Electron–phonon coupling enhancement and displacive magnetostructural transition in SrCr2As2 under magneto-Raman spectroscopy
Here, a Raman spectroscopy study on high quality single crystals of SrCr2As2 (SCA) in the temperature T range 4 K < T < 300 K and high applied magnetic fields up to H = 9 T is presented. The chromium B1g phonon analysis reveals two anomalous shifts in the frequency, the first below T = 250 K at H = 0 T in the saturated AFM G-type order likely due to an enhanced electron–phonon coupling by the magnetic order, whereas the second anomaly occurs above H = 4 T at T = 4 K likely as a consequence of a magnetostructural displacive transition. Renormalization of the electronic Raman spectra in both studies reveals a decrease in the electronic density of states with decreasing T and increasing H, respectively, with consequent changes in the Fermi surface, which are intrinsically related to the observed anomalies.
- Research Organization:
- Ames Lab., Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; FAPESP
- Grant/Contract Number:
- AC02-07CH11358; 17833-03/2015
- OSTI ID:
- 1762691
- Report Number(s):
- IS-J-10,399; TRN: US2205898
- Journal Information:
- Journal of Physics. Condensed Matter, Vol. 33, Issue 10; ISSN 0953-8984
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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