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Fabrice Bert
University of Paris-Sud
49Publications
13H-index
644Citations
Publications 50
Newest
#1Alex LouatH-Index: 1
#2Benjamin LenzH-Index: 2
Last.Veronique BrouetH-Index: 17
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#2Pascal PuphalH-Index: 3
Last.Fabrice BertH-Index: 13
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2 CitationsSource
#1Alex LouatH-Index: 1
#2Benjamin LenzH-Index: 1
Last.Veronique BrouetH-Index: 17
view all 9 authors...
Sr2IrO4 is characterized by a large spin-orbit coupling, which gives rise to bands with strongly entangled spin and orbital characters, called J=1/2 and J=3/2. We use light-polarization dependent ARPES to study directly the orbital character of these bands and fully map out their dispersion. We observe bands in very good agreement with our cluster dynamical mean-field theory calculations. We show that the J=1/2 band, the closest to the Fermi level Ef, is dominated by dxz character along kx and d...
#2Pascal PuphalH-Index: 3
Last.Fabrice BertH-Index: 13
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The quantum kagome antiferromagnets YCu3(OH)6OxCl3-x (x=0,1/3) are produced using a unified solid state synthesis route for polycrystalline samples. From structural refinements based on neutron diffraction data, we clarify the structure of the Y3Cu9(OH)18OCl8 (x=1/3) compound and provide a revised chemical formula. We use muon spin relaxation, as a local probe of magnetism, to investigate the exotic low temperature properties in the two compounds. In agreement with the low temperature neutron di...
#1Marko BosiočićH-Index: 2
#2Fabrice BertH-Index: 13
Last.Philippe MendelsH-Index: 28
view all 7 authors...
#1Alex LouatH-Index: 1
#2Fabrice BertH-Index: 13
Last.Veronique BrouetH-Index: 17
view all 7 authors...
We study with Angle-Resolved Photoemission the insulator to metal transition observed in Sr_2rO_4when xIr are substituted by Rh (0.02 0.07, is not a Fermi liquid. It is characterized by the absence of quasiparticles, unrenormalized band dispersion compared to calculations and a \sim0meV pseudo-gap on the entire FS. The originality of this behavior is that Ir and Rh, which are formally isovalent, adopt different charge states. We propose that results from different hybridization stren...
Source
#1Marko Bosiočić (University of Zagreb)H-Index: 2
#2Fabrice Bert (University of Paris-Sud)H-Index: 13
Last.Philippe Mendels (University of Paris-Sud)H-Index: 28
view all 7 authors...
The frustrated one-dimensional quantum magnet LiCuSbO4 is a rare realization of the J1−J2 spin chain model with an easily accessible saturation field, formerly estimated at 12 T. Exotic multipolar nematic phases were theoretically predicted in such compounds just below the saturation field, but without unambiguous experimental observation so far. In this paper we present extensive experimental research on the compound in a wide temperature (30 mK to 300 K) and field (0–13.3 T) range by muon spin...
3 CitationsSource
#1Abhishek Nag (IACS: Indian Association for the Cultivation of Science)H-Index: 7
#2Sayantika Bhowal (IACS: Indian Association for the Cultivation of Science)H-Index: 6
Last.Sugata Ray (IACS: Indian Association for the Cultivation of Science)H-Index: 16
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While it was speculated that 5d^4systems would possess non-magnetic J=~0 ground state due to strong Spin-Orbit Coupling (SOC), all such systems have invariably shown presence of magnetic moments so far. A puzzling case is that of Ba_2IrO_6 which in spite of having a perfectly cubic structure with largely separated Ir^{5+}(d^4 ions, has consistently shown presence of weak magnetic moments. Moreover, we clearly show from Muon Spin Relaxation (\muR) measurements that a change i...
6 CitationsSource
#1Philippe Mendels (Université Paris-Saclay)H-Index: 28
#2Fabrice Bert (Université Paris-Saclay)H-Index: 13
Abstract After introducing the field of Highly Frustrated Magnetism through the quest for a quantum spin liquid in dimension higher than one, we focus on the emblematic case of the kagome network. From a theoretical point of view, the simple Heisenberg case for an antiferromagnetic kagome lattice decorated with quantum spins has been a long-standing problem, not solved yet. Experimental realizations have remained scarce for long until the discovery of herbertsmithite ZnCu 3 (OH) 6 Cl 2 in 2005. ...
22 CitationsSource
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