Low-temperature behavior of two ternary lanthanide nickel carbides: Superconducting LaNiC2 and magnetic CeNiC2
V. K. Pecharsky, L. L. Miller, K. A. Gschneidner, Jr.
DOI 10.1103/PhysRevB.58.497 · Physical Review B
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Abstract
A study of the magnetic properties and the heat capacity as functions of temperature and magnetic field of two ternary carbides RNiC2, where R=La and Ce, confirms that LaNiC2 becomes superconducting at Tc=2.7K, and that CeNiC2 orders antiferromagnetically below 18 K. LaNiC2 is a conventional superconductor with a critical field of 900 Oe at T=2K. CeNiC2 obeys the Curie-Weiss law between 50 and 300 K showing the nearly full Ce3+ magnetic moment, peff=2.47(1)μB, and has a negative paramagnetic Weiss temperature Θp=−18.3(8)K. A low net magnetic moment in the ordered state, which is far from saturation in a magnetic field of 5 T, is consistent with an antiferromagnetic ground state. Below 20 K CeNiC2 shows multiple-step magnetic transitions at 18, 10, and 2.4 K. Both LaNiC2 (in the normal state) and CeNiC2 have the same electronic heat capacity, γ=6.5(2)mJ/molK2, which is typical for many lanthanide-based intermetallic compounds. The Debye temperature of LaNiC2 determined from the heat capacity in the normal state below 5.5 K is ΘD=388(9)K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaNiC2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.7 | Pressure not reported | unknown |
| LaNiC2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.75 | Pressure not reported | onset |
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