Characteristics of nanostructure and electrical properties of Ti thin films as a function of substrate temperature and film thickness

Savaloni, Hadi; Khojier, K.; Alaee, M. S.

doi:10.1007/s10853-006-1340-9

Cited by 13 publications

(5 citation statements)

References 45 publications

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“…2d. Suppression of the carrier concentration as the thickness decreases has been observed in many different systems [39][40][41] . This phenomenon may be related to the disorder strength, surface state, band gap narrowing effect 40,42 , etc.…”

Section: Thickness-tuned Sit In a Zero Magnetic Fieldmentioning

confidence: 99%

Quantum Griffiths singularities in TiO superconducting thin films with insulating normal states

et al. 2019

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A superconductor-metal transition (SMT) with an unconventional diverging dynamic critical exponent was recently discovered, and it drew tremendous attention because this signature of a quantum Griffiths singularity (QGS) was thought to be a common characteristic of low-disorder crystalline superconductors. However, because the QGS was observed only in limited materials with metallic normal states, the question of whether the QGS exists in other superconducting systems is still unanswered. In this paper, a superconductor-insulator transition (SIT) is observed in TiO thin films with insulating normal states, which offers a more universal platform for investigating the QGS. A thickness-tuned SIT is obtained when the magnetic field is zero. Importantly, a magnetic field-tuned SIT with a diverging dynamic critical exponent, which is direct evidence of a QGS, is observed in TiO thin films with different thicknesses. By constructing a comprehensive phase diagram, it is demonstrated that the critical magnetic field H c tends to saturate as the temperature approaches 0 K, which is different from the upturn trend of H c observed in SMT systems and probably due to the weaker Josephson coupling of the locally ordered superconducting islands (rare regions) in a weakly insulating normal state background. The results extend the QGS scenario from only SMT systems to SIT systems, and they provide vital evidence that QGSs are common in crystalline superconducting thin films, which has possible applications in quantum-computing devices.

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Section: Thickness-tuned Sit In a Zero Magnetic Fieldmentioning

confidence: 99%

Quantum Griffiths singularities in TiO superconducting thin films with insulating normal states

et al. 2019

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“…The resistivity of thin films is affected by different parameters, such as surface scattering, impurities, grain boundary scattering, film surface roughness, and other parameters (Ref [25][26][27]. At low nitrogen gas flow, the number of nitrogen atoms bonding to the Cr atoms may be not enough and the remainders of Cr atoms act as donors and can provide free electrons.…”

Section: Electrical Resistivitymentioning

confidence: 99%

Study of Electrical, Mechanical, and Tribological Properties of CrN x Thin Films as a Function of Sputtering Conditions

Khojier

Savaloni

Zolghadr

et al. 2014

J. of Materi Eng and Perform

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The influences of chemical composition and deposition power on the electrical, mechanical, and tribological properties of sputtered chromium nitride (Cr-N) thin films that can be used for development of cryogenic temperature sensor are investigated. Cr-N thin films were deposited by DC reactive magnetron sputtering technique under various nitrogen gas flows (5-20 sccm) and deposition powers (200 and 250 W). Results of chemical composition showed that films produced with 5 and 10 sccm flow of nitrogen gas were substoichiometric, while at higher flows they were overstoichiometric. The surface morphology investigation showed that grains size and surface roughness increase with nitrogen gas flow, whereas deposition power has an inverse effect on both of these parameters. The electrical results demonstrated that the substoichiometric films had a positive temperature coefficient of resistivity, and the overstoichiometric films showed a negative temperature coefficient of resistivity. The films produced at higher deposition power of 250 W showed higher hardness and lower friction coefficient and scratch volume, while variation of nitrogen gas flow in the range of 5-20 sccm did not affect these properties, significantly.

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“…Many researchers have reported on obtaining TiO 2 thin films, using different methods [1][2][3][4][5][6][7]. These extensive studies on TiO 2 , have been due to the importance of these films in variety of applications.…”

Section: Introductionmentioning

confidence: 99%

Investigation of structural and optical properties of UHV deposited titanium thin films under thermal oxidation

Rafizadeh

2013

Optik

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Characteristics of nanostructure and electrical properties of Ti thin films as a function of substrate temperature and film thickness

Cited by 13 publications

References 45 publications

Quantum Griffiths singularities in TiO superconducting thin films with insulating normal states

Quantum Griffiths singularities in TiO superconducting thin films with insulating normal states

Study of Electrical, Mechanical, and Tribological Properties of CrN x Thin Films as a Function of Sputtering Conditions

Investigation of structural and optical properties of UHV deposited titanium thin films under thermal oxidation

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