Orbital fluctuations and orbital order below the Jahn-Teller transition in Sr3Cr2O8

Details Orbital fluctuations and orbital order below the Jahn-Teller transition in Sr3Cr2O8 Orbital fluctuations and orbital order below the Jahn-Teller transition in Sr3Cr2O8

2010-11-15

arxiv.org/abs/1011.3314v2

Phys. Rev. B 83, 201102(R) (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.83.201102

We report on the magnetic and phononic excitation spectrum of Sr3Cr2O8 determined by THz and infrared (IR) spectroscopy, and electron spin resonance (ESR) measurements across the Jahn-Teller transition, which is detected by specific-heat measurements to occur at T_{JT} = 285 K. We identify the singlet-triplet excitations in the dimerized ground state and estimate the exchange couplings in the system. Moreover, ESR absorptions were observed up to T* = 120 K with a linewidth proportional to exp{-Delta/k_{B}T} and Delta/k_{B} = 388 K indicating a phonon-mediated spin relaxation via the excited orbital state of the Cr $e$ doublet in the orbitally ordered state. In contrast to the expected drastic change of the IR active phonons upon entering the low-symmetry Jahn-Teller distorted phase below T_{JT}, we find an extended regime T*

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