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- W2321861602 abstract "We report on $^{139}mathrm{La}$ and $^{13}mathrm{C}$ nuclear magnetic resonance (NMR) study of noncentrosymmetric superconductor ${mathrm{La}}_{2}{mathrm{C}}_{3}$ with superconducting critical temperature ${T}_{mathrm{c}}=11.8$ K. In the normal state $^{139}mathrm{La}$ NMR spectra show a characteristic quadrupole polycrystalline broadening yielding a quadrupole frequency ${ensuremath{nu}}_{mathrm{Q}}phantom{rule{0.16em}{0ex}}=phantom{rule{0.16em}{0ex}}3.1$ MHz and a very large shift of $ensuremath{sim}3000$ ppm. A significant part of this shift arises from the Van Vleck-like susceptibility as a result of a sizable spin-orbit coupling. In the superconducting phase ${mathrm{La}}_{2}{mathrm{C}}_{3}$ shows abnormal behavior that dramatically deviates from the conventional $s$-wave superconductors. Namely, (i) $^{139}mathrm{La}$ and $^{13}mathrm{C}$ NMR shifts in the superconducting state do not change from their normal-state values, and (ii) the $^{139}mathrm{La}$ spin-lattice relaxation rate is strongly enhanced below ${T}_{mathrm{c}}$. Such unconventional response in the local static and dynamic spin susceptibilities is discussed in terms of possible mixture of spin-singlet and spin-triplet Cooper pairs, which is promoted by the asymmetric spin-orbit coupling in the system without the center of inversion." @default.
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- W2321861602 date "2014-09-11" @default.
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- W2321861602 title "Anomalous local spin susceptibilities in noncentrosymmetric<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>La</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>C</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>superconductor" @default.
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- W2321861602 doi "https://doi.org/10.1103/physrevb.90.104507" @default.
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