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| 001 | 839914 | ||
| 005 | 20250129094204.0 | ||
| 024 | 7 | _ | |a 10.1103/PhysRevB.96.184301 |2 doi |
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| 100 | 1 | _ | |a Weber, T. |0 P:(DE-HGF)0 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Transverse acoustic phonon anomalies at intermediate wave vectors in MgV 2 O 4 |
| 260 | _ | _ | |a Woodbury, NY |c 2017 |b Inst. |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a Magnetic spinels (with chemical formula AX2O4, with X a 3d transition metal ion) that also have an orbital degeneracy are Jahn-Teller active and hence possess a coupling between spin and lattice degrees of freedom. At high temperatures, MgV2O4 is a cubic spinel based on V3+ ions with a spin S=1 and a triply degenerate orbital ground state. A structural transition occurs at TOO=63 K to an orbitally ordered phase with a tetragonal unit cell followed by an antiferromagnetic transition of TN=42 K on cooling. We apply neutron spectroscopy in single crystals of MgV2O4 to show an anomaly for intermediate wave vectors at TOO associated with the acoustic phonon sensitive to the shear elastic modulus (C11−C12)/2. On warming, the shear mode softens for momentum transfers near close to half the Brillouin zone boundary, but recovers near the zone center. High resolution spin-echo measurements further illustrate a temporal broadening with increased temperature over this intermediate range of wave vectors, indicative of a reduction in phonon lifetime. A subtle shift in phonon frequencies over the same range of momentum transfers is observed with magnetic fields. We discuss this acoustic anomaly in context of coupling to orbital and charge fluctuations. |
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| 773 | 1 | 8 | |a 10.1103/physrevb.96.184301 |b American Physical Society (APS) |d 2017-11-07 |n 18 |p 184301 |3 journal-article |2 Crossref |t Physical Review B |v 96 |y 2017 |x 2469-9950 |
| 773 | _ | _ | |a 10.1103/PhysRevB.96.184301 |g Vol. 96, no. 18, p. 184301 |0 PERI:(DE-600)2844160-6 |n 18 |p 184301 |t Physical review / B |v 96 |y 2017 |x 2469-9950 |
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