Suppression of superconductivity in LuxZr1−xB12: Evidence of static magnetic moments induced by nonmagnetic impurities
N. E. Sluchanko, A. N. Azarevich, M. A. Anisimov, A. V. Bogach, S. Yu. Gavrilkin, M. I. Gilmanov, V. V. Glushkov, S. V. Demishev, A. L. Khoroshilov, A. V. Dukhnenko, K. V. Mitsen, N. Yu. Shitsevalova, V. B. Filippov, V. V. Voronov, K. Flachbart
DOI 10.1103/PhysRevB.93.085130 · Physical Review B
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Abstract
Based on low-temperature resistivity, heat capacity, and magnetization investigations, we show that the unusually strong suppression of superconductivity in LuxZr1−xB12 (x<8%) BCS-type superconductors is caused by the emergence of static spin polarization in the vicinity of nonmagnetic lutetium impurities. The analysis of the obtained results points to a formation of static magnetic moments with μeff≈6μB per Lu3+ ion (1S0 ground state, 4f14 configuration) incorporated in the superconducting ZrB12 matrix. The size of these spin-polarized nanodomains was estimated to be about 5 Å.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LuxZr1-xB12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | midpoint |
| LuxZr1-xB12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | midpoint |
| LuxZr1-xB12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | midpoint |
| ZrB12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | unknown |
| LuB12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.4 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
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