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26 papers · 1 filter
Constraint Effective Potential of the Magnetization in the Quantum XY Model
U. Gerber, C. P. Hofmann, F. -J. Jiang +3
Using an improved estimator in the loop-cluster algorithm, we investigate the constraint effective potential of the magnetization in the spin quantum XY model. The n…
U(1)-Symmetry breaking and violation of axial symmetry in TlCuCl3 and other insulating spin systems
Raffaele Dell'Amore, Andreas Schilling, Karl Kraemer
We describe the Bose-Einstein condensate of magnetic bosonic quasiparticles in insulating spin systems using a phenomenological standard functional method for T = 0. We show that r…
Constraint Effective Potential of the Staggered Magnetization in an Antiferromagnet
U. Gerber, C. P. Hofmann, F. -J. Jiang +2
We employ an improved estimator to calculate the constraint effective potential of the staggered magnetization in the spin quantum Heisenberg model using a loop-clus…
Direct Observation of Magnon Fractionalization in the Quantum Spin Ladder
B. Thielemann, Ch. Rüegg, H. M. Rønnow +12
We measure by inelastic neutron scattering the spin excitation spectra as a function of applied magnetic field in the quantum spin-ladder material (C5H12N)2CuBr4. Discrete magnon m…
Field-Controlled Magnetic Order in the Quantum Spin-Ladder System (Hpip)2CuBr4
B. Thielemann, Ch. Rüegg, K. Kiefer +18
Neutron diffraction is used to investigate the field-induced, antiferromagnetically ordered state in the two-leg spin-ladder material (Hpip)2CuBr4. This "classical" phase, a conseq…
Thermodynamics of the Spin Luttinger-Liquid in a Model Ladder Material
Ch. Rüegg, K. Kiefer, B. Thielemann +11
The phase diagram in temperature and magnetic field of the metal-organic, two-leg, spin-ladder compound (C5H12N)2CuBr4 is studied by measurements of the specific heat and the magne…