Evidence for a spinon Fermi surface in the triangular S=1 quantum spin liquid Ba3NiSb2O9

被引：36
|
作者：
Fak, B. [1 ]
Bieri, S. [2 ,3 ]
Canevet, E. [1 ,4 ,5 ]
Messio, L. [3 ]
Payen, C. [6 ]
Viaud, M. [6 ]
Guillot-Deudon, C. [6 ]
Darie, C. [7 ]
Ollivier, J. [1 ]
Mendels, P. [8 ]
机构：
[1] Inst Laue Langevin, CS 20156, F-38042 Grenoble 9, France
[2] ETH, Inst Theoret Phys, CH-8099 Zurich, Switzerland
[3] Univ Paris 06, Sorbonne Univ, Lab Phys Theor Matiere Condensee, CNRS UMR 7600, F-75252 Paris, France
[4] Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland
[5] Univ Paris Sud 11, CNRS UMR 8502, Lab Phys Solides, F-91405 Orsay, France
[6] Univ Nantes, CNRS UMR 6502, Inst Mat Jean Rouxel, F-44322 Nantes 3, France
[7] Univ Grenoble Alpes, CNRS, Inst Neel, Boite Postale 166, F-38042 Grenoble, France
[8] Univ Paris 11, Univ Paris Saclay, CNRS, Lab Phys Solides, F-91405 Orsay, France
来源：
PHYSICAL REVIEW B | 2017年 / 95卷 / 06期
关键词：
ANTIFERROMAGNET; STATE;
D O I：
10.1103/PhysRevB.95.060402
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Inelastic neutron scattering is used to study the low-energy magnetic excitations in the spin-1 triangular lattice of the 6H-B phase of Ba3NiSb2O9. We study two powder samples: Ba3NiSb2O9 synthesized under high pressure and Ba2.5Sr0.5NiSb2O9 in which chemical pressure stabilizes the 6H-B structure. Themeasured excitation spectra show broad gapless and nondispersive continua at characteristic wave vectors. Our data rules out most theoretical scenarios that have previously been proposed for this phase, and we find that it is well described by an exotic quantum spin liquid with three flavors of unpaired fermionic spinons, forming a large spinon Fermi surface.
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页数：5
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