Coupled spin-lattice fluctuations in a compound with orbital degrees of freedom: the Cr based dimer system Sr3Cr2O8

Dirk Wulferding; Peter Lemmens; Kwang-Yong Choi; Vladimir Gnezdilov; Joachim Deisenhofer; Diana Quintero-Castro; A. T. M. Nazmul Islam; Bella Lake

doi:10.1103/PhysRevB.84.064419

Coupled spin-lattice fluctuations in a compound with orbital degrees of freedom: the Cr based dimer system Sr3Cr2O8

Strongly Correlated Electrons 2015-05-28 v1 Materials Science

Authors: Dirk Wulferding , Peter Lemmens , Kwang-Yong Choi , Vladimir Gnezdilov , Joachim Deisenhofer , Diana Quintero-Castro , A. T. M. Nazmul Islam , Bella Lake

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Abstract

We report on an extended fluctuation regime in the spin dimer system Sr3Cr2O8 based on anomalies in Raman active phonons and magnetic scattering. The compound has two characteristic temperatures, TS = 275 K, related to a Jahn-Teller transition with structural distortions and orbital ordering and a second, T*= 150 K, which is due to further changes in the orbital sector. Below TS quasielastic scattering marks strong fluctuations and in addition phonon anomalies are observed. For temperatures below T* we observe an exponential decrease of one phonon linewidth and determine a gap of the orbital excitations. At low temperatures the observation of two- and three-magnon scattering allows the determination of the spin excitation gap.

Keywords

spin dimer system Sr3Cr2O8 spin-lattice fluctuations orbital degrees of freedom Jahn-Teller transition Raman scattering magnon scattering

Cite

@article{arxiv.1105.2369,
  title  = {Coupled spin-lattice fluctuations in a compound with orbital degrees of freedom: the Cr based dimer system Sr3Cr2O8},
  author = {Dirk Wulferding and Peter Lemmens and Kwang-Yong Choi and Vladimir Gnezdilov and Joachim Deisenhofer and Diana Quintero-Castro and A. T. M. Nazmul Islam and Bella Lake},
  journal= {arXiv preprint arXiv:1105.2369},
  year   = {2015}
}

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7 pages, 4 figures, 1 table

Coupled spin-lattice fluctuations in a compound with orbital degrees of freedom: the Cr based dimer system Sr3Cr2O8

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