Elastoresistance measurements on CaKFe4As4 and KCa2Fe4As4F2 with the Fe site of C2v symmetry

被引：15

作者：

Terashima, Taichi ^{[1
]}

Matsushita, Yoshitaka ^{[2
]}

Yamase, Hiroyuki ^{[1
]}

Kikugawa, Naoki ^{[3
]}

Abe, Hideki ^{[3
]}

Imai, Motoharu ^{[4
]}

Uji, Shinya ^{[4
]}

Ishida, Shigeyuki ^{[5
]}

Eisaki, Hiroshi ^{[5
]}

Iyo, Akira ^{[5
]}

Kihou, Kunihiro ^{[5
]}

Lee, Chul-Ho ^{[5
]}

Wang, Teng ^{[6
,7
]}

Mu, Gang ^{[6
,7
]}

机构：

[1] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton, Tsukuba, Ibaraki 3050003, Japan

[2] Natl Inst Mat Sci, Res Network & Facil Serv Div, Tsukuba, Ibaraki 3050047, Japan

[3] Natl Inst Mat Sci, Ctr Green Res Energy & Environm Mat, Tsukuba, Ibaraki 3050003, Japan

[4] Natl Inst Mat Sci, Res Ctr Funct Mat, Tsukuba, Ibaraki 3050003, Japan

[5] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan

[6] Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China

[7] CAS Ctr Excellence Superconducting Elect CENSE, Shanghai 200050, Peoples R China

来源：

PHYSICAL REVIEW B | 2020年 / 102卷 / 05期

关键词：

NEMATIC SUSCEPTIBILITY; IRON; SUPERCONDUCTIVITY; SCATTERING; ANISOTROPY; CRYSTAL; STATE; ORDER;

D O I：

10.1103/PhysRevB.102.054511

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report resistance and elastoresistance measurements on (Ba0.5K0.5)Fe2As2, CaKFe4As4, and KCa2Fe4As4F2. The Fe-site symmetry is D-2d in the first compound but C-2v in the latter two, which lifts the degeneracy of the Fe d(xz) and d(yz) orbitals. The temperature dependence of the resistance and elastoresistance is similar between the three compounds. Especially, the [110] elastoresistance is enhanced with decreasing temperature irrespective of the Fe-site symmetry. This appears to be in conflict with recent Raman scattering studies on CaKFe4As4, which suggest the absence of nematic fluctuations. We consider possible ways of reconciliation and suggest that the present result is important in elucidating the origin of in-plane resistivity anisotropy in iron-based superconductors.

引用

页数：7

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