Observation of all-in type tetrahedral displacements in nonmagnetic pyrochlore niobates

S. Torigoe, Y. Ishimoto, Y. Aoishi, H. Murakawa, D. Matsumura, K. Yoshii, Y. Yoneda, Y. Nishihata, K. Kodama, K. Tomiyasu, K. Ikeda, H. Nakao, Y. Nogami, N. Ikeda, T. Otomo, and N. Hanasaki
Phys. Rev. B 93, 085109 – Published 4 February 2016
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Abstract

We observed all-in type Nb tetrahedral displacement in nonmagnetic pyrochlore niobates A2Nb2O7(A=Nd0.5Ca0.5 and Y0.5Ca0.5) through the analysis of the neutron pair distribution function and the extended x-ray absorption function spectroscopy. The all-in type Nb tetrahedral displacement, which has the character of a charge singlet state, is driven by the formation of the bonding orbital. The diffuse scattering in the x-ray diffraction, which has the resonant component in the Nb L3 edge, indicates that the all-in type Nb tetrahedral displacement has the periodicity with its short-range correlation.

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  • Received 8 May 2015
  • Revised 28 December 2015

DOI:https://doi.org/10.1103/PhysRevB.93.085109

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. Torigoe1, Y. Ishimoto2, Y. Aoishi1, H. Murakawa1, D. Matsumura3, K. Yoshii3, Y. Yoneda3, Y. Nishihata3, K. Kodama4, K. Tomiyasu5, K. Ikeda6, H. Nakao6, Y. Nogami2, N. Ikeda2, T. Otomo6, and N. Hanasaki1

  • 1Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
  • 2Department of Physics, Okayama University, Tsushimanaka, Okayama 700-8530, Japan
  • 3Synchrotron Radiation Research Center, Japan Atomic Energy Agency, Hyogo 679-5148, Japan
  • 4Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • 5Department of Physics, Tohoku University, Aoba, Sendai 980-8578, Japan
  • 6Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), oho, Tsukuba, Ibaraki 305-0801, Japan

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Issue

Vol. 93, Iss. 8 — 15 February 2016

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