Hyperfine Interactions in the Heavy-Fermion Superconductor UBe_<13> : ^9Be NMR Studies(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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^9Be NMR measurements have been performed for a single crystal UBe_<13> with T_c≈0.86K. For an applied field parallel to [001] direction, we observed a well-split ^9Be NMR line with the sharp line-width of ≈10 Oe, guaranteeing the high-quality of the single crystal from the microscopic viewpoint. We also calculated the electric field gradient (^9EFG) tensor at Be(II) site using the band-structure calculation based on an FLAPW-LDA method. From the field-angle dependence of ^9Be-NMR spectra together with the result of the band-structure calculation, we identified the ^9EFG and ^9Be Knight shift tensors. The Knight shift of UBe_<13> is enhanced by a factor of hundreds compared to that of a pure Be metal, suggesting the local spin density at Be 2s and 2p orbitals is enhanced through the hybridization with 5f electrons. The isotropic and anisotropic hyperfine fields are obtained as A^<iso>≈436Oe/μB, (A^1_s, A^2_s, A^3_s)≈(192,44, -236) Oe/μB. The anisotropic part can be explained by the spin-dipolar field attributed to the local-spin-density at Be 2p orbital, and the 2p orbital perpendicular to the mirror plane [for example 2p_x for Be (IIA)] contributes mainly to the conduction band. On the other hand, the isotropic part mainly originates from the core polarization hyperfine field of the Be s shell due to the unpaired Be 2p electrons. The present results give direct evidence that the Be 2p orbital is responsible for conduction bands.
- 社団法人日本物理学会の論文
- 2007-02-15
著者
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世良 正文
Department Of Quantum Matter Graduate School Of Advanced Sciences Of Matter Hiroshima University
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TOU Hideki
Department of Quantum Matter, AdSM, Hiroshima University
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SERA Masafumi
Department of Quantum Matter, AdSM, Hiroshima University
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HAGA Yoshinori
Advanced Science Research Center, Japan Atomic Energy Research Institute
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ONUKI Yoshichika
Advanced Science Research Center, Japan Atomic Energy Research Institute
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HARIMA Hisatomo
Department of Physics, Faculty of Science, Kobe University
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Sera Masafumi
Department Of Physics Tohoku University:institute For Molecular Science
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Sera M
Department Of Quantum Matter Graduate School Of Advanced Sciences Of Matter Hiroshima University
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Sera M
Department Of Quantum Matter Adsm Hiroshima University
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Sera Masafumi
Department Of Physics Nagoya University
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Sera Masafumi
Department Of Physics Faculty Of Science Nagoya University
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Okada Yasuaki
Graduate School Of Science Osaka University
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Oda Yasukage
Gradnate School Of Science Osaka University
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Hidaka Hiroyuki
Graduate School Of Natural Science And Technology Okayama University
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Tou Hideki
Department Of Quantum Matter Adsm Hiroshima University:institute For Advanced Materials Research Hir
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Tou Hideki
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Onuki Yoshichika
Institute Of Materials Science The University Of Tsukuba
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Haga Yoshinori
Advanced Science Research Center Japan Atomic Energy Research Institute
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Harada H
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Harima H
Department Of Physics Graduate School Of Science Kobe University
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Harima Hisatomo
Graduate School Of Sciences Kobe University
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Harima Hisatomo
Isir-sanken Osaka University
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Harima Hisatomo
Department Of Condensed Matter Physics The Institute Of Scientific And Industrial Research Osaka Uni
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TSUGAWA Norihiko
Department of Quantum Matter, AdSM, Hiroshima University
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Haba Hiromitsu
Graduate School Of Engineering Nagoya University
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Sera M
Institute Of Materials Structure Science High Energy Accelerator Research Organization (kek)
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Harima Hisatomo
College Of Integrated Arts And Sciences University Of Osaka Prefecture
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Harima Hisatomo
Department Of Physics Kobe University
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Tsugawa Norihiko
Department Of Quantum Matter Adsm Hiroshima University
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Oda Yasukage
The Institute For Solid State Physics University Of Tokyo
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Okuda Yusuke
Gradnate School Of Science Osaka University
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Tou Hideki
Kobe Univ. Kobe
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ONUKI Yoshichika
Advanced Science Research Center, Japan Atomic Energy Agency:Department of Physics, Graduate School of Science, Osaka University
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HAGA Yoshinori
Advance Science Research Center, Japan Atomic Energy Agency
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HARIMA Hisatomo
The Institute of Scientific and Industrial Research, Osaka University
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