Effect of Co substitution on the thermal expansion of the high-Tc superconductor Y1Ba2Cu3Oy

Rao, Ashok; Prakash, Om; Das, Salila; Dheer, P.N.

doi:10.1016/0038-1098(95)80071-9

Cited by 7 publications

(11 citation statements)

References 38 publications

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“…One can observe that for Fe and Co doping, there is an increase in jump with doping content. Resistivity (mΩ-cm) Such a behavior has also been observed in YBaCuO system [3,4]. Figure 4 depicts the variation of jump in thermal expansion as a function of Zn content.…”

Section: Resultsmentioning

confidence: 60%

“…Further, in the former there is a structural transformation, on contrary no such transformation is seen in the latter [2]. Detailed thermal expansion studies have been carried out on pure as well as doped high temperature superconductors like YBaCuO [3,4]. These reports show that the all the pure superconducting compounds exhibit a jump in thermal expansion.…”

Section: Introductionmentioning

confidence: 95%

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Effect of Fe, Co, and Zn Substitution on Thermal Expansion of GdBa[sub 2]Cu[sub 3]O[sub 7]

Rao

2011

AIP Conference Proceedings

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Section: Resultsmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 95%

Effect of Fe, Co, and Zn Substitution on Thermal Expansion of GdBa[sub 2]Cu[sub 3]O[sub 7]

Rao

2011

AIP Conference Proceedings

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“…KNH 4 SO 4 is known to be orthorhombic with space group Pmcn. Its unit-cell dimensions are a = 5.8 Å, b = 10.1 Å, c = 7.5 Å and Z = 4 [14]; however, no detailed crystal structure has been reported for this compound. In the RbNH 4 SO 4 crystals, the phase-transition temperatures are 120 and 189 K [15,16].…”

Section: Introductionmentioning

confidence: 99%

Study of the phase transitions by observation of the A and¹H nuclear magnetic resonance in ANH₄SO₄(A =⁷Li,³⁹K and⁸⁷Rb) single crystals with excellent optical quality

Lim¹,

Kim²

2008

J. Phys.: Condens. Matter

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ANH 4 SO 4 (A = Li, K and Rb) single crystals were grown using the slow evaporation method. We studied the spectra, spin-lattice relaxation times, T 1 , and spin-spin relaxation times, T 2 , of the 1 H, 7 Li, 39 K and 87 Rb nuclei in these three types of single crystals. The nuclear magnetic resonance observations provided a consistent description of the dynamics of the studied nuclei in these materials. The T 1 values for the 1 H nuclei are similar in all three crystals and the 1 H spin-lattice relaxation times increase with increasing temperature. However, as the radii of the metal ions increase, a corresponding decrease in the spin-lattice relaxation times of the A nuclei is observed. The differences observed in the spin-lattice relaxation times of the A nuclei upon changing the alkali-metal ion may be related to the ionic radius and the lengths of the A-O bonds. Therefore, the occurrence of phase transitions in these materials seems to be essentially dependent on the presence of the metal ions.

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“…Doping with Fe, Co, Ni, Zn, etc in YBa 2 Cu 3 O y not only alters the superconducting transition temperature T C to a large extent, but also influences other physical properties such as the lattice components of the specific heat [8,9] and the coefficient of thermal expansion [6][7][8][10][11][12][13]. Thermal expansion is a useful tool for providing valuable information about the changes in the electronic and phononic properties across the superconducting transition [9,14].…”

Section: Introductionmentioning

confidence: 99%

“…The close relation between the specific heat and thermal expansion of solids (Grüneisen formalism) can be effectively utilized for a detailed thermodynamic treatment (Ehrenfest relations) of phase transitions, and such studies have been widely carried out by many investigators on the dopants which occupy copper plane and chain sites in the high T C superconductor YBa 2 Cu 3 O y [9,14,15]. These reports indicate that for dopants like Fe and Co, the jump in thermal expansion increases with the increase in dopant concentration [8,11,12]. On the other hand, such a jump decreases with the contents of dopants such as Ni and Zn [6,7].…”

Section: Introductionmentioning

confidence: 99%

The influence of Mn doping on the thermal expansion of the highT_Csuperconductor YBa₂(Cu_1−xMn_x)₃O_y

Rao

Radheshyam

Kumar

et al. 2007

J. Phys.: Condens. Matter

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Measurement of the linear thermal expansion α has been carried out for Mn substituted YBa 2 (Cu 1−x Mn x ) 3 O y (0 x 2%) using a high resolution dilatometer over the temperature range 10-300 K. Across the superconducting transition, the jump in the coefficient of linear thermal expansion α was found to decrease with increasing Mn content. For the pure sample, we observed a negative jump. While a threefold decrease in α with x = 0.5% was observed, only slight changes in the oxygen content and transition temperature have been noted, as a function of the Mn concentration. The above observations clearly suggest that the substituent Mn is being incorporated into the superconductors as a whole and not in the form of a local cluster. Further, from the Ehrenfest relations, the pressure dependence of T C (dT C /dP) and the discontinuity in the compressibility, K , are expected to decrease with the Mn concentration.

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Effect of Co substitution on the thermal expansion of the high-Tc superconductor Y1Ba2Cu3Oy

Cited by 7 publications

References 38 publications

Effect of Fe, Co, and Zn Substitution on Thermal Expansion of GdBa[sub 2]Cu[sub 3]O[sub 7]

Effect of Fe, Co, and Zn Substitution on Thermal Expansion of GdBa[sub 2]Cu[sub 3]O[sub 7]

Study of the phase transitions by observation of the A and¹H nuclear magnetic resonance in ANH₄SO₄(A =⁷Li,³⁹K and⁸⁷Rb) single crystals with excellent optical quality

The influence of Mn doping on the thermal expansion of the highT_Csuperconductor YBa₂(Cu_1−xMn_x)₃O_y

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Effect of Co substitution on the thermal expansion of the high-Tc superconductor Y1Ba2Cu3Oy

Cited by 7 publications

References 38 publications

Effect of Fe, Co, and Zn Substitution on Thermal Expansion of GdBa[sub 2]Cu[sub 3]O[sub 7]

Effect of Fe, Co, and Zn Substitution on Thermal Expansion of GdBa[sub 2]Cu[sub 3]O[sub 7]

Study of the phase transitions by observation of the A and1H nuclear magnetic resonance in ANH4SO4(A =7Li,39K and87Rb) single crystals with excellent optical quality

The influence of Mn doping on the thermal expansion of the highTCsuperconductor YBa2(Cu1−xMnx)3Oy

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Study of the phase transitions by observation of the A and¹H nuclear magnetic resonance in ANH₄SO₄(A =⁷Li,³⁹K and⁸⁷Rb) single crystals with excellent optical quality

The influence of Mn doping on the thermal expansion of the highT_Csuperconductor YBa₂(Cu_1−xMn_x)₃O_y