ferromagnetic moment of the commensurate phase, which exists in the parent compound Ni3V2O8 and (Ni0.9Co0.1)3V2O8. This nonlinear influence reflects complicated spin modulation in Ni3V2O8 by doping Co2+.

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Jiating Wu, Minjie Zhang, Ke Shi, Huxin Yin, Yuyan Han, Lansheng Ling, Wei Tong, Chuanying Xi, Li Pi, Zhaosheng Wang. 2024-01-01. High magnetic field phase diagram and weak FM breaking in (Ni0.93Co0.07)3V2O8. https://doi.org/10.1103/physrevb.108.214108

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