Volume 96, Number 5, December 2011
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||22 November 2011|
Spin-singlet state of electrons in filled skutterudites
National Research Center “ Kurchatov Institute” - Kurchatov Square 1, Moscow 123182, Russia
2 Physik-Institut der Universität Zürich - CH-8057 Zürich, Switzerland
3 Department of Physics and Astronomy, University of British Columbia - Vancouver, British Columbia, Canada V6T 1Z1
4 Max-Planck-Institut für Chemische Physik fester Stoffe - Nöthnitzer Str. 40, 01187 Dresden, Germany, EU
5 Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory Upton, NY 11973, USA
Accepted: 17 October 2011
Muon spin rotation experiments have been performed on filled skutterudites PrOs4Sb12 and REPt4Ge12 (RE = La, Pr, Nd, Eu) over a temperature range 0.025–300 K in magnetic fields up to 7 T. An electron bound state is detected spectroscopically in filled skutterudites containing magnetic ions, both below and above the superconducting transition temperature Tc and both below and above the corresponding upper critical magnetic field Hc2, including the pseudogap region. This state is proposed to be a spin-singlet —an electron pair confined around the positive muon.
PACS: 74.20.Mn – Nonconventional mechanisms / 74.72.Kf – Pseudogap regime / 76.75.+i – Muon spin rotation and relaxation
© EPLA, 2011
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