Effect of vortex-vortex interactions on the critical current density of single-crystalline MgB2 thin films

Pham, Duong; Jung, Soon‐Gil; Song, Kedong; Ranot, Mahipal; Lee, J.H.; Lee, N.H.; Kang, Won Nam

doi:10.1016/j.cap.2016.06.005

Cited by 5 publications

(1 citation statement)

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“…A smaller number of surface pinning centers poorly increase the J c below 5 T. In addition, our measurements indicate that highfield pinning centers are not efficient to improve the J c at low-and middle-magnetic-field regions. Pham et al [26] and Akyüz et al [5] show that in the MgB 2 material, intrinsic pinning centers in MgB 2 single crystals can exist. Their studies indicate that this type of pinning strongly anchored the vortex lattice [5].…”

Section: Resultsmentioning

confidence: 99%

Formation of High-Field Pinning Centers in Superconducting MgB2 Wires by Using High Hot Isostatic Pressure Process

Gajda

Morawski

Zaleski

et al. 2017

J Supercond Nov Magn

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This paper demonstrates the effects of hot isostatic pressure (HIP) on the structure and transport critical parameters of in situ MgB 2 wires without a barrier. Our results show that only HIP and nano-boron allow the formation of more high-field pinning centers, which lead to the increase in critical current density (J c ) at high applied magnetic fields. Nano-boron and annealing at a low pressure increase the J c in the low magnetic field. This indicates that nano-particles create more high-field pinning centers. In addition, the results show that nano-boron improves the connection between the grains. Scanning electron microscope results show that HIP increases the reaction rate between Mg and B, density, and homogeneity of the MgB 2 material. Additionally, HIP allows to create a structure with small grains and voids and eliminates the significance of the number of voids. High isostatic pressure allows to obtain high J c of 10 A/mm 2 (at 4.2 K) in 10 T and increases irreversible magnetic field (B irr ) and upper critical field (B c2 Measurements show that these wires have high critical temperature of 37 K.

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Section: Resultsmentioning

confidence: 99%