Nodeless superconductivity and the peak effect in the quasiskutterudites Lu3Os4Ge13 and Y3Ru4Ge13
Z. F. Weng, M. Smidman, G. M. Pang, O. Prakash, Y. Chen, Y. J. Zhang, S. Ramakrishnan, H. Q. Yuan
DOI 10.1103/PhysRevB.95.184501 · Physical Review B
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Abstract
We report an investigation of the superconducting states of Lu3Os4Ge13 and Y3Ru4Ge13 single crystals by measurements of the electrical resistivity, ac susceptibility, and London penetration depth. The analysis of the penetration depth and the derived superfluid density indicates the presence of nodeless superconductivity and suggests that there are multiple superconducting gaps in both materials. Furthermore, ac susceptibility measurements of both compounds display the peak effect in the low-temperature region of the H−T phase diagram. This anomalous increase of the critical current with field gives an indication of a change of the arrangement of flux lines in the mixed state, as found in some of the isostructural stannide materials.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Lu3Os4Ge13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.2 | Pressure not reported | midpoint |
| Lu3Os4Ge13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.05 | Pressure not reported | midpoint |
| Y3Ru4Ge13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.8 | Pressure not reported | midpoint |
| Y3Ru4Ge13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.3 | Pressure not reported | midpoint |
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