Evidence for strongly coupled charge-density-wave ordering in three-dimensional R5Ir4Si10 compounds from optical measurements

被引：10

作者：

Tediosi, Riccardo ^{[1
]}

Carbone, Fabrizio ^{[1
]}

Kuzmenko, A. B. ^{[1
]}

Teyssier, J. ^{[1
]}

van der Marel, D. ^{[1
]}

Mydosh, J. A. ^{[2
]}

机构：

[1] Univ Geneva, DPMC, CH-1211 Geneva 4, Switzerland

[2] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 03期

基金：

瑞士国家科学基金会;

关键词：

RARE-EARTH; 2H-TASE2; METALS; PHASE; K0.3MOO3; DYNAMICS; ELECTRODYNAMICS; SUPERCONDUCTORS; TRANSITIONS; LU5IR4SI10;

D O I：

10.1103/PhysRevB.80.035107

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report optical spectra of Lu5Ir4Si10 and Er5Ir4Si10, exhibiting the phenomenon of coexisting superconductivity or antiferromagnetism and charge-density wave (CDW) order. We measure the maximum value of the charge-density wave gap present on part of the Fermi surface of Lu5Ir4Si10, corresponding to a ratio 2 Delta/k(B)T(CDW)similar or equal to 10, well above the value in the limit of weak electron-phonon coupling. Strong electron-phonon coupling was confirmed by analyzing the optical conductivity with the Holstein model describing the electronphonon interactions, indicating the coupling to phonons centered at 30 meV, with a coupling constant lambda approximate to 2.6. Finally we provide evidence that approximately 16% of the Fermi surface of Lu5Ir4Si10 becomes gapped in the CDW state.

引用

页数：11

共 34 条

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[32] Phonon and polarized reflectance spectra from Si(111)-(4x1)In: Evidence for a charge-density-wave driven phase transition
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[34] Interplay of superconductivity and charge density wave ordering in pseudoternary alloy compounds: Lu2Ir3(Si1-xGex)5, Lu2(Ir1-xRhx)3Si5, and (Lu1-xScx)Ir3Si5
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