Observation of multiple-gap structure in hidden order state of URu2Si2 from optical conductivity

被引：14

作者：

Hall, Jesse S. ^{[1
]}

Nagel, Urmas ^{[2
]}

Uleksin, Taaniel ^{[2
]}

Room, Toomas ^{[2
]}

Williams, Travis ^{[1
]}

Luke, Graeme ^{[1
,3
]}

Timusk, Thomas ^{[1
,3
]}

机构：

[1] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada

[2] Nat Inst Chem Phys & Biophys, EE-12618 Tallinn, Estonia

[3] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 03期

关键词：

ELECTRON SUPERCONDUCTOR URU2SI2; FERMION SYSTEM URU2SI2; SYMMETRY-BREAKING; SURFACE; EXCITATIONS; RESISTIVITY; TRANSITIONS; LATTICE; PHASE;

D O I：

10.1103/PhysRevB.86.035132

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have measured the far-infrared reflectance of the heavy-fermion compound URu2Si2 through the phase transition at T-HO = 17.5 K dubbed "hidden order" with light polarized along both the a and c axes of the tetragonal structure. The optical conductivity allows the formation of the hidden order gap to be investigated in detail. We find that both the conductivity and the gap structure are anisotropic, and that the c-axis conductivity shows evidence for a double gap structure, with Delta(1),(c) = 2.7 meV and Delta(2),(c) = 1.8 meV, respectively, at 4 K, while the gap seen in the a-axis conductivity has a value of Delta(a) = 3.2 meV at 4 K. The opening of the gaps does not follow the behavior expected from mean-field theory in the vicinity of the transition.

引用

页数：7

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