Charge Transport and Magnetism in Eu_{1-x}Ca_{x}B_6

• Authors: V. Glushkov , M. Anisimov , I. Batko , M. Batkova , A. Bogach , S. Demishev , V. Filipov , K. Flachbart , A. Kuznetsov , I. Sannikov , N. Shitsevalova , N. Sluchanko
• Languages of publication: EN

Abstracts

EN

Transport, magnetic and thermal properties of substitutional solid solution Eu_{1 - x}Ca_{x}B_6 single crystals (0 ≤ x ≤ 0.244) have been studied at 1.8 ≤ T ≤ 300 K and in magnetic fields up to 8 T. Calcium doping is shown to result in a metal-insulator transition, which occurs at x_{MIT} ≈ 0.2. In vicinity of metal-insulator transition the effect of colossal magnetoresistance is found to be very sensitive to Ca content, the amplitude varying from Δ = [ ρ (0)- ρ (8T)]/ρ(8T) ≈1.4×10^2 to Δ ≈ 7.5 × 10^3 for 0.14 ≤ x ≤ 0.16. The analysis of magnetic contribution to heat capacity shows that a large amount of magnetic entropy ( ≈ 30%) releases in Eu_{0.845}Ca_{0.155}B_6 when moving from the Curie temperature T_{C} ≈ 5.5 K to the characteristic one T* ≈ 30 K. This observation as well as the large amplitude of low field colossal magnetoresistance effect and the deviation of magnetic susceptibility from the Curie-Weiss law detected for x = 0.155 compound in the interval T_{C} ≤ T ≤ T* seem to be associated with magnetic phase separation induced by Ca doping.

Keywords

EN

71.30.+h; 75.30.Cr; 75.40.-s; 75.47.Gk

Discipline

• 75.30.Cr: Saturation moments and magnetic susceptibilities
• 71.30.+h: Metal-insulator transitions and other electronic transitions
• 75.47.Gk: Colossal magnetoresistance
• 75.40.-s: Critical-point effects, specific heats, short-range order(for equilibrium properties near critical points, see 64.60.F-; for dynamical critical phenomena, see 64.60.Ht)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 118
• Issue: 5
• Pages: 891-892

Dates

published

2010-11

Contributors

author

V. Glushkov

• A.M. Prokhorov General Physics Institute of RAS, 38, Vavilov str., Moscow 119991 Russia
• Moscow Institute of Physics and Technology, 9, Institutskii per., Dolgoprudny, Moscow Region 141700, Russia

author

M. Anisimov

• Moscow Institute of Physics and Technology, 9, Institutskii per., Dolgoprudny, Moscow Region 141700, Russia

author

I. Batko

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovak Republic

author

M. Batkova

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovak Republic

author

A. Bogach

• A.M. Prokhorov General Physics Institute of RAS, 38, Vavilov str., Moscow 119991 Russia

author

S. Demishev

• A.M. Prokhorov General Physics Institute of RAS, 38, Vavilov str., Moscow 119991 Russia
• Moscow Institute of Physics and Technology, 9, Institutskii per., Dolgoprudny, Moscow Region 141700, Russia

author

V. Filipov

• I. Frantsevich Institute for Problems of Materials Science, NAS, 3, Krzhyzhanovsky str., Kiev 03680, Ukraine

author

K. Flachbart

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovak Republic

author

A. Kuznetsov

• Moscow Engineering Physics Institute, 31, Kashirskoe Shosse, Moscow 115409, Russia

author

I. Sannikov

• Moscow Engineering Physics Institute, 31, Kashirskoe Shosse, Moscow 115409, Russia

author

N. Shitsevalova

• I. Frantsevich Institute for Problems of Materials Science, NAS, 3, Krzhyzhanovsky str., Kiev 03680, Ukraine

author

N. Sluchanko

• A.M. Prokhorov General Physics Institute of RAS, 38, Vavilov str., Moscow 119991 Russia

References

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Identifiers

DOI

10.12693/APhysPolA.118.891