Superconducting and calorimetric properties of ThPt2B2C and the anomalous Tc variation for nonmagnetic RPt2B2C systems (R = Y, Th, La)
F. S. Jeng, Y. B. You, H. C. Ku, J. C. Ho
DOI 10.1103/PhysRevB.53.3492 · Physical Review B
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Abstract
Superconducting quantum interference device dc magnetic susceptibility, ac magnetic susceptibility, ac electrical resistivity, and specific-heat measurements on bulk and powder samples of ThPt2B2C shows a bulk superconducting transition Tc of 7 K with a transition width of 6.6–7.4 K. The low-temperature normal-state specific-heat data yield an electronic-term coefficient γ of 8.5 mJ/mol K2, a Debye temperature θD of 330 K, and a bulk superconducting specific-heat jump ΔC at a Tc of 1.53 γTc. Contrary to the smooth variation of Tc with the T-T in-plane distance for the nonmagnetic RT2B2C systems (R = Y, Th, La; T = Ni, Pd), an anomalous Tc variation with the Pt-Pt in-plane distance d(Pt-Pt) was observed for the nonmagnetic RPt2B2C system (R = Y, Th, La). This anomalous Tc-d(Pt-Pt) relationship, along with the specific-heat γ value and normal-state Pauli paramagnetic susceptibility of lower-Tc ThPt2B2C, suggests the importance of the Pt(5d)-dominated conduction band. © 1996 The American Physical Society.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| ThPt2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | midpoint |
| ThPt2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.4 | Pressure not reported | onset |
| ThPt2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.5 | Pressure not reported | onset |
| ThPt2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | zero_resistance |
| Th0.5Y0.5Pt2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.6 | Pressure not reported | onset |
| Th0.25Y0.75Pt2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.6 | Pressure not reported | onset |
| YPt2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.8 | Pressure not reported | onset |
| Th0.5La0.5Pt2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.8 | Pressure not reported | onset |
| LaPt2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11 | Pressure not reported | onset |
| LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16.6 | Pressure not reported | unknown |
| YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.6 | Pressure not reported | unknown |
| ThNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | unknown |
| YPd2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | Pressure not reported | unknown |
| PrPt2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | onset |
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