Effects of disorder and hydrostatic pressure on charge density wave and superconductivity in 2H-TaS2

doi:10.1103/PhysRevB.103.224509

	Effects of disorder and hydrostatic pressure on charge density wave and superconductivity in 2H-TaS2
	Xu, Shuxiang 9,10,11; Gao, Jingjing 4,12; Liu, Ziyi 9,10; Chen, Keyu 9,10,11; Yang, Pengtao 9,10; Tian, Shangjie 5,6; Gong, Chunsheng 5,6; Sun, Jianping 9,10,11; Xue, Mianqi 7; Gouchi, Jun 1
刊名	PHYSICAL REVIEW B
	2021-06-04
卷号	103
ISSN号	2469-9950
DOI	10.1103/PhysRevB.103.224509
通讯作者	Luo, Xuan(xluo@issp.ac.cn) ; Lei, Hechang(hlei@ruc.edu.cn) ; Wang, Bosen(bswang@iphy.ac.cn)
英文摘要	We report the comparative effects of disorder and hydrostatic pressure on charge density wave (CDW) and superconductivity (SC) in 2H-TaS2 by measuring electrical resistivity and ac magnetic susceptibility. For the crystals in the clean limit (low disorder level), CDW ground state is suppressed completely at a critical pressure P-c similar to 6.24(5) GPa where a dome-shaped pressure dependence of superconducting transition temperature T-c(P) appears with a maximum value of T-c(max) similar to 9.15 K, indicating strong competitions between CDW and SC. The temperature exponent n of low-temperature resistivity data decreases from similar to 3.36 at ambient pressure (AP) to similar to 1.29(2) at P-c and then retains a saturated value similar to 2.10(4) when the pressure is higher than 7.5 GPa; accordingly, the quadratic temperature coefficient of normal-state resistivity A peaks out just at P-c with an enhancement by nearly one order in magnitude. These features strongly manifest that the enhanced critical CDW fluctuations near P-c are possible important glues for superconducting pairings. High-pressure magnetic susceptibility indicates that superconducting shielding volume increases with pressure and retains a nearly constant value above P-c, which evidences that the enhancement of T-c(P) is accompanied by the expense of CDW. For those crystals in dirty limit (high disorder level), there is no clear CDW phase transition in resistivity; the pressure dependence of T-c(P) and n broadens up and becomes less apparent in comparison with the clean crystals. Our results suggest that disorder scattering and the melting of CDW are two factors affecting SC, and the melting of CDW dominates the change of T-c below P-c; the enhancement of T-c(P) is associated with the suppression of CDW by pressure and the increase in the density of states at Fermi level; however, after the CDW collapse, superconducting pairing strength is strongly weakened by impurity scattering above P-c according to Anderson's theorem.
资助项目	Beijing Natural Science Foundation[Z190008] ; Beijing Natural Science Foundation[Z200005] ; Key Research Program of Frontier Sciences of Chinese Academy of Sciences[XDB25000000] ; Key Research Program of Frontier Sciences of Chinese Academy of Sciences[XDB33000000] ; Key Research Program of Frontier Sciences of Chinese Academy of Sciences[QYZDB-SSWSLH013] ; National Key Research and Development Program of China[2016YFA0300404] ; National Key Research and Development Program of China[2018YFA0305700] ; National Key Research and Development Program of China[2018YFA0305800] ; National Key Research and Development Program of China[2018YFE0202600] ; National Key Research and Development Program of China[2016YFA0300504] ; National Natural Science Foundation of China[11921004] ; National Natural Science Foundation of China[11834016] ; National Natural Science Foundation of China[11874400] ; National Natural Science Foundation of China[11574377] ; National Natural Science Foundation of China[51171177] ; National Natural Science Foundation of China[11674326] ; National Natural Science Foundation of China[11874357] ; National Natural Science Foundation of China[11774423] ; National Natural Science Foundation of China[11822412] ; National Natural Science Foundation of China[U1832141] ; National Natural Science Foundation of China[U1932217] ; Fundamental Research Funds for the Central Universities ; Research Funds of Renmin University of China[18XNLG14] ; Research Funds of Renmin University of China[19XNLG17] ; Research Funds of Renmin Univeristy of China[20XNH062] ; Outstanding Innovative Talents Cultivation Funded Programs 2020 of Renmin University Of China ; Chinese Academy of Sciences Large-Scale Scientific Facility[U1832141] ; Chinese Academy of Sciences Large-Scale Scientific Facility[U1932217] ; Key Research Program of Frontier Sciences, CAS[QYZDB-SSW-SLH015] ; Excellence and Scientific Research Grant of Hefei Science Center of CAS[2018HSC-UE011] ; IOP Hundred-Talent Program[Y7K5031X61] ; Youth Promotion Association of CAS[2018010] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB25000000] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB33000000] ; Strategic Priority Research Program of Chinese Academy of Sciences[QYZDB-SSWSLH013]
WOS研究方向	Materials Science ; Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000661497100003
资助机构	Beijing Natural Science Foundation ; Key Research Program of Frontier Sciences of Chinese Academy of Sciences ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Research Funds of Renmin University of China ; Research Funds of Renmin Univeristy of China ; Outstanding Innovative Talents Cultivation Funded Programs 2020 of Renmin University Of China ; Chinese Academy of Sciences Large-Scale Scientific Facility ; Key Research Program of Frontier Sciences, CAS ; Excellence and Scientific Research Grant of Hefei Science Center of CAS ; IOP Hundred-Talent Program ; Youth Promotion Association of CAS ; Strategic Priority Research Program of Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/123875]
专题	中国科学院合肥物质科学研究院
通讯作者	Luo, Xuan; Lei, Hechang; Wang, Bosen
作者单位	1.Univ Tokyo, Inst Solid State Phys, Kashiwanoha 5-1-5, Kashiwa, Chiba 2778581, Japan 2.Songshan Lake Mat Lab, Dongguan 523808, Guangdong, Peoples R China 3.Nanjing Univ, Collaborat Innovat Ctr Microstruct, Nanjing 210093, Peoples R China 4.Univ Sci & Technol China, Grad Sch, Sci Isl Branch, Hefei 230026, Peoples R China 5.Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China 6.Renmin Univ China, Beijing Key Lab Optoelect Funct Mat & Micronano D, Beijing 100872, Peoples R China 7.Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China 8.Chinese Acad Sci, High Magnet Field Lab, Hefei 230031, Peoples R China 9.Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China 10.Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Xu, Shuxiang,Gao, Jingjing,Liu, Ziyi,et al. Effects of disorder and hydrostatic pressure on charge density wave and superconductivity in 2H-TaS2[J]. PHYSICAL REVIEW B,2021,103.
APA	Xu, Shuxiang.,Gao, Jingjing.,Liu, Ziyi.,Chen, Keyu.,Yang, Pengtao.,...&Cheng, Jinguang.(2021).Effects of disorder and hydrostatic pressure on charge density wave and superconductivity in 2H-TaS2.PHYSICAL REVIEW B,103.
MLA	Xu, Shuxiang,et al."Effects of disorder and hydrostatic pressure on charge density wave and superconductivity in 2H-TaS2".PHYSICAL REVIEW B 103(2021).