NMR and NQR Studies of Magnetism and Superconductivity in the Antiferromagnetic Heavy Fermion Superconductors UM_2Al_3 (M=Ni and Pd)
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概要
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Both magnetic and superconducting characteristics of the new heavy fermion superconductors (HFS), UNi_2Al_3 and UPd_2Al_3 have been investigated extensively by means of ^27Al NMR and NQR. Systematic studies of the nuclear-spin-lattice relaxation time T_1, the Knight shift and the spectrum of ^27Al have revealed different types of magnetic fluctuations and spin structure between these two compounds. UNi_2Al_3 shows a band-type itinerant antiferromagnetic behavior, while UPd_2Al_3 belongs to a heavy fermion antiferromagnet with an ordinary size of U-derived moment. In the superconducting state, the relaxation behavior in UPd_2Al_3 is similar to those observed in the other HFS reported so far, providing an evidence for an unconventional anisotropic superconductivity with line of gap zeros on the Fermi surface as well. Knight shift has been found to decrease considerably below T_C, showing that the pseudo spin is well defined, not affected by the impurity scattering.
- 社団法人日本物理学会の論文
- 1993-11-15
著者
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KITAOKA Yoshio
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit
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Geibel Christoph
Max-planck Institute For Chemical Physics Of Solids
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Asayama Kunisuke
Department of Material Physics, Faculty of Engineering Science, Osaka University
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Asayama Kunisuke
Department Of Physical Science Graduate School Of Engineering Science Osaka University
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Asayama Kunisuke
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Geibel C
Max‐planck Inst. Chemical Physics Of Solids Dresden Deu
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Steglich F
Max-planck Institute For Chemical Physics Of Solids
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KYOGAKU Masafumi
Department of Material Physics,Faculty of Engineering Science,Osaka University
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Karaki Y
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Kitaoka Yoshio
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Geibel Christoph
Institute fur Festkorperphysik, Technishe Hochschule, Darmstadt
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Schank Christina
Institute fur Festkorperphysik, Technishe Hochschule, Darmstadt
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Steglich Frank
Institute fur Festkorperphysik, Technishe Hochschule, Darmstadt
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Steglich Frank
Institut Fur Festkorperphysik Technische Hochschule
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Kyogaku Masafumi
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Schank Christina
Institute Fur Festkorperphysik Technishe Hochschule Darmstadt
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