corner
corner
APS » Journals » Phys. Rev. B » Volume 79 » Issue 6
< Previous Article | Next Article >

Phys. Rev. B 79, 060510(R) (2009) [4 pages]

Suppression of antiferromagnetic spin fluctuations in the collapsed phase of CaFe2As2

Download: PDF (396 kB) Buy this article Export: BibTeX or EndNote (RIS)

D. K. Pratt1,2, Y. Zhao3, S. A. J. Kimber4, A. Hiess5, D. N. Argyriou4, C. Broholm3, A. Kreyssig1,2, S. Nandi1,2, S. L. Bud’ko1,2, N. Ni1,2, P. C. Canfield1,2, R. J. McQueeney1,2, and A. I. Goldman1,2
1Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, USA
2Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
3Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
4Helmholtz-Zentrum Berlin für Materialien und Energie, Glienicker Straße 100, 14109 Berlin, Germany
5Institut Laue-Langevin, 38042 Grenoble Cedex, France

Received 20 January 2009; published 27 February 2009

Inelastic neutron-scattering measurements of CaFe2As2 under applied hydrostatic pressure show that the antiferromagnetic spin fluctuations observed in the ambient pressure, paramagnetic, and tetragonal (T) phase are strongly suppressed, if not absent, in the collapsed tetragonal (cT) phase. These results are consistent with a quenched Fe moment in the cT phase and the strong decrease in resistivity observed upon crossing the boundary from the T to cT phases. The suppression or absence of static antiferromagnetic order and dynamic spin fluctuations in the nonsuperconducting cT phase supports the notion of a coupling between spin fluctuations and superconductivity in the iron arsenides.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.79.060510
DOI:
10.1103/PhysRevB.79.060510
PACS:
74.20.Mn, 75.30.Fv, 78.70.Nx
 
< Previous Article | Next Article >