77Se and 63Cu NMR studies of the electronic correlations in CuxTiSe2 (x = 0.05, 0.07)

L L Lumata; K Y Choi; J S Brooks; A P Reyes; P L Kuhns; G Wu; X H Chen

doi:10.1088/0953-8984/22/29/295601

77Se and 63Cu NMR studies of the electronic correlations in CuxTiSe2 (x = 0.05, 0.07)

J Phys Condens Matter. 2010 Jul 28;22(29):295601. doi: 10.1088/0953-8984/22/29/295601. Epub 2010 Jun 28.

Authors

L L Lumata¹, K Y Choi, J S Brooks, A P Reyes, P L Kuhns, G Wu, X H Chen

Affiliation

¹ Department of Physics, Florida State University, Tallahassee, FL 32310, USA. [email protected]

PMID: 21399313
DOI: 10.1088/0953-8984/22/29/295601

Abstract

We report a (77)Se and (63)Cu nuclear magnetic resonance (NMR) investigation on the charge-density-wave (CDW) superconductor Cu(x)TiSe(2) (x = 0.05 and 0.07). At high magnetic fields where superconductivity is suppressed, the temperature dependence of (77)Se and (63)Cu spin-lattice relaxation rates 1/T(1) follow a linear relation. The slope of (77)Se 1/T(1) versus T increases with the Cu doping. This can be described by a modified Korringa relation which suggests the significance of electronic correlations and the Se 4p- and Ti 3d-band contribution to the density of states at the Fermi level in the studied compounds.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.