Welcome to the web page of the Swiss National Science Foundation funded Sinergia network “Mott Physics Beyond the Heisenberg-model” (MPBH).

MPBH is a network of research groups in Switzerland linked to a strong international network of collaborators joining forces in a coherent research effort into the physics of strongly correlated electron systems around the Mott transition between strange metals and quantum magnets – expanding our understanding from the heralded Heisenberg model to the inclusion of spin-orbit coupling, magnetoelectric effects etc.

What elevates this Sinergia project above a regular research collaboration is that the funding brings together a complete set of experts – synthesis, complementary experiment and theory – allowing a strong and uniquely coherent impact on the field. The work has been divided into 4 sub-projects, which are outlined on the Topics page.

Latest Mott Physics Publications

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Correlation of the superconducting critical temperature with spin and orbital excitations in (CaxLa1− x)(Ba1. 75− xLa 0. 25) Cu3Oy as measured by resonant inelastic x-ray scattering

D. S. Ellis; Y-B. Huang; P. Olalde-Velasco; M. Dantz; J. Pelliciari et al. 

Physical Review B. 2015. Vol. 92, num. 10, p. 104507. DOI : 10.1103/PhysRevB.92.104507.

Spin-orbit-induced orbital excitations in Sr2RuO4 and Ca2RuO4: A resonant inelastic x-ray scattering study

C. G. Fatuzzo; M. Dantz; S. Fatale; P. Olalde-Velasco; N. E. Shaik et al. 

Physical Review B. 2015. Vol. 91, num. 15, p. 155104. DOI : 10.1103/PhysRevB.91.155104.

Fractional excitations in the square-lattice quantum antiferromagnet

B. D. Piazza; M. Mourigal; N. B. Christensen; G. J. Nilsen; P. Tregenna-Piggott et al. 

Nature Physics. 2015. Vol. 11, num. 1, p. 62-68. DOI : 10.1038/Nphys3172.

Asymmetry of collective excitations in electron- and hole-doped cuprate superconductors

W. S. Lee; J. J. Lee; E. A. Nowadnick; S. Gerber; W. Tabis et al. 

Nature Physics. 2014. Vol. 10, num. 11, p. 883-889. DOI : 10.1038/nphys3117.

Self-doping processes between planes and chains in the metal-to-superconductor transition of YBa2Cu3O6.9

M. Magnuson; T. Schmitt; V. N. Strocov; J. Schlappa; A. S. Kalabukhov et al. 

Scientific Reports. 2014. Vol. 4, p. 7017. DOI : 10.1038/srep07017.

Itinerant effects and enhanced magnetic interactions in Bi-based multilayer cuprates

M. P. M. Dean; A. J. A. James; A. C. Walters; V. Bisogni; I. Jarrige et al. 

Physical Review B. 2014. Vol. 90, num. 22. DOI : 10.1103/PhysRevB.90.220506.

Femtosecond Dynamics of Momentum-Dependent Magnetic Excitations from Resonant Inelastic X-Ray Scattering in CaCu2O3

V. Bisogni; S. Kourtis; C. Monney; K. Zhou; R. Kraus et al. 

Physical Review Letters. 2014. Vol. 112, num. 14. DOI : 10.1103/PhysRevLett.112.147401.

Charge-orbital-lattice coupling effects in the dd excitation profile of one-dimensional cuprates

J. J. Lee; B. Moritz; W. S. Lee; M. Yi; C. J. Jia et al. 

Physical Review B. 2014. Vol. 89, num. 4. DOI : 10.1103/PhysRevB.89.041104.

Angle-Resolved Photoemission Spectroscopy of Tetragonal CuO: Evidence for Intralayer Coupling Between Cupratelike Sublattices

S. Moser; L. Moreschini; H. Yang; D. Innocenti; F. Fuchs et al. 

Physical Review Letters. 2014. Vol. 113, num. 18, p. 187001. DOI : 10.1103/PhysRevLett.113.187001.

Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates

M. Guarise; B. Dalla Piazza; H. Berger; E. Giannini; T. Schmitt et al. 

Nature Communications. 2014. Vol. 5, p. 5760. DOI : 10.1038/ncomms6760.

Nonequilibrium hysteresis and spin relaxation in the mixed-anisotropy dipolar-coupled spin-glass LiHo0.5Er0.5F4

J. O. Piatek; I. Kovacevic; P. Babkevich; B. D. Piazza; S. Neithardt et al. 

Physical Review B. 2014. Vol. 90, num. 17. DOI : 10.1103/PhysRevB.90.174427.

Exploring the spin-orbital ground state of Ba3CuSb2O9

A. Smerald; F. Mila 

Physical Review B. 2014. Vol. 90, num. 9. DOI : 10.1103/PhysRevB.90.094422.

Correlated Decay of Triplet Excitations in the Shastry-Sutherland Compound SrCu2(BO3)(2)

M. E. Zayed; C. Rueegg; T. Straessle; U. Stuhr; B. Roessli et al. 

Physical Review Letters. 2014. Vol. 113, num. 6, p. 067201. DOI : 10.1103/PhysRevLett.113.067201.

Bilayer splitting and wave functions symmetry in Sr3Ir2O7

L. Moreschini; S. Moser; A. Ebrahimi; B. Dalla Piazza; K. S. Kim et al. 

Physical Review B. 2014. Vol. 89, num. 20, p. 201114(R). DOI : 10.1103/PhysRevB.89.201114.

Nodal Landau Fermi-liquid quasiparticles in overdoped La1.77Sr0.23CuO4

C. G. Fatuzzo; Y. Sassa; M. Månsson; S. Pailhès; O. J. Lipscombe et al. 

Physical Review B. 2014. Vol. 89, num. 20. DOI : 10.1103/PhysRevB.89.205104.

L4Fe2As2Te1-xO4-yFy (L = Pr, Sm, Gd): A layered oxypnictide superconductor with T-c up to 45 K

S. Katrych; A. Pisoni; S. Bosma; S. Weyeneth; N. D. Zhigadlo et al. 

Physical Review B. 2014. Vol. 89, num. 2. DOI : 10.1103/PhysRevB.89.024518.

Orbital occupancies and the putative j(eff)=1/2 ground state in Ba2IrO4: A combined oxygen K-edge XAS and RIXS study

M. M. Sala; M. Rossi; S. Boseggia; J. Akimitsu; N. B. Brookes et al. 

Physical Review B. 2014. Vol. 89, num. 12, p. 121101. DOI : 10.1103/PhysRevB.89.121101.

The electronic structure of the high-symmetry perovskite iridate Ba2IrO4

S. Moser; L. Moreschini; A. Ebrahimi; B. Dalla Piazza; M. Isobe et al. 

New Journal of Physics. 2014. Vol. 16, num. 1, p. 013008. DOI : 10.1088/1367-2630/16/1/013008.

Theory of spin excitations in a quantum spin-nematic state

A. Smerald; N. Shannon 

Physical Review B. 2013. Vol. 88, num. 18. DOI : 10.1103/PhysRevB.88.184430.

Robustness of Basal-Plane Antiferromagnetic Order and the Jeff=1/2 State in Single-Layer Iridate Spin-Orbit Mott Insulators

S. Boseggia; R. Springell; H. Walker; H. M. Rønnow; C. Rüegg et al. 

Physical Review Letters. 2013. Vol. 110, num. 11. DOI : 10.1103/PhysRevLett.110.117207.

Glassy low-energy spin fluctuations and anisotropy gap in La1.88Sr0.12CuO4

A. T. Romer; J. Chang; N. B. Christensen; B. M. Andersen; K. Lefmann et al. 

Physical Review B. 2013. Vol. 87, num. 14. DOI : 10.1103/PhysRevB.87.144513.

Huge critical current density and tailored superconducting anisotropy in SmFeAsO0.8F0.15 by low-density columnar-defect incorporation

L. Fang; Y. Jia; V. Mishra; C. Chaparro; V. K. Vlasko-Vlasov et al. 

Nature Communications. 2013. Vol. 4. DOI : 10.1038/ncomms3655.

Locking of iridium magnetic moments to the correlated rotation of oxygen octahedra in Sr2IrO4 revealed by x-ray resonant scattering

S. Boseggia; H. C. Walker; J. Vale; R. Springell; Z. Feng et al. 

Journal Of Physics-Condensed Matter. 2013. Vol. 25, num. 42, p. 191071. DOI : 10.1088/0953-8984/25/42/422202.

Phase diagram of the spin-1 Heisenberg model with three-site interactions on the square lattice

F. Michaud; F. Mila 

Physical Review B. 2013. Vol. 88, num. 9. DOI : 10.1103/PhysRevB.88.094435.

Possible spin-orbit driven spin-liquid ground state in the double perovskite phase of Ba3YIr2O9

T. Dey; A. V. Mahajan; R. Kumar; B. Koteswararao; F. C. Chou et al. 

Physical Review B Condensed Matter. 2013. Vol. 88, p. 134425. DOI : 10.1103/PhysRevB.88.134425.

Spin-gap evolution upon Ca doping in the spin-ladder series Sr(14−x)CaxCu24O41 studied by inelastic neutron scattering

G. Deng; N. Tsyrulin; P. Bourges; D. Lamago; H. M. Ronnow et al. 

Physical Review B. 2013. Vol. 88, num. 1. DOI : 10.1103/PhysRevB.88.014504.

Temperature-dependent electron-phonon coupling in La_{2−x}Sr_{x}CuO_{4} probed by femtosecond x-ray diffraction

B. Mansart; M. J. G. Cottet; G. F. Mancini; T. Jarlborg; S. B. Dugdale et al. 

Physical Review B. 2013. Vol. 88, num. 5, p. 054507. DOI : 10.1103/PhysRevB.88.054507.

Phase diagram with an enhanced spin-glass region of the mixed Ising–XY magnet LiHoxEr1-xF4

J. Piatek; B. Dalla Piazza; N. Nikseresht; N. Tsyrulin; I. Zivkovic et al. 

Physical Review B Condensed Matter. 2013. Vol. 88, p. 014408. DOI : 10.1103/PhysRevB.88.014408.

Low-temperature spin dynamics of a valence bond glass in Ba2YMoO6

M. de Vries; J. O. Piatek; M. Misek; J. S. Lord; H. M. Ronnow et al. 

New Journal of Physics. 2013. Vol. 15, p. 043024. DOI : 10.1088/1367-2630/15/4/043024.

Determining the Short-Range Spin Correlations in the Spin-Chain Li2CuO2 and CuGeO3 Compounds Using Resonant Inelastic X-Ray Scattering

C. Monney; V. Bisogni; K-J. Zhou; R. Kraus; V. N. Strocov et al. 

Physical Review Letters. 2013. Vol. 110, num. 8. DOI : 10.1103/PhysRevLett.110.087403.