Bella Lake
Technical University of Berlin
Neutron scatteringQuantum spin liquidMagnetic fieldPhysicsInelastic scatteringAntiferromagnetismMagnetic susceptibilityMagnetic structureMaterials scienceMagnetismCondensed matter physicsInelastic neutron scatteringSpin waveSpin (physics)SuperconductivityQuantum mechanicsGround stateNeutron diffractionSpin-½Quantum
149Publications
28H-index
3,438Citations
Publications 147
Newest
#1A. R. N. Hanna (Technical University of Berlin)H-Index: 1
#2A. T. M. N. Islam (Helmholtz-Zentrum Berlin)H-Index: 11
Last. Bella Lake (Technical University of Berlin)H-Index: 28
view all 7 authors...
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#1Vladimir Gnezdilov (Braunschweig University of Technology)
#2Vladimir KurnosovH-Index: 3
Last. Peter Lemmens (Braunschweig University of Technology)H-Index: 39
view all 9 authors...
The S=1Haldane state is constructed from a product of local singlet dimers in the bulk and topological states at the edges of a chain. It is a fundamental representative of topological quantum matter. Its well-known representative, the quasi-one-dimensional SrNi_2_2_8shows both conventional as well as unconventional magnetic Raman scattering. The former is observed as one- and two-triplet excitations with small linewidths and energies corresponding to the Haldane gap \Delta_Hand t...
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#1S. Chillal (Helmholtz-Zentrum Berlin)H-Index: 4
#2A. T. M. N. Islam (Helmholtz-Zentrum Berlin)H-Index: 11
Last. Bella Lake (Technical University of Berlin)H-Index: 28
view all 5 authors...
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#5F. Bourdarot (UGA: University of Grenoble)H-Index: 20
In this work, we investigate the evolution and settling of magnon condensation in the spin-1/2 dimer system Sr_{3}r_{2}_{8}using a combination of magnetostriction in pulsed fields and inelastic neutron scattering in a continuous magnetic field. The magnetic structure in the Bose-Einstein condensation (BEC) phase was probed by neutron diffraction in pulsed magnetic fields up to 39~T. The magnetic structure in this phase was confirmed to be an XY-antiferromagnetic structure validated by i...
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#1E. S. KlyushinaH-Index: 3
#2Johannes ReutherH-Index: 25
Last. Bella Lake (Technical University of Berlin)H-Index: 28
view all 9 authors...
We investigate the critical properties of the spin-1honeycomb antiferromagnet BaNi_2_2_8 both below and above the ordering temperature T_Nusing neutron diffraction and muon spin rotation measurements. Our results characterize BaNi_2_2_8as a two-dimensional (2D) antiferromagnet across the entire temperature range, displaying a series of crossovers from 2D Ising-like to 2D XY and then to 2D Heisenberg behavior with increasing temperature. In particular, the extracted critic...
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#1A. R. N. HannaH-Index: 1
#2A. T. M. N. IslamH-Index: 1
Last. Bella LakeH-Index: 28
view all 7 authors...
Single crystals of the three-dimensional frustrated magnet and spin liquid candidate compound PbCuTe_2_6were grown using both the Travelling Solvent Floating Zone (TSFZ) and the Top-Seeded Solution Growth (TSSG) techniques. The growth conditions were optimized by investigating the thermal properties. The quality of the crystals was checked by polarized optical microscopy, X-ray Laue and X-ray powder diffraction, and compared to the polycrystalline samples. Excellent quality crystals were o...
#1Allen ScheieH-Index: 11
#2Pontus LaurellH-Index: 10
Last. D. A. TennantH-Index: 37
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We demonstrate how quantum entanglement can be directly witnessed in the quasi-1D Heisenberg antiferromagnet KCuF_3 We apply three entanglement witnesses --- one-tangle, two-tangle, and quantum Fisher information --- to its inelastic neutron spectrum, and compare with spectra simulated by finite-temperature density matrix renormalization group (DMRG) and classical Monte Carlo methods. We find that each witness provides direct access to entanglement. Of these, quantum Fisher information is the...
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#1Walter Schnelle (MPG: Max Planck Society)H-Index: 57
Last. Hubertus LuetkensH-Index: 41
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The silver ruthenium oxide AgRuO_3consists of honeycomb [Ru_2^{5+}_6^{2-} layers, and can be considered an analogue of SrRu_2_6with a different intercalation stage. We present measurements of magnetic susceptibility and specific heat on AgRuO_3single crystals which reveal a sharp antiferromagnetic transition at 342(3)K. The electrical transport in single crystals of AgRuO_3is determined by a combination of activated conduction over an intrinsic semiconducting gap of $\approx...
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#1A. SamartzisH-Index: 3
#2S. Chillal (Helmholtz-Zentrum Berlin)H-Index: 4
Last. Bella Lake (Technical University of Berlin)H-Index: 28
view all 9 authors...
We investigate the structural and magnetic properties of the new quantum magnet BaCuTe_2_6 This compound is synthesized for the first time in powder and single crystal form. Synchrotron X-ray and neutron diffraction reveal a cubic crystal structure (P4_12) where the magnetic Cu^{2+}ions form a complex network. Physical properties measurements suggest the presence of antiferromagnetic interactions with a Curie-Weiss temperature of -33K, while long-range magnetic order occurs at the mu...
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