Physical properties of the layered pnictide oxides Na2Ti2P2O (P=As,Sb)
R. H. Liu, D. Tan, Y. A. Song, Q. J. Li, Y. J. Yan, J. J. Ying, Y. L. Xie, X. F. Wang, X. H. Chen
DOI 10.1103/PhysRevB.80.144516 · Physical Review B
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Abstract
The compounds Na2Ti2P2O (P=As,Sb) with anti-K2NiF4 structure were characterized by magnetic susceptibility, magnetoresistance, Hall coefficient (RH), heat capacity, and thermoelectric power (TEP). These compounds exhibit an anomalous transition in resistivity and susceptibility at TS∼320 K for Na2Ti2As2O and TS∼115 K for Na2Ti2Sb2O. The Hall coefficient of Na2Ti2Sb2O shows a pronounced rise below TS, indicating a decrease in carrier density. The sign of TEP changes from positive to negative and magnetoresistance pronounced increase at TS for Na2Ti2Sb2O. Heat capacity shows an anomalous peak at TS∼110 K, a typical behavior for spin-density-wave (SDW)/charge-density-wave instability or a structure distortion. These behaviors of Na2Ti2Sb2O are quite similar to that of FeAs-based high-TC parent compound RFeAsO and AFe2As2 with a SDW instability. Na2Ti2Sb2O could be considered as a possible parent compound for superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xBaxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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