Evidence for a Magnetically Driven Superconducting Q Phase of CeCoIn5

M. Kenzelmann, S. Gerber, N. Egetenmeyer, J. L. Gavilano, Th. Strässle, A. D. Bianchi, E. Ressouche, R. Movshovich, E. D. Bauer, J. L. Sarrao, and J. D. Thompson
Phys. Rev. Lett. 104, 127001 – Published 25 March 2010

Abstract

We have studied the magnetic order inside the superconducting phase of CeCoIn5 for fields along the [100] crystallographic direction using neutron diffraction. We find a spin-density wave order with an incommensurate modulation Q=(q,q,1/2) and q=0.45(1), which within our experimental uncertainty is indistinguishable from the spin-density wave found for fields applied along [110]. The magnetic order is thus modulated along the lines of nodes of the dx2y2 superconducting order parameter, suggesting that it is driven by the electron nesting along the superconducting line nodes. We postulate that the onset of magnetic order leads to reconstruction of the superconducting gap function and a magnetically induced pair density wave.

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  • Received 30 November 2009

DOI:https://doi.org/10.1103/PhysRevLett.104.127001

©2010 American Physical Society

Authors & Affiliations

M. Kenzelmann1, S. Gerber2, N. Egetenmeyer2, J. L. Gavilano2, Th. Strässle2, A. D. Bianchi3, E. Ressouche4, R. Movshovich5, E. D. Bauer5, J. L. Sarrao5, and J. D. Thompson5

  • 1Laboratory for Developments and Methods, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
  • 2Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, CH-5232 Villigen, Switzerland
  • 3Département de Physique and Regroupement Québécois sur les Matériaux de Pointe, Université de Montréal, Montréal, Quebec H3C 3J7, Canada
  • 4CEA/Grenoble, INAC/SPSMS-MDN, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France
  • 5Condensed Matter and Thermal Physics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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Issue

Vol. 104, Iss. 12 — 26 March 2010

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