Magnetoelastic coupling and spin contributions to entropy and thermal transport in biferroic yttrium orthochromite
- Indian Inst. of Technology Bombay, Mumbai (India)
- Raja Ramanna Center for Advanced Technology, Indore (India). Free Electron Laser Utilization Lab.
- Raja Ramanna Center for Advanced Technology, Indore (India). Free Electron Laser Utilization Lab.; Homi Bhabha National Inst., Mumbai (India)
- UGC-DAE Consortium for Scientific Research, Indore (India)
- Bhabha Atomic Research Center, Mumbai (India)
- Rutherford Appleton Lab., Chilton (United Kingdom). ISIS Facility
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Direct engineering of material properties through exploitation of spin, phonon, and charge-coupled degrees of freedom is an active area of development in materials science. However, the relative contribution of the competing orders to controlling the desired behavior is challenging to decipher. In particular, the independent role of phonons, magnons, and electrons, quasiparticle coupling, and relative contributions to the phase transition free energy largely remain unexplored, especially for magnetic phase transitions. Here, we study the lattice and magnetic dynamics of biferroic yttrium orthochromite using Raman, infrared, and inelastic neutron spectroscopy techniques, supporting our experimental results with first-principles lattice dynamics and spin-wave simulations across the antiferromagnetic transition at TN ~ 138 K. Spectroscopy data and simulations together with the heat capacity (Cp) measurements, allow us to quantify individual entropic contributions from phonons (0.01 ± 0.01kB atom-1), dilational (0.03 ± 0.01kB atom-1), and magnons (0.11 ± 0.01kB atom-1) across TN. High-resolution phonon measurements conducted in a magnetic field show that anomalous T-dependence of phonon energies across TN originates from magnetoelastic coupling. Additionally, phonon scattering is primarily governed by the phonon–phonon coupling, with little contribution from magnon–phonon coupling, short-range spin correlations, or magnetostriction effects; a conclusion further supported by our thermal conductivity measurements conducted up to 14 T, and phenomenological modeling.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1764475
- Alternate ID(s):
- OSTI ID: 23186453
- Journal Information:
- Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 12 Vol. 33; ISSN 0953-8984
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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