RT Journal Article
T1 Infrared study of the magnetostructural phase transition in correlated CrN
A1 Ebad-Allah, Jihaan
A1 Kugelmann, B.
A1 Rivadulla Fernández, José Francisco
A1 Kuntscher, Christine
K1 Magnetic phase transitions
K1 Specific phase transitions
K1 Nitrides
K1 Infrared spectroscopy
K1 Condensed Matter
K1 Materials Physics
AB We report on the pressure and temperature dependence of the electronic and vibrational properties of polycrystalline CrN studied by optical transmission and reflection measurements over the frequency range 0.012–2.48 eV. The optical conductivity spectrum of CrN at ambient conditions shows a phonon mode at ≈55meV with a shoulder at ≈69meV, a pronounced midinfrared absorption band centered at 123±2meV, and a high-energy absorption band at ≈1.5eV. The absorption bands are discussed in terms of the charge-transfer insulator picture. Following the reflectance spectrum with increasing pressure, the activation of an additional phonon mode above 0.6 GPa indicates the occurrence of a pressure-induced structural phase transition. Furthermore, the absorption spectrum exhibits significant changes in the far-infrared range with decreasing temperature: The phonon mode shows a sudden broadening followed by a splitting below 270 K. These changes observed under pressure or while cooling down can be associated with the magnetostructural phase transition reported previously
PB APS Physics
SN 2469-9950
YR 2016
FD 2016
LK http://hdl.handle.net/10347/17030
UL http://hdl.handle.net/10347/17030
LA eng
NO Ebad-Allah, J., Kugelmann, B., Rivadulla, F., & Kuntscher, C. (2016). Infrared study of the magnetostructural phase transition in correlated CrN. Physical Review B, 94(19). doi: 10.1103/physrevb.94.195118
NO We gratefully acknowledge the financial support from the Federal Ministry of Education and Research (BMBF), Germany, through Grant No. 05K13WA1 (Verbundprojekt 05K2013, Teilprojekt 1, PT-DESY), and the MINECO-spain through Project No. MAR2013-44673-R
DS Minerva
RD 28 abr 2026