Through experiments at the BER II neutron source and its High-Field Magnet, researchers have discovered new quantum states in the material SrCu2( BO3) 2 under severe magnetic fields. A worldwide group has actually now gotten brand-new insights into these special states of matter through experiments at the Berlin neutron source BER II and its High-Field Magnet. The best place to analyze these results was at the neutron source BER II, where an HZB team has set up an unique High-Field Magnet, reaching up to nearly 26 Teslas.Schematic illustration of a 2D spin-lattice with orthogonal orientation of spin sets. Magnetic order in such products is typically described as Bose-Einstein Condensation (BEC) of magnons.Physicists in front of the High-Field Magnet at BER II throughout one of the last measurements. There is even an analogy to superconductivity, recommending that the spin-nematic stage in SrCu2( BO3) 2 is best understood as a condensate of bosonic Cooper pairs.The results program that neutron scattering experiments in exceptionally high magnetic fields can be utilized to check out previously unknown regions of matter, in specific correlated phases of many-body systems.
Through experiments at the BER II neutron source and its High-Field Magnet, researchers have found brand-new quantum states in the product SrCu2( BO3) 2 under severe magnetic fields. Identifying a spin-nematic stage that resembles the condensation of bosonic Cooper sets, this study highlights the energy of neutron scattering in checking out unidentified aspects of quantum materials, providing insights into complicated many-body systems under conditions of strong frustration. Credit: SciTechDaily.comNew states of order can arise in quantum magnetic materials under electromagnetic fields. A global group has now gained brand-new insights into these unique states of matter through experiments at the Berlin neutron source BER II and its High-Field Magnet. BER II served science until the end of 2019 and has considering that been closed down. Arise from information at BER II are still being released.” We measured in November 2019, our experiment was one of the very last ones performed on the High-Field Magnet at BER,” Dr. Ellen Fogh mentions. The physicist leads a group at the Laboratory of Quantum Magnetism at the Ecole Polytechnique Fédérale de Lausanne (EPFL) and has now published intriguing new insights in quantum materials obtained in partnership with colleagues from Japan, Qatar, and Switzerland.” Many impacts in matter only end up being visible under severe conditions, i.e. temperatures near no kelvin and magnetic fields above 20 Tesla,” she states. The ideal place to examine these results was at the neutron source BER II, where an HZB group has set up a distinct High-Field Magnet, rising to nearly 26 Teslas.Schematic illustration of a 2D spin-lattice with orthogonal orientation of spin pairs. Bound pair of magnons are represented by the red/blue and green pinwheels. Credit: EPFLChallenges in Data Interpretation” The examination took a great deal of time,” she says. This is due to the fact that the neutron scattering information do not instantly offer a picture, however need to be analyzed. This requires persuading theoretical models. “We played a game of ping-pong with a group of theorists, now we have some really fascinating outcomes.” Fogh and team evaluated samples of SrCu2( BO3) 2– a model system for perfect disappointment in a two-dimensional (2D) spin system. It consists of spin sets that are arranged orthogonally on a square lattice and affect each other in various ways. This “ideally disappointed” geometry causes numerous non-traditional effects, which are described in regards to entangled quantum states and their excitations (magnons). Magnetic order in such materials is typically referred to as Bose-Einstein Condensation (BEC) of magnons.Physicists in front of the High-Field Magnet at BER II during one of the last measurements. A few of the team members did not add to this paper (ambient pressure) however to a next publication on the behaviour of the model system under high pressure. Names from delegated right: Koji Munakata, Kazuhisa Kakurai, Gaétan Giriat, Luc Testa, Jana Pásztorová, Ellen Fogh and Henrik M. Rønnow. Credit: EPFL/HZB” We wished to discover whether this magnon BEC likewise happens in our design system at high electromagnetic fields, or whether there is an alternative system,” states Fogh. The neutron scattering experiment at the High-Field Magnet of BER II was preferably fit for this function: “We were able to measure spin excitations of SrCu2( BO3) 2 as much as 25.9 T and reproduce the speculative spectra with high accuracy using theoretical designs.” The experiments happened at ambient pressure and temperature levels close to outright no, at 200 millikelvin.The analysis and interpretation of the measurement data shows that a spin-nematic phase is formed under these very high electromagnetic fields. In location of single magnons, it is bound pairs of magnons condensing in this stage. There is even an analogy to superconductivity, recommending that the spin-nematic phase in SrCu2( BO3) 2 is best understood as a condensate of bosonic Cooper pairs.The results show that neutron scattering experiments in very high electromagnetic fields can be used to explore previously unknown areas of matter, in particular correlated stages of many-body systems. “Under conditions of strong aggravation and regulated extremes, many brand-new states and orders can still be found,” concludes Fogh.Reference: “Field-induced bound-state condensation and spin-nematic phase in SrCu2( BO3) 2 revealed by neutron spreading approximately 25.9 T” by Ellen Fogh, Mithilesh Nayak, Oleksandr Prokhnenko, Maciej Bartkowiak, Koji Munakata, Jian-Rui Soh, Alexandra A. Turrini, Mohamed E. Zayed, Ekaterina Pomjakushina, Hiroshi Kageyama, Hiroyuki Nojiri, Kazuhisa Kakurai, Bruce Normand, Frédéric Mila and Henrik M. Rønnow, 10 January 2024, Nature Communications.DOI: 10.1038/ s41467-023-44115-z.
