Comparison of Levitation Forces of Bulk MgB2 Superconductors Produced by Nano Boron and Carbon-Doped Nano Boron

Journal of Superconductivity and Novel Magnetism, 2014, Volume 27, Issue 10, pp 2241-2247

I. Duz ^{(1) (5),} S. B. Guner ^(2), O. Erdem ^{(6) ,}  I. Demir ⁽¹⁾,V. Kapucu ⁽¹⁾, Ş. Çelik ⁽²⁾, K. Ozturk ⁽¹⁾

, S. Hossain ⁽³⁾ , A. Gencer ⁽⁴⁾ , E. Yanmaz  ⁽¹⁾

1. Department of Physics, Faculty of Sciences, Karadeniz Technical University, 61080, Trabzon, Turkey and

2. Department of Physics, Faculty of Arts and Sciences, Pamukkale University, Denizli, Turkey and

3. Department of Physics, Faculty of Arts and Sciences, Recep Tayyip Erdogan University, Rize, Turkey and

4. Faculty of Education, Bayburt University, 69000, Bayburt, Turkey and

5. Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, New South Wales, 2522, Australia and

6. Department of Physics, Faculty of Sciences, Ankara University, Ankara, Turkey.

 

Abstract

MgB₂ bulk superconductors were prepared by hot press plus furnace heating method. Two types of boron powders were used, one is amorphous nano boron and the other is C-doped boron. Characteristics of superconductors were determined by XRD and resistance measurements. Systematic levitation force measurements were performed by using a modular system at low temperatures. These bulk superconductors showed around 9 N repulsive and 4 N attractive forces in the z-axis at 20 K at closest point to the cryostat lid which contains the MgB₂ superconductor. These values slightly decreased by increasing temperature to 24 and 28 K for both samples. Comparing two samples, nano boron MgB₂ showed slightly higher levitation force than C-doped MgB₂ although C-doped MgB₂ has higher attractive force value at the closest point. This situation points out that C-doped MgB₂ is much proper for attractive force applications (as guidance force) while the nanoboron MgB₂ sample is much appropriate for repulsive force (as levitation).

 

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