Specific Heat of RBa_{2}Cu_{3}O_{7-x} and RBaSrCu_{3}O_{7-x} Compounds (R = Sm, Dy, Er)

• Authors: Z. Tarnawski , N. Kim-Ngan , X. Wang , V. Duijn , J. Franse
• Languages of publication: EN

Abstracts

EN

The low-temperature specific-heat C(T) data of high-T_{c} superconductors RBa_{2}Cu_{3}O_{7-x}(R123O_{7-x}) were reviewed. A discussion of the C(T) data obtained on single-crystalline samples of Er123O_{7-x} and Sm123O_{7-x} compounds in applied magnetic fields for better evaluation of the crystal-electric-field parameters is given. The C(T) measurements of Sr-substituted compounds RBaSrCu_{3}O_{7} revealed the λ-type of peak related to the antiferromagnetic order at 1.2 K and 0.6 K respectively for Dy- and Er-compounds. The magnetic singlet ground state in these compounds is produced by weak exchange interactions of -0.05 T/μ_{B} and -0.035 T/μ_{B}, respectively. For Nd- and Sm-compounds, only a broad anomaly around 0.6 K was observed which is well fitted with a Schottky-type anomaly with an energy splitting of 1.4 K.

Keywords

EN

74.70.-b; 75.40.-s

Discipline

• 74.70.-b: Superconducting materials other than cuprates(for cuprates, see 74.72.-h; for superconducting films, see 74.78.-w)
• 75.40.-s: Critical-point effects, specific heats, short-range order(for equilibrium properties near critical points, see 64.60.F-; for dynamical critical phenomena, see 64.60.Ht)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1998
• Volume: 93
• Issue: 3
• Pages: 513-522

Dates

published

1998-03

received

1997-04-03

(unknown)

1997-11-05

Contributors

author

Z. Tarnawski

• Solid State Physics Dept., Faculty of Physics and Nuclear Technique, University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Kraków, Poland,

author

N. Kim-Ngan

• Institute of Physics and Informatics, Pedagogical University, Podchorążych 2, 30-084 Kraków, Poland,

author

X. Wang

• Angewandte Physik, J. Kepler Universität, A-4040 Linz, Austria,

author

V. Duijn

• Van der Waals-Zeeman Laboratorium, Universiteit van Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands

author

J. Franse

• Van der Waals-Zeeman Laboratorium, Universiteit van Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands

Identifiers

DOI

10.12693/APhysPolA.93.513