Anomalous behavior of the quasi-one-dimensional quantum material Na2OsO4 at high pressure

Sereika, Raimundas; Yamaura, K.; Jia, Y.; Zhang, S.; Jin, C.; Yoon, H.; Jeong, M. Y.; Han, M. J.; Brewe, D. L.; Heald, S. M.; Sinogeikin, S.; Ding, Yang; Mao, H. -k.

doi:10.1016/j.mtphys.2018.12.001

Title: Anomalous behavior of the quasi-one-dimensional quantum material Na₂OsO₄ at high pressure

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Abstract

Na₂OsO₄ is an unusual quantum material that, in contrast to the common 5d² oxides with spins = 1, owns a magnetically silent ground state with spin = 0 and a band gap at Fermi level attributed to a distortion in the OsO₆ octahedral sites. In this semiconductor, our low-temperature electrical transport measurements indicate an anomaly at 6.3 K with a power-law behavior inclining through the semiconductor-to-metal transition observed at 23 GPa. Even more peculiarly, we discover that before this transition, the material becomes more insulating instead of merely turning into a metal according to the conventional wisdom. Furthermore, to investigate the underlying mechanisms, we applied experimental and theoretical methods to examine the electronic and crystal structures comprehensively, and conclude that the enhanced insulating state at high pressure originates from the enlarged distortion of the OsO₆. It is such a distortion that widens the band gap and decreases the electron occupancy in Os’s t_{2_g} orbital through an interplay of the lattice, charge, and orbital in the material, which is responsible for the changes observed in our experiments.

Authors:

Sereika, Raimundas ^[1]; Yamaura, K. ^[2]; Jia, Y. ^[3]; Zhang, S. ^[3]; Jin, C. ^[4]; Yoon, H. ^[5]; Jeong, M. Y. ^[5]; Han, M. J. ^[6]; Brewe, D. L. ^[7];

^[7]; Sinogeikin, S. ^[8]; Ding, Yang ^[1]; Mao, H. -k. ^[9]

Center for High Pressure Science and Technology Advanced Research, Beijing (China)
National Inst. of Materials Science, Ibaraki (Japan)
Chinese Academy of Sciences (CAS), Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
KAIST, Daejeon (Republic of Korea)
KAIST, Daejeon (Republic of Korea); Korea Advanced Institute of Science and Technology, Daejeon (Republic of Korea)
Argonne National Lab. (ANL), Argonne, IL (United States)
Carnegie Inst. of Washington, Washington, DC (United States); DACTools LLC, Naperville, IL (United States)
Center for High Pressure Science and Technology Advanced Research, Beijing (China); Carnegie Inst. of Washington, Washington, DC (United States)

Publication Date:: 2019-02-20

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); National Key Research and Development Program of China

OSTI Identifier:: 1496213

Alternate Identifier(s):: OSTI ID: 1637245

Grant/Contract Number:: AC02-06CH11357; NA0001974; FG02-94ER14466; FG02-99ER45775; U1530402

Resource Type:: Accepted Manuscript

Journal Name:: Materials Today Physics

Additional Journal Information:: Journal Volume: 8; Journal Issue: C; Journal ID: ISSN 2542-5293

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; DFT; Fermi liquid; Octahedral distortion; Resistance; XAS; XRD

Citation Formats


                    Sereika, Raimundas, Yamaura, K., Jia, Y., Zhang, S., Jin, C., Yoon, H., Jeong, M. Y., Han, M. J., Brewe, D. L., Heald, S. M., Sinogeikin, S., Ding, Yang, and Mao, H. -k. Anomalous behavior of the quasi-one-dimensional quantum material Na2OsO4 at high pressure.  United States: N. p., 2019. 
Web.  https://doi.org/10.1016/j.mtphys.2018.12.001.

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                    Sereika, Raimundas, Yamaura, K., Jia, Y., Zhang, S., Jin, C., Yoon, H., Jeong, M. Y., Han, M. J., Brewe, D. L., Heald, S. M., Sinogeikin, S., Ding, Yang, & Mao, H. -k. Anomalous behavior of the quasi-one-dimensional quantum material Na2OsO4 at high pressure.  United States.  https://doi.org/10.1016/j.mtphys.2018.12.001

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                    Sereika, Raimundas, Yamaura, K., Jia, Y., Zhang, S., Jin, C., Yoon, H., Jeong, M. Y., Han, M. J., Brewe, D. L., Heald, S. M., Sinogeikin, S., Ding, Yang, and Mao, H. -k. Wed .  
"Anomalous behavior of the quasi-one-dimensional quantum material Na2OsO4 at high pressure".  United States.  https://doi.org/10.1016/j.mtphys.2018.12.001.  https://www.osti.gov/servlets/purl/1496213.

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@article{osti_1496213,

  title        = {Anomalous behavior of the quasi-one-dimensional quantum material Na2OsO4 at high pressure},

  author       = {Sereika, Raimundas and Yamaura, K. and Jia, Y. and Zhang, S. and Jin, C. and Yoon, H. and Jeong, M. Y. and Han, M. J. and Brewe, D. L. and Heald, S. M. and Sinogeikin, S. and Ding, Yang and Mao, H. -k.},

  abstractNote = {Na2OsO4 is an unusual quantum material that, in contrast to the common 5d2 oxides with spins = 1, owns a magnetically silent ground state with spin = 0 and a band gap at Fermi level attributed to a distortion in the OsO6 octahedral sites. In this semiconductor, our low-temperature electrical transport measurements indicate an anomaly at 6.3 K with a power-law behavior inclining through the semiconductor-to-metal transition observed at 23 GPa. Even more peculiarly, we discover that before this transition, the material becomes more insulating instead of merely turning into a metal according to the conventional wisdom. Furthermore, to investigate the underlying mechanisms, we applied experimental and theoretical methods to examine the electronic and crystal structures comprehensively, and conclude that the enhanced insulating state at high pressure originates from the enlarged distortion of the OsO6. It is such a distortion that widens the band gap and decreases the electron occupancy in Os’s t2g orbital through an interplay of the lattice, charge, and orbital in the material, which is responsible for the changes observed in our experiments.},

  doi          = {10.1016/j.mtphys.2018.12.001},

  journal      = {Materials Today Physics},

  number       = C,

  volume       = 8,

  place        = {United States},

  year         = {2019},

  month        = {2}

}

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Title: Anomalous behavior of the quasi-one-dimensional quantum material Na2OsO4 at high pressure

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Title: Anomalous behavior of the quasi-one-dimensional quantum material Na₂OsO₄ at high pressure