منابع مشابه
Na Nmr Study of Layered Superconductor Na X Coo 2 · Yh 2 O
We measured 23 Na-NMR spectra and nuclear spin-lattice relaxation rates 23 (1/T1) of superconducting and non-superconducting bilayer hydrate NaxCoO2 · yH2O (x ∼ 0.3, y ∼ 1.3). The central resonance frequency shows a small but various shift due to the difference in the shielding effect by intercalated H2O molecules. The different shielding effect also gives a large difference in the magnitude of...
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متن کاملBaC: a thermodynamically stable layered superconductor.
To predict all stable compounds in the Ba-C system, we perform a comprehensive study using first-principles variable-composition evolutionary algorithm USPEX. We find that at 0 K the well-known compound BaC2 is metastable in the whole pressure range 0-40 GPa, while intercalated graphite phase BaC6 is stable at 0-19 GPa. A hitherto unknown layered orthorhombic Pbam phase of BaC has structure con...
متن کاملC CP / MAS NMR Study of the Layered Compounds
1 3 C C P / M A S N M R spectra were measured on the layered compounds [ C 6 H 5 C H 2 C H 2 N H 3 ] 2 [CH 3 NH 3 ] n _ 1Pb„I 3 n + j (w = 1, 2). The linewidth of the resonance peak corresponding to the phenyl carbons changed with temperature. The maximum broadening took place at 363 K for both compounds. The activation energy £ a for the reorientation of the phenyl group was determined to be 2...
متن کاملSuperconducting properties of the Fe-based layered superconductor LaFeAsO0.9F0.1-delta.
We have employed a new route to synthesize single phase F-doped LaOFeAs compound and confirmed the superconductivity above 20 K in this Fe-based system. We show that the new superconductor has a rather high upper critical field of over 50 T. A clear signature of superconducting gap opening below T(c) was observed in the far-infrared reflectance spectra, with 2Delta/kT(c) approximately 3.5-4.2. ...
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ژورنال
عنوان ژورنال: Physica B: Condensed Matter
سال: 2006
ISSN: 0921-4526
DOI: 10.1016/j.physb.2006.01.317