Effect of Mn substitution on the thermal expansion of EuBa2Cu3O7-δ

Research output: Contribution to journalConference article

Abstract

In the present communication, effect of Mn substitution on thermal expansion of EuBa2Cu3-xMnxO7-δ has been investigated. Thermal expansion measurements have been carried out using a high resolution dilatometer based on three terminal capacitance method. The present set-up is sensitive enough to detect small changes in linear thermal expansion coefficient, a of less than 10"8 per Kelvin. Results show that the pristine sample exhibits a jump in thermal expansion coefficient around its transition temperature which is a characteristic of a second order phase transition. For the pure sample a jump in a, of the order of 9.5 × 10-8 K-1 has been observed. It is seen that Mn doping reduces the jump in thermal expansion. Using the well-known Ehrenfest relations, both the pressure dependence of Tc, dTc/dP and the discontinuity in compressibility, δK, are determined and are seen to decrease with increase in Mn concentration.

Original languageEnglish
Pages (from-to)606-610
Number of pages5
JournalPhysics Procedia
Volume36
DOIs
Publication statusPublished - 01-01-2012

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thermal expansion
substitutes
extensometers
coefficients
pressure dependence
compressibility
discontinuity
capacitance
communication
transition temperature
high resolution

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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title = "Effect of Mn substitution on the thermal expansion of EuBa2Cu3O7-δ",
abstract = "In the present communication, effect of Mn substitution on thermal expansion of EuBa2Cu3-xMnxO7-δ has been investigated. Thermal expansion measurements have been carried out using a high resolution dilatometer based on three terminal capacitance method. The present set-up is sensitive enough to detect small changes in linear thermal expansion coefficient, a of less than 10{"}8 per Kelvin. Results show that the pristine sample exhibits a jump in thermal expansion coefficient around its transition temperature which is a characteristic of a second order phase transition. For the pure sample a jump in a, of the order of 9.5 × 10-8 K-1 has been observed. It is seen that Mn doping reduces the jump in thermal expansion. Using the well-known Ehrenfest relations, both the pressure dependence of Tc, dTc/dP and the discontinuity in compressibility, δK, are determined and are seen to decrease with increase in Mn concentration.",
author = "Ashok Rao",
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Effect of Mn substitution on the thermal expansion of EuBa2Cu3O7-δ. / Rao, Ashok.

In: Physics Procedia, Vol. 36, 01.01.2012, p. 606-610.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Effect of Mn substitution on the thermal expansion of EuBa2Cu3O7-δ

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N2 - In the present communication, effect of Mn substitution on thermal expansion of EuBa2Cu3-xMnxO7-δ has been investigated. Thermal expansion measurements have been carried out using a high resolution dilatometer based on three terminal capacitance method. The present set-up is sensitive enough to detect small changes in linear thermal expansion coefficient, a of less than 10"8 per Kelvin. Results show that the pristine sample exhibits a jump in thermal expansion coefficient around its transition temperature which is a characteristic of a second order phase transition. For the pure sample a jump in a, of the order of 9.5 × 10-8 K-1 has been observed. It is seen that Mn doping reduces the jump in thermal expansion. Using the well-known Ehrenfest relations, both the pressure dependence of Tc, dTc/dP and the discontinuity in compressibility, δK, are determined and are seen to decrease with increase in Mn concentration.

AB - In the present communication, effect of Mn substitution on thermal expansion of EuBa2Cu3-xMnxO7-δ has been investigated. Thermal expansion measurements have been carried out using a high resolution dilatometer based on three terminal capacitance method. The present set-up is sensitive enough to detect small changes in linear thermal expansion coefficient, a of less than 10"8 per Kelvin. Results show that the pristine sample exhibits a jump in thermal expansion coefficient around its transition temperature which is a characteristic of a second order phase transition. For the pure sample a jump in a, of the order of 9.5 × 10-8 K-1 has been observed. It is seen that Mn doping reduces the jump in thermal expansion. Using the well-known Ehrenfest relations, both the pressure dependence of Tc, dTc/dP and the discontinuity in compressibility, δK, are determined and are seen to decrease with increase in Mn concentration.

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