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High-Tc Ferroelectricity Emerging from Magnetic Degeneracy in Cupric Oxide (Articolo in rivista)
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- High-Tc Ferroelectricity Emerging from Magnetic Degeneracy in Cupric Oxide (Articolo in rivista) (literal)
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- 2011-01-01T00:00:00+01:00 (literal)
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- 10.1103/PhysRevLett.106.026401 (literal)
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Gianluca Giovannetti (1,2); Sanjeev Kumar (3,4); Alessandro Stroppa (5); Jeroen van den Brink (3); Silvia Picozzi (1); José Lorenzana (2) (2011)
High-Tc Ferroelectricity Emerging from Magnetic Degeneracy in Cupric Oxide
in Physical review letters (Print)
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- Gianluca Giovannetti (1,2); Sanjeev Kumar (3,4); Alessandro Stroppa (5); Jeroen van den Brink (3); Silvia Picozzi (1); José Lorenzana (2) (literal)
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Title: Comment on \"High-T-c Ferroelectricity Emerging from Magnetic Degeneracy in Cupric Oxide\" Reply
Author(s): Giovannetti, Gianluca; Kumar, Sanjeev; Stroppa, Alessandro; et al.
Source: PHYSICAL REVIEW LETTERS Volume: 107 Issue: 23 Article Number: 239702 DOI: 10.1103/PhysRevLett.107.239702 Published: NOV 29 2011
Title: Comment on \"High-T-c Ferroelectricity Emerging from Magnetic Degeneracy in Cupric Oxide\"
Author(s): Rocquefelte, Xavier; Schwarz, Karlheinz; Blaha, Peter
Source: PHYSICAL REVIEW LETTERS Volume: 107 Issue: 23 Article Number: 239701 DOI: 10.1103/PhysRevLett.107.239701 Published: NOV 29 2011 (literal)
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- 1 Consiglio Nazionale delle Ricerche CNR-SPIN L'Aquila, Italy
2 ISC-CNR, Dipartimento di Fisica, Università \"La Sapienza\", Piazzale Aldo Moro 5, Roma, Italy
3 Institute for Theoretical Solid State Physics, IFW Dresden, 01171 Dresden, Germany
4 Indian Institute of Science Education and Research Mohali, MGSIPAP Complex, Sector 26, Chandigarh 160019, India
5 CNISM- Department of Physics, University of L'Aquila, Via Vetoio 10, 67010 Coppito, L'Aquila, Italy (literal)
- Titolo
- High-Tc Ferroelectricity Emerging from Magnetic Degeneracy in Cupric Oxide (literal)
- Abstract
- Cupric oxide is multiferroic at unusually high temperatures. From density functional calculations we find that the low-T magnetic phase is paraelectric, and the higher-T one is ferroelectric with a size and direction of polarization in good agreement with experiments. By mapping the ab initio results on to an effective spin model, we show that the system has a manifold of almost degenerate ground states. In the high-T magnetic state noncollinearity and inversion symmetry breaking stabilize each other via the Dzyaloshinskii-Moriya interaction. This leads to an unconventional mechanism for multiferroicity, with the particular property that nonmagnetic impurities enhance the effect. (literal)
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