Comprehensive magnetic phase diagrams of the polar metal C a3(R u0.95 F e0.05)2 O7

Shiming Lei, Shalinee Chikara, Danilo Puggioni, Jin Peng, Mengze Zhu, Mingqiang Gu, Weiwei Zhao, Yu Wang, Yakun Yuan, Hirofumi Akamatsu, Moses H.W. Chan, Xianglin Ke, Zhiqiang Mao, James M. Rondinelli, Marcelo Jaime, John Singleton, Franziska Weickert, Vivien S. Zapf, Venkatraman Gopalan

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Abstract

Polar metals exist as a rather unique class of materials as they combine two seemingly mutually exclusive properties (polar order and metallicity) in one system. So far only a few polar metals have been unambiguously identified; the magnetic ones are exceptionally rare. Here we investigate a 5% Fe-doped polar metal Ca3Ru2O7, via electrical transport, magnetization, microstrain, and optical second-harmonic generation measurements. We report the full magnetic phase diagrams (in the field-temperature space) for magnetic field Ha and Hb, which exhibit distinct field-dependent magnetizations behavior. In particular, for Ha we found a ferromagnetic incommensurate spin structure, which is absent in the pure Ca3Ru2O7. We propose a microscopic spin model to understand this behavior, highlighting the role of Fe doping in tipping the delicate balance of the underlying exchange-interaction energy in this system.

Original languageEnglish
Article number224411
JournalPhysical Review B
Volume99
Issue number22
DOIs
Publication statusPublished - Jun 10 2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Lei, S., Chikara, S., Puggioni, D., Peng, J., Zhu, M., Gu, M., Zhao, W., Wang, Y., Yuan, Y., Akamatsu, H., Chan, M. H. W., Ke, X., Mao, Z., Rondinelli, J. M., Jaime, M., Singleton, J., Weickert, F., Zapf, V. S., & Gopalan, V. (2019). Comprehensive magnetic phase diagrams of the polar metal C a3(R u0.95 F e0.05)2 O7. Physical Review B, 99(22), [224411]. https://doi.org/10.1103/PhysRevB.99.224411