Journal ArticleDOI
Unusual metal-like state in HTSC and CMR oxides
TLDR
In this paper, the effect of disorder on Bi-2212 type high Tc superconducting and LCMO type CMR oxide materials has been investigated and results have been discussed in the light of their intrinsic granular nature.Abstract:
Present report deals with the effect of disorder on Bi-2212 type high Tc superconducting and LCMO type CMR oxide materials. Ion irradiation (50 MeV Li3+ beam) creates high level of disorder in the superconducting system and as a result increase of room temperature resistivity (ρ300) has been observed. Radiation induced point defects cause an increased dρ/dT in the metal-like regime of Bi-2212. Similar increase of dρ/dT in the FM (ferromagnetic and metal-like) state has also been found in LCMO system. Enhancement of metal-like behavior is unusual in the sense that a simultaneous decrease of Tmi (metal–insulator transition temperature for LCMO) or Tc (superconducting transition temperature for Bi-2212) due to irradiation has also been observed. Effect of the defects incorporated by other means like variation of heat treatment and ion irradiation has been investigated for a better understanding on the electrical transport in these complex materials. Results have been discussed in the light of their intrinsic granular nature.read more
Citations
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Correlation between structural and transport properties of electron beam irradiated PrMnO3 compounds
Benedict Christopher,Ashok Rao,B.S. Nagaraja,K. Shyam Prasad,Gunadhor S. Okram,Ganesh Sanjeev,Vikash Chandra Petwal,Vijay Pal Verma,Jishnu Dwivedi,P. Poornesh +9 more
TL;DR: In this article, the structural, electrical, magnetic, and thermal properties of electron beam (EB) irradiated PrMnO3 manganites were investigated using X-ray diffraction data.
Journal ArticleDOI
La1−xCaxMnO3:Ag0.2 (0.25 ≤ x ≤ 0.31) ceramics with high temperature coefficient of resistivity under magnetic field
TL;DR: In this article, a polycrystalline ceramic La1−xCaxMnO3:Ag0.2 was fabricated by sol-gel and solid-phase doping methods, and subsequently vast TCR was obtained in the magnetic field for ceramic with x = 0.2.
Journal ArticleDOI
La0·7Ca0.3−xSrxMnO3:Ag0.2 (0.0165 ≤ x ≤ 0.1) ceramics with large and stable TCR in different magnetic field environments
TL;DR: In this paper, the peak temperature coefficient of resistivity and resistivity (ρ) were observed across all ceramic samples when the mol% of strontium (Sr) content was adjusted.
Journal ArticleDOI
Electrical, thermal and magnetic studies on 7.5 MeV electron beam irradiated PrCoO3 polycrystalline samples
Benedict Christopher,Ashok Rao,Utpal Deka,Shyam Prasad K,Gunadhor S. Okram,Ganesh Sanjeev,Vikash Chandra Petwal,Vijay Pal Verma,Jishnu Dwivedi +8 more
TL;DR: The study of electronic and magnetic properties of electron beam (EB) irradiated PrCoO3 manganites is presented in this paper, where small polaron hopping model is appropriately employed to investigate the semiconducting nature of the pristine and EB irradiated samples.
References
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Book
Electronic processes in non-crystalline materials
TL;DR: The Fermi Glass and the Anderson Transition as discussed by the authorsermi glass and Anderson transition have been studied in the context of non-crystalline Semiconductors, such as tetrahedrally-bonded semiconductors.
Journal ArticleDOI
Low temperature magnetoresistance and the magnetic phase diagram of La1-xCaxMnO3.
TL;DR: An unexpectedly large magnetoresistance is seen at low temperatures in the FM phase, and is largely attributed to unusual domain wall scattering.
Journal ArticleDOI
Percolative phase separation underlies colossal magnetoresistance in mixed-valent manganites
Masatomo Uehara,Masatomo Uehara,Shigeo Mori,Shigeo Mori,Shigeo Mori,Cheng-Hsuan Chen,Cheng-Hsuan Chen,Sang-Wook Cheong,Sang-Wook Cheong,Sang-Wook Cheong +9 more
TL;DR: In this article, it was shown that the magnetoresistive response increases dramatically when the Curie temperature (T C) is reduced, and that the massive magnetoresistance in low-T C systems can be explained by percolative transport through the ferromagnetic domains; this depends sensitively on the relative spin orientation of adjacent magnetoric domains which can be controlled by applied magnetic fields.
BookDOI
Colossal magnetoresistance, charge ordering and related properties of manganese oxides
C. N. R. Rao,B Raveau +1 more
TL;DR: A review of the topics of colossal magnetoresistance, charge ordering and related phenomena exhibited by oxides, and contributions covering the present status of the subject can be found in this paper,.
Journal ArticleDOI
Imaging the granular structure of high-Tc superconductivity in underdoped Bi2Sr2CaCu2O8+x
Kristine Lang,Vidya Madhavan,Jennifer Hoffman,Eric Hudson,Hiroshi Eisaki,S. Uchida,J. C. Davis +6 more
TL;DR: In this article, the spatial interrelationships between STM tunneling spectra in underdoped Bi2Sr2CaCu2O8+x were investigated and it was shown that the electronic structure can be divided into 3nm diameter domains with superconducting characteristics and local energy gap delta 50(2.5) meV.