|
Home |
| Browse | |
|
|
Communities & Collections |
|
|
Issue Date |
|
|
Author |
|
|
Title |
|
|
Subject |
| Sign on to: | |
|
|
Receive email updates |
|
|
My APO authorized users |
|
|
Edit Profile |
|
|
|
|
|
About DSpace |
ANSTO Publications Online >
Journal Publications >
Journal Articles >
Please use this identifier to cite or link to this item:
http://apo.ansto.gov.au/dspace/handle/10238/2214
|
| Title: | Phonon anomalies in pure and underdoped R1-xKxFe2As2 (R=Ba, Sr) investigated by Raman light scattering. |
| Authors: | Rahlenbeck, M Sun, GL Sun, DL Lin, CT Keimer, B Ulrich, C |
| Keywords: | Raman Spectra Light Scattering Phonons Spin Waves Magnetic Moments Antiferromagnetic Materials |
| Issue Date: | Aug-2009 |
| Publisher: | American Physical Society |
| Citation: | Rahlenbeck, M., Sun, G. L., Sun, D. L., Lin, C. T., Keimer, B., & Ulrich, C. (2009). Phonon anomalies in pure and underdoped R1-xKxFe2As2 (R=Ba, Sr) investigated by Raman light scattering. Physical Review B, 80(6), 064509. |
| Abstract: | We present a detailed temperature-dependent Raman light scattering study of optical phonons in Ba1-xKxFe2As2 (x similar to 0.28, superconducting T-c similar to 29 K), Sr1-xKxFe2As2 (x similar to 0.15, T-c similar to 29 K), and nonsuperconducting BaFe2As2 single crystals. In all samples we observe a strong continuous narrowing of the Raman-active Fe and As vibrations upon cooling below the spin-density wave transition T-s. We attribute this effect to the opening of the spin-density wave gap. The electron-phonon linewidths inferred from these data greatly exceed the predictions of ab initio density-functional calculations without spin polarization, which may imply that local magnetic moments survive well above T-s. A first-order structural transition accompanying the spin-density wave transition induces discontinuous jumps in the phonon frequencies. These anomalies are increasingly suppressed for higher potassium concentrations. We also observe subtle phonon anomalies at the superconducting transition temperature T-c with a behavior qualitatively similar to that in the cuprate superconductors. © 2009, American Physical Society |
| URI: | http://dx.doi.org/10.1103/PhysRevB.80.064509 http://apo.ansto.gov.au/dspace/handle/10238/2214 |
| ISSN: | 1098-0121 |
| Appears in Collections: | Journal Articles |
Files in This Item: There are no files associated with this item. |
Items in APO are protected by copyright, with all rights reserved, unless otherwise indicated.
|
DSpace Software Copyright © 2002-2010 Duraspace - Feedback |