English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Exotic magnetism and superconductivity in Ge-substituted CeCu2Si2: A Cu NQR study

Kawasaki, Y., Ishida, K., Obinata, K., Tabuchi, K., Kashima, K., Kitaoka, Y., et al. (2002). Exotic magnetism and superconductivity in Ge-substituted CeCu2Si2: A Cu NQR study. Physical Review B, 66(22): 224502, pp. 224502-224502. doi:10.1103/PhysRevB.66.224502.

Item is

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Kawasaki, Y., Author
Ishida, K., Author
Obinata, K., Author
Tabuchi, K., Author
Kashima, K., Author
Kitaoka, Y., Author
Trovarelli, O.1, Author              
Geibel, C.2, Author              
Steglich, F.3, Author              
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              
3Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              

Content

show
hide
Free keywords: -
 Abstract: We report Cu NQR results on Ge-doped heavy-fermion superconductors CeCu2(Si1-xGex)(2) (0< x≦0.2) and compare with previous results on Ce0.99Cu2.02Si2 (x=0). Once only 1% Ge is substituted for Si to expand the lattice, an antiferromagnetic (AFM) order sets in at T-N&SIM;0.7 K, followed by the onset of superconductivity at T-c=0.5 K. The sudden emergence of AFM order due to the slight Ge doping reinforces that an exotic magnetic phase at x=0 is in fact a marginal AFM state where slowly fluctuating AFM waves propagate over a long distance. The appearance of internal fields throughout the sample that is deduced from the NQR spectral shape below T-N, excludes the presence of phase segregation between the superconducting (SC) and the AFM phases in the coexistent state below T-c. The 1/T-1 result does not show significant reduction below T-c, followed by a T1T=const behavior. This indicates that the SC phase is in a gapless regime, dominated by magnetic excitations due to the coexistence of AFM and SC phase. As Ge content increases, T-N is progressively increased, while T-c is steeply decreased. As a result of the suppression of the slowly fluctuating AFM waves in the samples with more than x=0.06, their magnetic properties above T-N progressively change to those in a localized regime as observed in CeCu2Ge2. The exotic interplay between magnetism and superconductivity in 0≦x<0.06 is discussed in the context of a SO(5) theory that unifies superconductivity and antiferromagnetism.

Details

show
hide
Language(s): eng - English
 Dates: 2002-12-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 17457
ISI: 000180279000067
DOI: 10.1103/PhysRevB.66.224502
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Physical Review B
  Alternative Title : Phys. Rev. B
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 66 (22) Sequence Number: 224502 Start / End Page: 224502 - 224502 Identifier: ISSN: 1098-0121