NMR study of strongly correlated electron systems

Y. Kitaoka, H. Tou, Guo-Qing Zheng, K. Ishida, K. Asayama, Tatsuo Kobayashi, A. Kohda, N. Takeshita, K. Amaya, Y. Onuki, G. Geibel, C. Schank, F. Steglich

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Various types of ground states in strongly correlated electron systems have been systematically investigated by means of NMR/NQR at low temperatures under high magnetic field and pressure. We focus on two well-known heavy-electron families, CeCu2X2 (X = Si and Ge) (Ce(122)) and UM2Al3 (M = Ni and Pd) (U(123)). The Cu NQR experiments on CeCu2X2 under high pressure indicate that the physical property of CeCu2Ge2 at high pressure, i.e. above the transition at 7.6 GPa from antiferromagnetic (AF) to superconductivity, are clearly related to tha CeCu2Si2 at ambient pressure. In addition to the H-T phase diagram established below 7 T, NMR and specific heat experiments on polycrystal CeCu2.05Si2 have revealed the presence of a new phase above 7 T. In a high-quality polycrystal of UPd2Al3 with a record high-Tc of 2 K at ambient pressure and the narrowest Al NQR line width, the nuclear-spin lattice relaxation rate, 27(1/T1) measured in zero field has been found to obey the T3 law down to 0.13 K, giving strong evidence that the energy gap vanishes along lines on the Fermi surface. Thus it seems that all heavy-electron superconductors exhibit lines of zero gap, regardless of their different magnetic properties.

Original languageEnglish
Pages (from-to)55-61
Number of pages7
JournalPhysica B: Condensed Matter
Volume206-207
Issue numberC
DOIs
Publication statusPublished - Feb 1 1995
Externally publishedYes

Fingerprint

Nuclear magnetic resonance
polycrystals
nuclear magnetic resonance
Electrons
Polycrystals
heat
electrons
spin-lattice relaxation
nuclear spin
Fermi surfaces
superconductivity
physical properties
phase diagrams
specific heat
Spin-lattice relaxation
Fermi surface
magnetic properties
Superconductivity
ground state
Linewidth

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Materials Science(all)

Cite this

NMR study of strongly correlated electron systems. / Kitaoka, Y.; Tou, H.; Zheng, Guo-Qing; Ishida, K.; Asayama, K.; Kobayashi, Tatsuo; Kohda, A.; Takeshita, N.; Amaya, K.; Onuki, Y.; Geibel, G.; Schank, C.; Steglich, F.

In: Physica B: Condensed Matter, Vol. 206-207, No. C, 01.02.1995, p. 55-61.

Research output: Contribution to journalArticle

Kitaoka, Y, Tou, H, Zheng, G-Q, Ishida, K, Asayama, K, Kobayashi, T, Kohda, A, Takeshita, N, Amaya, K, Onuki, Y, Geibel, G, Schank, C & Steglich, F 1995, 'NMR study of strongly correlated electron systems', Physica B: Condensed Matter, vol. 206-207, no. C, pp. 55-61. https://doi.org/10.1016/0921-4526(94)00365-3
Kitaoka, Y. ; Tou, H. ; Zheng, Guo-Qing ; Ishida, K. ; Asayama, K. ; Kobayashi, Tatsuo ; Kohda, A. ; Takeshita, N. ; Amaya, K. ; Onuki, Y. ; Geibel, G. ; Schank, C. ; Steglich, F. / NMR study of strongly correlated electron systems. In: Physica B: Condensed Matter. 1995 ; Vol. 206-207, No. C. pp. 55-61.
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