Superconductivity and structural distortion in BaPt$_2$As$_2$

W. B. Jiang; C. Y. Guo; Z. F. Weng; Y. F. Wang; Y. H. Chen; Y. Chen,; G. M. Pang; T. Shang; X. Lu; H. Q. Yuan

arXiv:1409.7859·cond-mat.supr-con·June 23, 2015

Superconductivity and structural distortion in BaPt$_2$As$_2$

W. B. Jiang, C. Y. Guo, Z. F. Weng, Y. F. Wang, Y. H. Chen, Y. Chen,, G. M. Pang, T. Shang, X. Lu, H. Q. Yuan

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TL;DR

This study reports the synthesis and characterization of BaPt$_2$As$_2$, revealing a structural transition likely linked to charge-density-wave order and exhibiting BCS-type superconductivity with two transition temperatures.

Contribution

First synthesis and detailed physical property analysis of BaPt$_2$As$_2$, highlighting its structural transition and superconducting behavior, providing a new platform for studying CDW-superconductivity interplay.

Findings

01

Structural transition at ~275 K linked to CDW

02

Observation of BCS-type superconductivity below 1.7 K

03

Potential for exploring interplay between CDW and superconductivity

Abstract

We successfully synthesized the BaPt $_{2}$ As $_{2}$ single crystals and studied their structural and physical properties at low temperatures. BaPt $_{2}$ As $_{2}$ crystallizes in the CaBe $_{2}$ Ge $_{2}$ -type tetragonal structure (P4/nmm) at room temperature and undergoes a first-order structural transition at $T_{S} ≃ 275$ K, which is likely associated with a charge-density-wave (CDW) instability. BCS-type superconductivity with two subsequent transitions at $T_{c 1} = 1.67$ K and $T_{c 2}$ =1.33K are observed in this compound. Thus, BaPt $_{2}$ As $_{2}$ may serve as a new system for studying the interplay of superconductivity and the CDW order.

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