2007
DOI: 10.1103/physrevlett.98.047002
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Spin Triplet Superconducting State due to Broken Inversion Symmetry inLi2Pt3B

Abstract: We report 11 B and 195 Pt NMR measurements in non-centrosymmetric superconductor Li2Pt3B. We find that the spin susceptibility measured by the Knight shift remains unchanged across the superconducting transition temperature Tc. With decreasing temperature (T ) below Tc, the spinlattice relaxation rate 1/T1 decreases with no coherence peak and is in proportion to T 3 . These results indicate that the Cooper pair is in the spin-triplet state and that there exist line nodes in the superconducting gap function. T… Show more

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Cited by 299 publications
(261 citation statements)
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“…3(c)], which is consistent with the NMR Knight shift measurement for Li 2 Pt 3 B [4,5] within the experimental resolution. Such a large χ s /χ n is obtained near the TTFS of type (A), when the spin-split Fermi surfaces have different effective masses and the Fermi surface of heavy band vanishes.…”
Section: Resultssupporting
confidence: 87%
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“…3(c)], which is consistent with the NMR Knight shift measurement for Li 2 Pt 3 B [4,5] within the experimental resolution. Such a large χ s /χ n is obtained near the TTFS of type (A), when the spin-split Fermi surfaces have different effective masses and the Fermi surface of heavy band vanishes.…”
Section: Resultssupporting
confidence: 87%
“…On the other hand, the Knight shift measurement of Li 2 Pt 3 B did not show such a decrease in spin susceptibility [4,5]. Although the electron correlation effect may enhance the spin susceptibility in the superconducting state [8], such enhancement is unlikely to occur in Li 2 Pd 3 B and Li 2 Pt 3 B in which the correlation effect is negligible [6,7].…”
Section: Introductionmentioning
confidence: 87%
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“…These results indicate that the gap function is isotropic and has components of antiparallel spin pairing. On the other hand, in Li 2 Pt 3 B, the relaxation rate T −1 1 did not exhibit any coherence peak and was proportional to T 3 below T c [14]. These behaviors indicate that the gap function has line nodes.…”
Section: Introductionmentioning
confidence: 88%