Temperature dependence of the magnetic penetration depth in the vortex state of the pyrochlore superconductor, Cd2Re2O7

M D Lumsden; S R Dunsiger; J E Sonier; R I Miller; R F Kiefl; R Jin; J He; D Mandrus; S T Bramwell; J S Gardner

doi:10.1103/PhysRevLett.89.147002

Temperature dependence of the magnetic penetration depth in the vortex state of the pyrochlore superconductor, Cd2Re2O7

Phys Rev Lett. 2002 Sep 30;89(14):147002. doi: 10.1103/PhysRevLett.89.147002. Epub 2002 Sep 11.

Authors

M D Lumsden¹, S R Dunsiger, J E Sonier, R I Miller, R F Kiefl, R Jin, J He, D Mandrus, S T Bramwell, J S Gardner

Affiliation

¹ Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.

PMID: 12366067
DOI: 10.1103/PhysRevLett.89.147002

Abstract

We report transverse-field and zero-field muon spin rotation and relaxation studies of the superconducting rhenium oxide pyrochlore, Cd2Re2O7. Transverse-field measurements (H=0.007 T) show line broadening below T(c), which is characteristic of a vortex state, demonstrating conclusively the type-II nature of this superconductor. The penetration depth is seen to level off below about 400 mK (T/T(c) approximately 0.4), with a rather large value of lambda(T=0) approximately 7500 A. The temperature independent behavior below approximately 400 mK is consistent with a nodeless superconducting energy gap. Zero-field measurements indicate no static magnetic fields developing below the transition temperature.