Structural phase transitions and superconductivity in the Heusler intermetallics XPd2Sn (X = Ti, Zr, Hf)
Hang Su, Feng Du, Rui Li, Shuaishuai Luo, Yuxuan Chen, Jiyong Liu, Ye Chen, Chao Cao, Michael Smidman, Huiqiu Yuan
DOI 10.1103/PhysRevB.106.134517 · Physical Review B
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Abstract
We report the discovery of structural phase transitions and superconductivity in the full Heusler compounds XPd2Sn (X=Ti, Zr, Hf), by means of electrical transport, magnetic susceptibility, specific heat, and x-ray diffraction measurements. TiPd2Sn, ZrPd2Sn, and HfPd2Sn undergo structural phase transitions from the room-temperature cubic MnCu2Al-type structure (space group Fm3¯m) to a low-temperature tetragonal structure at around 160, 110, and 90 K, respectively, which are likely related to charge density wave (CDW) instabilities. Low-temperature single-crystal x-ray diffraction measurements of ZrPd2Sn demonstrate the emergence of a superstructure with multiple commensurate modulations below Ts. ZrPd2Sn and HfPd2Sn have bulk superconductivity with transition temperatures Tc∼1.2 and 1.3 K, respectively. Density functional theory calculations reveal evidence for structural and electronic instabilities which can give rise to CDW formation, suggesting that these XPd2Sn systems are good candidates for examining the interplay between CDW and superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| ZrPd2Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.2 | Pressure not reported | zero_resistance |
| HfPd2Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.3 | Pressure not reported | unknown |
| YPd2Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.9 | Pressure not reported | unknown |
| LuPt2In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.45 | Pressure not reported | unknown |
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