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Growth and characterization of R(O,F)BiS2 (R = La, Ce, Pr, Nd) superconducting single crystals

100%

Nagao M.

Novel Superconducting Materials

2015

vol. 1

issue 1

R(O,F)BiS2 (R: La, Ce, Pr, Nd) superconducting single crystals with different F concentrations are grown using a CsCl/KCl flux. The obtained 1-2 mm-sized single crystals have a plate-like shape and are cleavable along the ab-plane. The crystal structure is tetragonal of space group P4/nmm (#129). The as-grown single crystals exhibit superconductivity at around 3–5 K. The superconducting transition temperature increases with decreasing the ionic radius of the R element. The superconducting anisotropies of the R(O,F)BiS2 single crystals are estimated to be 30–60 according to the effective mass model, whereas the anisotropies for Ce(O,F)BiS2 single crystals are 13–21. The c-axis transport measurements of a single crystal of Pr(O,F)BiS2 under a magnetic field parallel to the ab-plane reveal a “lock-in” state attributed to the Josephson vortex flow. Furthermore, the Ce(O,F)BiS2 single crystals exhibit a magnetic order at the temperature range of 5–7 K that apparently coexist with superconductivity below approximately 3 K.

Numerical Simulation of Directional Solidification Process of Single Crystal Ni- Based Superalloy Casting

86%

Sieniawski J., Szeliga D., Kubiak K.

Archives of Foundry Engineering

2017

vol. 17

issue 2

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1 Archives of Foundry Engineering

1 Novel Superconducting Materials

1 2017

1 2015

1 Kubiak K.

1 Nagao M.

1 Sieniawski J.

1 Szeliga D.

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Growth and characterization of R(O,F)BiS2 (R = La, Ce, Pr, Nd) superconducting single crystals

Numerical Simulation of Directional Solidification Process of Single Crystal Ni- Based Superalloy Casting