Quantum kagome spin liquids Philippe Mendels - Univ Paris-Sud Orsa The discovery of Herbertsmithite, ZnCu 3 (OH) 6 Cl 2 , which features a perfect kagome geometry, has been coined as the "end to the drought of spin liquids" [1,2]. It has triggered an intense activity on new kagome materials and related theories for the ground state of the quantum kagome Heisenberg antiferromagnet which has eluded any definitive conclusion for the last twenty years. This is indeed the first experimental example of a kagome lattice where no order has been found at any temperature well below J through all experimental techniques, among which µSR [3] has been by far the most accurate. This illustrates the power of the association of an enhancement of quantum fluctuations for S=1/2 spins with the frustration of antiferromagnetic interactions on the loosely connected kagome lattice to stabilize novel ground states of magnetic matter, namely quantum spin liquids. I will review and discuss our contribution to this field through µSR, in connection with our NMR work. Through the various Cu 2+ S=1/2 materials which we have studied, I’ll illustrate some of the research thrusts in tracking down quantum spin liquid physics. This will encompass Zn and Mg-paratacamites, (Zn,Mg) x Cu 4-x (OH) 6 Cl 2 [) , their polymorphs kapellasite [4] and haydeite, vesignieite [5] as well as the recently discovered triangular-based lattice Ba 3 CuSb 2 O 9 [6] compound. [1] P.A.Lee, Science, Perspectives 321, 1306 (2008). [2] For a review, see P. Mendels and F.Bert, Special Topics Section on "Novel States of Matter Induced by Frustration", J. Phys. Soc. Jpn 1, 011001 (2010). [3] Phys. Rev. Lett. 98, 077204 (2010). [4] Phys. Rev. Lett. 109, 037208 (2012). [5] Phys. Rev. B 84, 180401 (2011). [6] Phys. Rev. Lett., in press.
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Quantum kagome spin liquids · Quantum kagome spin liquids Philippe Mendels - Univ Paris-Sud Orsa The discovery of Herbertsmithite, ZnCu 3(OH)6Cl2, which features a perfect kagome
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Quantum kagome spin liquids
Philippe Mendels - Univ Paris-Sud Orsa
The discovery of Herbertsmithite, ZnCu3(OH)6Cl2, which features a perfect kagome geometry, has
been coined as the "end to the drought of spin liquids" [1,2]. It has triggered an intense activity on
new kagome materials and related theories for the ground state of the quantum kagome Heisenberg
antiferromagnet which has eluded any definitive conclusion for the last twenty years.
This is indeed the first experimental example of a kagome lattice where no order has been found at
any temperature well below J through all experimental techniques, among which µSR [3] has been by
far the most accurate. This illustrates the power of the association of an enhancement of quantum
fluctuations for S=1/2 spins with the frustration of antiferromagnetic interactions on the loosely
connected kagome lattice to stabilize novel ground states of magnetic matter, namely quantum spin
liquids.
I will review and discuss our contribution to this field through µSR, in connection with our NMR work.
Through the various Cu2+
S=1/2 materials which we have studied, I’ll illustrate some of the research
thrusts in tracking down quantum spin liquid physics. This will encompass Zn and Mg-paratacamites,
(Zn,Mg)xCu4-x(OH)6Cl2 [), their polymorphs kapellasite [4] and haydeite, vesignieite [5] as well as the
Ross H Colman, David Boldrin, Andrew S Wills, UCL, UKP. Strobel, Institut Neel, Grenoble, FranceA. Harrisson, M. de Vries, Edinburgh, UKF. Duc, Toulouse