Effects of electron irradiation on YBa[Formula: see text]CU[Formula: see text]0[Formula: see text] superconductor

Legris, Alexandre; Rullier‐Albenque, F.; Radeva, E.; Léjay, P.

doi:10.1051/jp1:1993203

Cited by 70 publications

(42 citation statements)

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“…It can be easily observed that the contributions of both atoms also increase with the incident energy, having a higher weight in the total oxygen atoms at low energies and those of copper at high energies. This result is consistent with evidences observed previously [4,27,28]. It is possible to see that for energies below 3.0 MeV the contribution comes essentially from the oxygen atoms, being more than 97% for energies smaller than 1.0 MeV.…”

Section: The Dpa Distributionssupporting

confidence: 93%

“…3. It is easy to see that the contribution from the yttrium and barium atoms to the total is quite small in the studied energy range, being practically worthless and maybe not decisive in the possible provoked changes [4,16]; they are only of about 11% (Y) and 24% (Ba) for 15 MeV. Therefore, the biggest contribution to the total comes from the Cu-O 2 planar sites, being 100% for low energies and also dominating at high energies, with about 65% for 15 MeV.…”

Section: The Dpa Distributionsmentioning

confidence: 96%

“…At present, one of the most interesting materials, due to its applications in most of the fields of science and technology, is the high temperature superconductors (HTS) [1]. Copper oxide superconductors have been found to be very sensitive to damage caused by irradiation with highly energetic particles [2][3][4][5][6][7][8][9][10][11] and also with gamma radiation [12][13][14][15][16][17][18][19]. Fast neutron fluency and displacement per atom (dpa) have been used as exposure parameters for predicting material property changes.…”

Section: Introductionmentioning

confidence: 99%

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Displacement per atom calculation in YBCO superconductors through Monte Carlo simulation

Piñera

Cruz

Leyva

et al. 2007

Nuclear Instruments and Methods in Physics Research Section B:

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Section: The Dpa Distributionssupporting

confidence: 93%

Section: The Dpa Distributionsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Displacement per atom calculation in YBCO superconductors through Monte Carlo simulation

Piñera

Cruz

Leyva

et al. 2007

Nuclear Instruments and Methods in Physics Research Section B:

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“…They are labelled with respect to their critical temperatures measured at the mid-point of the resistive transition: two underdoped samples UD57 and UD85, an optimally doped sample OPT93.6 and a slightly overdoped one OD92.5, corresponding to oxygen contents of approximately 6.54, 6.8, 6.91 and 6.95 respectively. Some of these samples have been irradiated by electrons at low T , which allows us to introduce a well controlled concentration of defects in the CuO 2 planes [9].…”

Section: Methodsmentioning

confidence: 99%

Superconducting fluctuations and pseudogap in high-T_ccuprates

Rullier‐Albenque

Alloul

2012

EPJ Web of Conferences

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Abstract. Large pulsed magnetic fields up to 60 Tesla are used to suppress the contribution of superconducting fluctuations (SCF) to the ab-plane conductivity above T c in a series of YBa 2 Cu 3 O 6+x . These experiments allow us to determine the field H ′ c (T ) and the temperature T ′ c above which the SCFs are fully suppressed. A careful investigation near optimal doping shows that T ′ c is higher than the pseudogap temperature T ⋆ , which is an unambiguous evidence that the pseudogap cannot be assigned to preformed pairs. Accurate determinations of the SCF contribution to the conductivity versus temperature and magnetic field have been achieved. They can be accounted for by thermal fluctuations following the Ginzburg-Landau scheme for nearly optimally doped samples. A phase fluctuation contribution might be invoked for the most underdoped samples in a T range which increases when controlled disorder is introduced by electron irradiation. Quantitative analysis of the fluctuating magnetoconductance allows us to determine the critical field H c2 (0) which is found to be be quite similar to H ′ c (0) and to increase with hole doping. Studies of the incidence of disorder on both T ′ c and T ⋆ allow us to to propose a three dimensional phase diagram including a disorder axis, which allows to explain most observations done in other cuprate families.

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“…The argument was very simple again. Obviously the NMR were broadened in alloys, due to the Friedel oscillation of the charge densities around impurities, which induced microscopic differences between the Knight shifts of nearneighbour nuclear sites [6][7][8][9]. This decoupling of the NMR frequencies of neighbouring sites could be eliminated in a spin echo experiment, so that the remaining exchange interaction J 12 appeared in the spin echo envelope as a periodic oscillation [5].…”

Section: Phd and Experimental Educationmentioning

confidence: 99%

From Friedel Oscillations and Kondo Effect to the Pseudogap in Cuprates

Alloul

2012

J Supercond Nov Magn

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Abstract. One of the great achievements performed by Jacques Friedel in France has been to promote experimental activities on the electronic properties in condensed matter physics, which has led him, among others, to be an active promoter of the up-rise of the "Laboratoire de Physique des Solides" (LPS). I have had the chance to be involved in this process in the early days and to create a Nuclear Magnetic Resonance (NMR) group which remains active nowadays. Among various other scientific activities, I have performed some work on Kondo effect in the 1970's which has allowed me to enlighten the real interest of the NMR probe as a local experimental technique to visualize the perturbation brought by impurities in normal metals. These experiments were of course driven by my strong exposure to J. Friedel's education on charge and spin density oscillations in metals. This work has been also my first personal contact with correlated electron physics, a field in which I have been involved for years particularly since the discovery of high T c cuprates (HTSC). I recall that the early NMR experiments done in these systems have given evidence for the existence of strong electronic correlations and established the occurrence of the "pseudogap", on which I have initially had some exchanges with J. Friedel. The pseudogap, occurring below a temperature T*, has during the last twenty years raised endless discussions about the incidence of correlations on superconductivity. Many researchers are still advocating today that the pseudogap is due to the existence of preformed pairs above T c . I shall show that its robustness to impurities and disorder that we evidenced from the early days rather suggested that it results from a competing order of the correlated state. This is apparently better accepted nowadays, although various distinct ordered states detected below T* are not yet understood. The short reviews of the work done on Kondo effect and on the cuprates in Orsay allow me to enlighten the importance of the initial choices done by J. Friedel for the LPS. I also underline the large contrast between the scientific behaviours which prevailed between these two periods of scientific activity. This is not only ascribed to the discovery of the HTSC but also to the changes in publication policies and to the modification of evaluation procedures, all this being driven by the advent of information technologies. I suggest that these changes might have a negative incidence, in my opinion, on the research and education system, at least in our field of science.

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Effects of electron irradiation on YBa[Formula: see text]CU[Formula: see text]0[Formula: see text] superconductor

Cited by 70 publications

References 0 publications

Displacement per atom calculation in YBCO superconductors through Monte Carlo simulation

Displacement per atom calculation in YBCO superconductors through Monte Carlo simulation

Superconducting fluctuations and pseudogap in high-T_ccuprates

From Friedel Oscillations and Kondo Effect to the Pseudogap in Cuprates

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Effects of electron irradiation on YBa[Formula: see text]CU[Formula: see text]0[Formula: see text] superconductor

Cited by 70 publications

References 0 publications

Displacement per atom calculation in YBCO superconductors through Monte Carlo simulation

Displacement per atom calculation in YBCO superconductors through Monte Carlo simulation

Superconducting fluctuations and pseudogap in high-Tccuprates

From Friedel Oscillations and Kondo Effect to the Pseudogap in Cuprates

Contact Info

Product

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Superconducting fluctuations and pseudogap in high-T_ccuprates