超导PrOs4Sb12中的μ子自旋弛豫与各向同性配对
Muon spin relaxation and isotropic pairing in superconducting PrOs4Sb12.
作者信息
MacLaughlin D E, Sonier J E, Heffner R H, Bernal O O, Young Ben-Li, Rose M S, Morris G D, Bauer E D, Do T D, Maple M B
机构信息
Department of Physics, University of California, Riverside 92521-0413, USA.
出版信息
Phys Rev Lett. 2002 Oct 7;89(15):157001. doi: 10.1103/PhysRevLett.89.157001. Epub 2002 Sep 18.
Transverse-field muon-spin rotation measurements in the vortex-lattice of the heavy-fermion (HF) superconductor PrOs4Sb12 yield a temperature dependence of the magnetic penetration depth lambda indicative of an isotropic or nearly isotropic energy gap. This is not seen to date in any other HF superconductor and is a signature of isotropic pairing symmetry, possibly related to a novel nonmagnetic "quadrupolar Kondo" HF mechanism in PrOs4Sb12. The T=0 relaxation rate sigma(s)(0)=0.91(1) micros(-1) yields an estimated magnetic penetration depth lambda(0)=3440(20) A, which is considerably shorter than in other HF superconductors.
在重费米子（HF）超导体PrOs4Sb12的涡旋晶格中进行的横向场μ子自旋旋转测量，得出了磁穿透深度λ的温度依赖性，这表明能隙是各向同性或近乎各向同性的。迄今为止，在任何其他HF超导体中都未观察到这一点，这是各向同性配对对称性的一个特征，可能与PrOs4Sb12中一种新型的非磁性“四极近藤”HF机制有关。T = 0时的弛豫率σs(0)=0.91(1)微秒−1，得出估计的磁穿透深度λ(0)=3440(20) Å，这比其他HF超导体中的要短得多。
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