Magnetotransport Properties of CaTi_xRu_{1-x}O_3 (x=0, 0.07)

• Authors: A. Zorkovská , A. Baran , A. Feher , J. Šebek , E. Šantavá , I. Bradarić
• Languages of publication: EN

Abstracts

EN

Electrical resistance, transversal magnetoresistance and the Hall effect were studied on polycrystalline CaTi_xRu_{1-x}O_3 (x=0, 0.07) samples using a conventional Quantum Design PPMS-9 equipment in the temperature range 2-300 K and magnetic field up to 9 T. Substantial differences were found between the two samples: (i) opposite to the metallic character of CaRuO_3, the substituted sample has insulating-like electrical resistance;(ii) the magnetoresistance of the substituted sample changes the sign from negative to positive values with increasing temperature. The magnetoresistance of CaRuO_3 is negative, the sign reversal is induced by magnetic field and only at temperatures below 15 K, such a behaviour is predicted for clustered systems;(iii) the Hall voltage in pure CaRuO_3 also changes sign from negative to positive values above 35 K. This temperature coincides with the observed magnetic transition temperature, indicating that the magnetic state and the carrier character interrelate.

Keywords

EN

74.70.Pq   73.43.Qt   75.47.-m  

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 113
• Issue: 1
• Pages: 351-354

Dates

published

2008-01

received

2007-07-09

References

• 1. K. Yoshimura, T. Imai, T. Kiyama, K.R. Thurber, A.W. Hunt, K. Kosuge, Phys. Rev. Lett. 83, 4397 (1999)
• 2. T. He, R.J. Cava, Phys. Rev. B 63, 172403 (2001)
• 3. A. Zorkovská, A. Baran, I. Bradarić, I. Savić, J.Šebek, E.Šantavá, P. Svoboda, D. Marinčev, S. Kohout, H. Keller, A. Feher, J. Magn. Magn. Mater. 316, e699 (2007)
• 4. L. Klein, L. Antognazza, T.H. Geballe, M.R. Beasley, A. Kapitulnik, Phys. Rev. B 60, 1448 (1999)
• 5. F. Steglich, B. Buschinger, P. Gegenwart, M. Lohmann, R. Helfrich, C. Langhammer, P. Hellmann, L. Donnevert, S. Thomas, A. Link, C. Geibel, M. Lang, G. Sparn, W. Assmus, J. Phys., Condens. Matter 8, 9909 (1996)
• 6. X.R. Wang, S.C. Ma, X.C. Xie, Europhys. Lett. 45, 368 (1999)

Identifiers

DOI

10.12693/APhysPolA.113.351