Journal
PHYSICAL REVIEW B
Volume 85, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.224304
Keywords
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Funding
- Deutsche Forschungsgemeinschaft (DFG) within the Transregional Collaborative Research Center TRR 80 (Augsburg-Munich)
- Research Unit FOR 960
- UA through the TRR80 graduate school
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-FG02-10ER46384]
- Grants-in-Aid for Scientific Research [22244041] Funding Source: KAKEN
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We report on the phonon spectrum of the spin-gapped quantum magnet Ba3Cr2O8 determined by infrared spectroscopy, and on specific heat measurements across the Jahn-Teller transition in magnetic fields up to 9 T. Phonon modes split below the Jahn-Teller transition, which occurs at T-JT = 70 K as detected by specific-heat measurements. The field-dependent specific heat data is analyzed in terms of the contributions from lattice, magnetic and orbital degrees of freedom. In contrast to the isostructural compound Sr3Cr2O8, our analysis does not indicate the existence of orbital fluctuations below the Jahn-Teller transition in Ba3Cr2O8.
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