Momentum-Resolved Evolution of the Kondo Lattice into "Hidden Order" in URu2Si2

被引：48

作者：

Boariu, F. L. ^{[1
]}

Bareille, C. ^{[2
,3
]}

Schwab, H. ^{[1
]}

Nuber, A. ^{[1
]}

Lejay, P. ^{[4
]}

Durakiewicz, T. ^{[5
]}

Reinert, F. ^{[1
,6
]}

Santander-Syro, A. F. ^{[2
,3
]}

机构：

[1] Univ Wurzburg, Lehrstuhl Expt Phys 7, D-97074 Wurzburg, Germany

[2] Univ Paris 11, CSNSM, F-91405 Orsay, France

[3] CNRS, IN2P3, F-91405 Orsay, France

[4] UJF, CNRS, Inst Neel, F-38042 Grenoble 9, France

[5] Los Alamos Natl Lab, MPA CMMS, Los Alamos, NM 87544 USA

[6] KIT, Gemeinschaftslab Nanoanalyth, D-76021 Karlsruhe, Germany

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 15期

关键词：

FERMI-SURFACE; MAGNETIC EXCITATIONS; SPIN EXCITATIONS; STATE; SYSTEM; SUPERCONDUCTIVITY; SPECTROSCOPY; TRANSITION; PRESSURE;

D O I：

10.1103/PhysRevLett.110.156404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study, using high-resolution angle-resolved photoemission spectroscopy, the evolution of the electronic structure in URu2Si2 at the Gamma, Z, and X high-symmetry points from the high-temperature Kondo-screened regime to the low-temperature hidden-order (HO) state. At all temperatures and symmetry points, we find structures resulting from the interaction between heavy and light bands related to the Kondo-lattice formation. At the X point, we directly measure a hybridization gap of 11 meV already open at temperatures above the ordered phase. Strikingly, we find that while the HO induces pronounced changes at Gamma and Z, the hybridization gap at X does not change, indicating that the hidden-order parameter is anisotropic. Furthermore, at the Gamma and Z points, we observe the opening of a gap in momentum in the HO state, and show that the associated electronic structure results from the hybridization of a light electron band with the Kondo-lattice bands characterizing the paramagnetic state. DOI: 10.1103/PhysRevLett.110.156404

引用

页数：5

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