Large Anisotropic Normal-State Magnetoresistance in Clean<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>MgB</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>Thin Films

Li, Qi; Liu, B. T.; Hu, Yufeng; Chen, J.; Gao, Hongjun; Shan, Lei; Wen, Hao; Pogrebnyakov, A. V.; Redwing, Joan M.; Xi, X. X.

doi:10.1103/physrevlett.96.167003

Cited by 66 publications

(57 citation statements)

References 25 publications

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“…For a multi-band superconductor, the transport behaviour at different bands may be affected by magnetic field individually and thus the MR is more commonly observed. The MgB 2 superconductor is a very good example, in which MR as large as 136% (at 45 K, 18 T) has been observed [30]. However, for a less clean sample, the scattering is strong and MR could be suppressed considerably.…”

Section: Resultsmentioning

confidence: 96%

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Superconductivity and normal state magnetoresistance in superconducting FeSe:Sb

Chu

Shao

et al. 2010

Sci. China Phys. Mech. Astron.

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We prepared a series of β-FeSe samples with a nominal composition of Fe 1.11 Se 1−x Sb x (0≤x≤0.5). The X-ray diffraction, transport and magnetic measurements were performed on these samples to investigate the structure, the superconducting properties and the normal state transport and magnetic properties. Although the X-ray diffraction data suggested that Sb atoms were not incorporated into the β-FeSe phase, the transport data showed observable changes of superconductivity, normal state resistivity and magnetoresistance. This was represented by the increase in the superconducting transition temperature and the upper critical field. Also, for the samples with a low level of Sb content, a clear decrease of the normal state resistivity and a substantial increase of the residual resistance ratio were observed. Furthermore, the samples showed a significant increase of the normal state magnetoresistance that appeared not to follow the Kohler's rule. The results were discussed in the frame of reduction of excess Fe at interstitial sites of β-FeSe.iron-based superconductor, superconductivity, magnetoresistance PACS: 74.25.Op,

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Section: Resultsmentioning

confidence: 96%

“…As for FeSe and other iron-based superconductors, it has also been confirmed that multiple bands contribute to the transport properties [29]. We try to fit the MR using a two-band model [30] which gives the relation…”

Section: Resultsmentioning

confidence: 97%

Superconductivity and normal state magnetoresistance in superconducting FeSe:Sb

Chu

Shao

et al. 2010

Sci. China Phys. Mech. Astron.

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“…It is known that the magnetoresistance (MR) is a very powerful tool to investigate the electronic scattering and the message of the Fermi surface. For example, in MgB 2 , a large magnetoresistance was found which is closely related to the multiband property 21,22 . Fig.…”

Section: Resultsmentioning

confidence: 98%

“…According to the Kohler's law 25 , MR at different temperatures can be scaled by the expression ∆ρ/ρ 0 = f (Hτ ) = F (H/ρ 0 ) with the assumption that scattering rate 1/τ (T ) ∝ ρ 0 (T ), here f and F represent some unknown functions. For MgB 2 , the Kohler's law is not obeyed because of the multiband property 21 . Here we tried the scaling based on the Kohler's law to the data from the single crystal (SC sample II), the result is shown in the inset of Fig.2(a).…”

Section: Resultsmentioning

confidence: 99%

Hall effect and magnetoresistance in single crystals ofNdFeAsO1−xFx(x=0<

et al. 2008

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Hall effect and magnetoresistance have been measured on single crystals of N dF eAsO1−xFx with x = 0 (Tc = 0 K) and x = 0.18 (Tc = 50 K). For the undoped samples, strong Hall effect and magnetoresistance with strong temperature dependence were found below about 150 K. The magnetoresistance was found to be as large as 30% at 15 K at a magnetic field of 9 T. From the transport data we found that the transition near 155 K was accomplished in two steps: first one occurs at 155 K which may be associated with the structural transition, the second one takes place at about 140 K which may correspond to the spin-density wave like transition. In the superconducting sample with Tc = 50 K, it is found that the Hall coefficient also reveals a strong temperature dependence with a negative sign. But the magnetoresistance becomes very weak and does not satisfy the Kohler's scaling law. These dilemmatic results (strong Hall effect and very weak magnetoresistance) prevent to understand the normal state electric conduction by a simple multiband model by taking account the electron and hole pockets. Detailed analysis further indicates that the strong temperature dependence of RH cannot be easily understood with the simple multi-band model either. A picture concerning a suppression to the density of states at the Fermi energy in lowering temperature is more reasonable. A comparison between the Hall coefficient of the undoped sample and the superconducting sample suggests that the doping may remove the nesting condition for the formation of the SDW order, since both samples have very similar temperature dependence above 175 K.

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“…Larger film thickness results in higher T c , lower ρ 0 , and higher RRR [44]. Li et al reported a large anisotropic normal-state magnetoresistance (∆ρ/ρ 0 =136% for the H ┴ ab plane at 18T) in clean MgB 2 thin films [45]. This is a direct result of the multiband nature of MgB 2 and the cleanness of the HPCVD films.…”

Section: Single-crystal Like Mgb 2 Thin Filmsmentioning

confidence: 89%

A review on the understanding and fabrication advancement of MgB₂thin and thick films by HPCVD

Ranot¹,

Duong²,

Bhardwaj³

et al. 2015

Progress in Superconductivity and Cryogenics

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MgB 2 thin films with superior superconducting properties are very promising for superconducting magnets, electronic devices and coated conductor electric power applications. A clear understanding of flux pinning mechanism in MgB 2 films could be a big aid in improving the performance of MgB 2 by the enhancement of J c . The fabrication advancement and the understanding of flux pinning mechanism of MgB 2 thin and thick films fabricated by using hybrid physical-chemical vapor deposition (HPCVD) are reviewed. The distinct kind of MgB 2 films, such as single-crystal like MgB 2 thin films, MgB 2 epitaxial columnar thick films, and a-axis-oriented MgB 2 films are included for flux pinning mechanism investigation. Various attempts made by researchers to improve further the flux pinning property and J c performance by means of doping in MgB 2 thin films by using HPCVD are also summarized.Keywords: MgB2 thin and thick films, HPCVD, flux pinning mechanism * Corresponding author: email: wnkang@skku.edu A review on the understanding and fabrication advancement of MgB2 thin and thick films by HPCVD CCs showed self-field J c values of the order of 10 7 A/cm 2 at 5 K as high as already obtained in MgB 2 thin films, however, J c decreases in response to an applied magnetic field [31,32]. Therefore, a complete understanding of the flux pinning mechanism could be a big aid in improving the performance of MgB 2 by the enhancement of J c , which is most important parameter in practical applications for an operation with low noise and lower power loss. The epitaxial MgB 2 thin films with uniform orientation of grains provide an ideal condition for investigating the vortex dynamics and flux pinning properties, in contrast to MgB 2 bulk system where grains are randomly orientated. In this article, we review the progress made in the last 14 years for the fabrication, understanding of flux pinning mechanism, and for improving the performance by doping in MgB 2 epitaxial thin and thick films by using HPCVD technique.

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Large Anisotropic Normal-State Magnetoresistance in CleanMgB2Thin Films

Cited by 66 publications

References 25 publications

Superconductivity and normal state magnetoresistance in superconducting FeSe:Sb

Superconductivity and normal state magnetoresistance in superconducting FeSe:Sb

Hall effect and magnetoresistance in single crystals ofNdFeAsO1−xFx(x=0<

A review on the understanding and fabrication advancement of MgB₂thin and thick films by HPCVD

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Large Anisotropic Normal-State Magnetoresistance in CleanMgB2Thin Films

Cited by 66 publications

References 25 publications

Superconductivity and normal state magnetoresistance in superconducting FeSe:Sb

Superconductivity and normal state magnetoresistance in superconducting FeSe:Sb

Hall effect and magnetoresistance in single crystals ofNdFeAsO1−xFx(x=0<

A review on the understanding and fabrication advancement of MgB2thin and thick films by HPCVD

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A review on the understanding and fabrication advancement of MgB₂thin and thick films by HPCVD