A quantum magnetic analogue to the critical point of water
| Autor: | Ekaterina Pomjakushina, Bruce Normand, Philippe Corboz, S. P. G. Crone, Stefan Wessel, Frédéric Mila, E. Fogh, J. Larrea Jiménez, M. E. Zayed, Andreas Honecker, Henrik M. Rønnow, R. Lortz, Andreas M. Läuchli, Lukas Weber, Ch. Rüegg, Kazimierz Conder |
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| Přispěvatelé: | Quantum Condensed Matter Theory (ITFA, IoP, FNWI), ITFA (IoP, FNWI), Faculteit der Geesteswetenschappen, Rheinisch-Westfälische Technische Hochschule Aachen (RWTH), Laboratoire de Physique Théorique et Modélisation (LPTM - UMR 8089), Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), Ecole Polytechnique Fédérale de Lausanne (EPFL) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Quantum phase transition
Phase transition Magnetism FOS: Physical sciences spin 01 natural sciences 010305 fluids & plasmas Condensed Matter - Strongly Correlated Electrons ground-state Critical point (thermodynamics) 0103 physical sciences universality [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] 010306 general physics Spin (physics) ComputingMilieux_MISCELLANEOUS Condensed Matter - Statistical Mechanics Phase diagram Physics Multidisciplinary model Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Statistical Mechanics (cond-mat.stat-mech) mean-field theory transition critical-behavior Magnetic field SPINTRÔNICA Ising model Condensed Matter::Strongly Correlated Electrons phases srcu2(bo3)(2) |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP Nature, 592, 370-375. Nature Publishing Group Nature Nature, Nature Publishing Group, 2021, 592 (7854), pp.370-375. ⟨10.1038/s41586-021-03411-8⟩ |
| ISSN: | 0028-0836 1476-4679 |
| DOI: | 10.1038/s41586-021-03411-8 |
| Popis: | At the familiar liquid-gas phase transition in water, the density jumps discontinuously at atmospheric pressure, but the line of these first-order transitions defined by increasing pressures terminates at the critical point, a concept ubiquitous in statistical thermodynamics. In correlated quantum materials, a critical point was predicted and measured terminating the line of Mott metal-insulator transitions, which are also first-order with a discontinuous charge density. In quantum spin systems, continuous quantum phase transitions (QPTs) have been investigated extensively, but discontinuous QPTs have received less attention. The frustrated quantum antiferromagnet SrCu$_2$(BO$_3$)$_2$ constitutes a near-exact realization of the paradigmatic Shastry-Sutherland model and displays exotic phenomena including magnetization plateaux, anomalous thermodynamics and discontinuous QPTs. We demonstrate by high-precision specific-heat measurements under pressure and applied magnetic field that, like water, the pressure-temperature phase diagram of SrCu$_2$(BO$_3$)$_2$ has an Ising critical point terminating a first-order transition line, which separates phases with different densities of magnetic particles (triplets). We achieve a quantitative explanation of our data by detailed numerical calculations using newly-developed finite-temperature tensor-network methods. These results open a new dimension in understanding the thermodynamics of quantum magnetic materials, where the anisotropic spin interactions producing topological properties for spintronic applications drive an increasing focus on first-order QPTs. 8+4 pages, 4+3 figures |
| Databáze: | OpenAIRE |
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