Pressure-induced phase transition in ${\mathrm{LaCo}}_{5}$ studied by x-ray emission spectroscopy, x-ray diffraction, and density functional theory

Pressure-induced phase transition in ${LaCo}_{5}$ studied by x-ray emission spectroscopy, x-ray diffraction, and density functional theory

Hitoshi Yamaoka, Yoshiya Yamamoto, Eike F. Schwier, Naohito Tsujii, Masahiro Yoshida, Yu Ohta, Hiroya Sakurai, Jung-Fu Lin, Nozomu Hiraoka, Hirofumi Ishii, Ku-Ding Tsuei, Masashi Arita, Kenya Shimada, and Jun'ichiro Mizuki

Phys. Rev. B 94, 165156 – Published 24 October 2016

Abstract

The pressure dependences of the electronic and crystal structures of ${LaCo}_{5}$ have been studied with high-resolution x-ray absorption spectroscopy (XAS) and x-ray diffraction comprehensively. The lattice constant ratio of $a / c$ shows an anomaly around 12–18 GPa without change in the lattice symmetry. In the XAS spectra with partial fluorescence mode as well as in the integrated absolute difference values of the Co $K β$ emission spectra, a change in the electronic structure was found at around a similar pressure range as the lattice constant anomaly. Density functional theory calculations confirm the presence of a magnetic anomaly around the same pressure region. No temperature dependence of the electronic structure for ${LaCo}_{5}$ and ${YCo}_{5}$ was observed.

Received 29 May 2016
Revised 27 September 2016

DOI:https://doi.org/10.1103/PhysRevB.94.165156

Physics Subject Headings (PhySH)

Crystal structure Pressure effects Quantum phase transitions

Density functional calculations X-ray absorption spectroscopy X-ray diffraction X-ray emission spectroscopy

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Hitoshi Yamaoka¹, Yoshiya Yamamoto², Eike F. Schwier³, Naohito Tsujii⁴, Masahiro Yoshida^2,*, Yu Ohta^2,†, Hiroya Sakurai⁵, Jung-Fu Lin^6,7, Nozomu Hiraoka⁸, Hirofumi Ishii⁸, Ku-Ding Tsuei⁸, Masashi Arita³, Kenya Shimada³, and Jun'ichiro Mizuki²

¹RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
²Graduate School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan
³Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-0046, Japan
⁴International Center for Materials Nanoarchitechtonics, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan
⁵Research Center for Functional Materials, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan
⁶Department of Geological Sciences, The University of Texas at Austin, Austin, Texas 78712, USA
⁷Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
⁸National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan

^*Present address: Institute of Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.
^†Present address: Department of Physics, Osaka University, 1-3 Yamadaoka, Suita 565-0871, Japan.

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Vol. 94, Iss. 16 — 15 October 2016

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Physical Review B

covering condensed matter and materials physics

Pressure-induced phase transition in ${LaCo}_{5}$ studied by x-ray emission spectroscopy, x-ray diffraction, and density functional theory

Hitoshi Yamaoka, Yoshiya Yamamoto, Eike F. Schwier, Naohito Tsujii, Masahiro Yoshida, Yu Ohta, Hiroya Sakurai, Jung-Fu Lin, Nozomu Hiraoka, Hirofumi Ishii, Ku-Ding Tsuei, Masashi Arita, Kenya Shimada, and Jun'ichiro Mizuki

Phys. Rev. B 94, 165156 – Published 24 October 2016

Abstract

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Physical Review B

covering condensed matter and materials physics

Pressure-induced phase transition in LaCo5 studied by x-ray emission spectroscopy, x-ray diffraction, and density functional theory

Hitoshi Yamaoka, Yoshiya Yamamoto, Eike F. Schwier, Naohito Tsujii, Masahiro Yoshida, Yu Ohta, Hiroya Sakurai, Jung-Fu Lin, Nozomu Hiraoka, Hirofumi Ishii, Ku-Ding Tsuei, Masashi Arita, Kenya Shimada, and Jun'ichiro Mizuki

Phys. Rev. B 94, 165156 – Published 24 October 2016

Abstract

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Pressure-induced phase transition in ${LaCo}_{5}$ studied by x-ray emission spectroscopy, x-ray diffraction, and density functional theory