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Phys. Rev. B 75, 060403(R) (2007) [4 pages]

Competing magnetic fluctuations in Sr3Ru2O7 probed by Ti doping

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J. Hooper1, M. H. Fang2, M. Zhou1, D. Fobes1, N. Dang1, Z. Q. Mao1,*, C. M. Feng2, Z. A. Xu2, M. H. Yu3, C. J. O’Connor3, G. J. Xu4, N. Andersen4, and M. Salamon5
1Department of Physics, Tulane University, New Orleans, Louisiana 70118, USA
2Department of Physics, Zhejiang University, Hangzhou 310027, China
3Advanced Materials Research Institute, University of New Orleans, New Orleans, Louisiana 70148, USA
4Materials Research Department, Risø National Laboratory, Frederiksborgvej 399, DK 4000 Roskilde, Denmark
5Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA

Received 21 December 2006; published 7 February 2007

We report the effect of nonmagnetic Ti4+ impurities on the electronic and magnetic properties of Sr3Ru2O7. Small amounts of Ti suppress the characteristic peak in magnetic susceptibility near 16 K and result in a sharp upturn in specific heat. The metamagnetic quantum phase transition and related anomalous features are quickly smeared out by small amounts of Ti. These results provide strong evidence for the existence of competing magnetic fluctuations in the ground state of Sr3Ru2O7. Ti doping suppresses the low-temperature antiferromagnetic interactions that arise from Fermi surface nesting, leaving the system in a state dominated by ferromagnetic fluctuations.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.75.060403
DOI:
10.1103/PhysRevB.75.060403
PACS:
75.30.Kz, 71.27.+a, 75.40.Cx

*Electronic address: zmao@tulane.edu

 
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