Fermi surface gapping and nesting in the surface phase transition of Sn/Cu(100) -: art. no. 041401

被引：28

作者：

Martínez-Blanco, J ^{[1
]}

Joco, V

Ascolani, H

Tejeda, A

Quirós, C

Panaccione, G

Balasubramanian, T

Segovia, P

Michel, EG

机构：

[1] Univ Autonoma Madrid, Dpto Fis Mat Condensada, E-28049 Madrid, Spain

[2] Univ Autonoma Madrid, Inst Univ Ciencia Mat Nicolas Cabrera, E-28049 Madrid, Spain

[3] Comis Nacl Energia Atom, Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[4] Consejo Nacl Invest Cient & Tecn, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[5] Univ Paris 07, CNRS, FR 2437, F-75251 Paris, France

[6] Univ Oviedo, Dpto Fis, Oviedo 33007, Spain

[7] INFM, Lab TASC, I-34012 Trieste, Italy

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 04期

关键词：

D O I：

10.1103/PhysRevB.72.041401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We identify and characterize a two-dimensional phase transition in a layer of Sn on Cu(100). The stable phase at room temperature has a (3 root 2 x root 2)R45 degrees structure. Above similar to 360 K, a new phase with (root 2 x root 2)R45 degrees structure is formed. The high-temperature phase exhibits a quasi-two-dimensional free-electron surface band, with Fermi surface nesting in excellent agreement with the three-times larger periodicity of the low-temperature phase. A momentum-dependent band gap opens along the nested areas of the Fermi surface in the low-temperature phase. The phase transition is a clear experimental confirmation of the role of Fermi-surface gapping and nesting in the stabilization of a commensurate two-dimensional phase, which is interpreted as a charge-density wave.

引用

页数：4

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