Structural and electronic properties of the ordered double perovskites <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>A</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mi>M</mi><mrow><msub><mrow><mi mathvariant="normal">ReO</mi></mrow><mrow><mn>6</mn></mrow></msub></mrow></math> <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo>(</mo><mi>A</mi></math>=Sr,Ca; <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>M</mi></math>=Mg,Sc,Cr,Mn,Fe,Co,Ni,Zn)

H. Kato; T. Okuda; Y. Okimoto; Y. Tomioka; K. Oikawa; T. Kamiyama; Y. Tokura

doi:10.1103/PhysRevB.69.184412

Structural and electronic properties of the ordered double perovskites $A_{2} M {ReO}_{6}$ $(A$ =Sr,Ca; $M$ =Mg,Sc,Cr,Mn,Fe,Co,Ni,Zn)

H. Kato, T. Okuda, Y. Okimoto, Y. Tomioka, K. Oikawa, T. Kamiyama, and Y. Tokura

Phys. Rev. B 69, 184412 – Published 19 May 2004

Abstract

Structural and electronic properties have been investigated for a series of Re-based ordered double perovskites, $A_{2} M {ReO}_{6}$ $(A$ =Sr,Ca; $M$ =Mg,Sc,Cr,Mn,Fe,Co,Ni,Zn), which contain some prospective candidates of the high-temperature half-metals for future spin-electronic use. Neutron diffraction measurements have revealed the variation of the Re-O bond length with the change of its effective valence states depending on the counter M ion, namely, ${Re}^{6 +}$ - or ${Re}^{5 +}$ -based insulating states, or otherwise mixed-valent metallic (or barely Mott-insulating) states. Magnetotransport and specific heat studies have clarified metal-insulator phenomena for $M$ =Cr and Fe compounds with the change of A site as well as the intergrain tunneling magnetoresistance characteristic of the ceramics of half-metal oxides.

Received 2 December 2003

DOI:https://doi.org/10.1103/PhysRevB.69.184412

Authors & Affiliations

H. Kato^*, T. Okuda^†, Y. Okimoto, and Y. Tomioka

Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8562, Japan

K. Oikawa^‡ and T. Kamiyama

Institute of Materials Structure Science, KEK, Tsukuba 305-0801, Japan

Y. Tokura

Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8562, Japan;
Spin Superstructure Project, ERATO, Japan Science and Technology Corporation (JST), Tsukuba 305-8562, Japan;
Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan

^*Present address: Fuji Electric Advanced Technology Co. Ltd., Hino-city 191-8502, Japan.
^†Present address: Department of Nano-structures and Advanced Materials, Kagosima University, Kagoshima 890-0065, Japan.
^‡Present address: Center for Proton Accelerator Facility, Japan Atomic Energy Research Institute (JAERI), Tokai-mura, Ibaraki-ken 319-1195, Japan.

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Vol. 69, Iss. 18 — 1 May 2004

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