Lattice dynamics of the cluster chain compounds M2Mo6Se6 (M = K, Rb, Cs, In, and Tl)

被引：9

作者：

Gannon, Liam ^{[1
,2
]}

Boeri, Lilia ^{[3
,4
]}

Howard, Christopher A. ^{[5
]}

Gougeon, Patrick ^{[6
]}

Gall, Philippe ^{[6
]}

Potel, Michel ^{[6
]}

Salloum, Diala ^{[6
,9
]}

Petrovic, Alexander P. ^{[7
,10
]}

Hoesch, Moritz ^{[1
,8
]}

机构：

[1] Diamond Light Source, Harwell Campus, Didcot OX11 0DE, Oxon, England

[2] Univ Oxford, Phys Dept, Clarendon Lab, Parks Rd, Oxford OX1 3PU, England

[3] Sapienza Univ Roma, Dept Fis, I-00185 Rome, Italy

[4] CNR, ISC, I-00185 Rome, Italy

[5] UCL, Dept Phys & Astron, London WC1E 6BT, England

[6] Univ Rennes 1, Lab Chim Solide & Inorgan Mol, INSA, CNRS,UMR 6226, Ave Gen Leclerc, F-35042 Rennes, France

[7] Univ Geneva, Dept Quantum Matter Phys, 24 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland

[8] DESY, DESY Photon Sci, Notekestr 85, D-22607 Hamburg, Germany

[9] Lebanese Univ, Fac Sci 3, POB 826, Kobbeh Tripoli, Lebanon

[10] Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, 21 Nanyang Link, Singapore 637371, Singapore

来源：

PHYSICAL REVIEW B | 2018年 / 98卷 / 01期

关键词：

CHALCOGENIDES; TRANSITION; TL2MO6SE6; METAL;

D O I：

10.1103/PhysRevB.98.014104

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The lattice dynamics of members of the M2Mo6Se6 family of materials with guest ions M = K, Rb, Cs, In, and Tl has been studied using inelastic x-ray scattering and Raman spectroscopy at room temperature, as well as by ab initio calculations. We find a good match between calculations and experiment, both for structure factors (eigenvectors) and for the calculated phonon frequencies. The observed lattice dynamics for Tl2Mo6Se6 show no signs of anharmonicity or absence of avoided dispersion crossings, thus ruling out previously hypothesized rattling phonon modes. The reduced mode energies for In2Mo6Se6 are identified as only partially responsible for the lower superconducting transition temperature T-c in this material when compared to Tl2Mo6Se6.

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页数：6

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