TY - JOUR
T1 - Synthesis and characterization of La2-yYyCuO4 with T'-structure
AU - Hanifah, A. I.
AU - Saito, S.
AU - Saragi, T.
AU - Kawamata, T.
AU - Koike, Y.
AU - Risdiana,
N1 - Funding Information:
The author would like to thank M. Kato, T. Noji, and H. Sato for their technical support in the synthesis and characterisation measurement at Department of Applied Physics, Tohoku University, Japan. These works were supported by Junior Year Program in English (JYPE) Tohoku University, 2016-2017, Academic Leadership Grant, Universitas Padjadjaran 2017 No. 872/UN6.3.1/LT/2017 and also partially supported by International Research Collaboration and International Publication Grant No. 718/UN6.3.1/PL/2017.
Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2018/9/17
Y1 - 2018/9/17
N2 - Superconductivity is a phenomenon when the resistivity becomes zero below the critical temperature (T c). The appearance of superconductivity in undoped bulk samples of T'-La1.8-xEu0.2 Mx CuO4 (M = Sr, Ca; x = 0.05, 0.10, 0.15) has altered the existing phase diagram in superconducting cuprates and raised big questions about the mechanism of superconductivity. Here, new materials of T'-La2-yY y CuO4 with y = 0.05, 0.10, 0.15 have been synthesized by the low-temperature synthesis method in order to grow undoped superconductors with the single phase of the T'-structure. The powder x-ray diffraction analysis was performed to identify of the crystal structure, while magnetic susceptibility measurements were carried out using a SQUID magnetometer at low temperature down to 2 K. It has been found that the T'-structure is stabilized when it was annealed at 500 - 600°C. The c-axis length decreases with increasing Yttrium-concentration. For y = 0.10, the single phase of the T'-structure was obtained by the oxidation annealing at 300°C and the succeeding reduction annealing at 500°C for 24 hours. From magnetic susceptibility measurements, it has been found that no trace superconductivity is observed in all samples, which is probably due to the remaining excess oxygen suppressing the appearance of superconductivity in the sample.
AB - Superconductivity is a phenomenon when the resistivity becomes zero below the critical temperature (T c). The appearance of superconductivity in undoped bulk samples of T'-La1.8-xEu0.2 Mx CuO4 (M = Sr, Ca; x = 0.05, 0.10, 0.15) has altered the existing phase diagram in superconducting cuprates and raised big questions about the mechanism of superconductivity. Here, new materials of T'-La2-yY y CuO4 with y = 0.05, 0.10, 0.15 have been synthesized by the low-temperature synthesis method in order to grow undoped superconductors with the single phase of the T'-structure. The powder x-ray diffraction analysis was performed to identify of the crystal structure, while magnetic susceptibility measurements were carried out using a SQUID magnetometer at low temperature down to 2 K. It has been found that the T'-structure is stabilized when it was annealed at 500 - 600°C. The c-axis length decreases with increasing Yttrium-concentration. For y = 0.10, the single phase of the T'-structure was obtained by the oxidation annealing at 300°C and the succeeding reduction annealing at 500°C for 24 hours. From magnetic susceptibility measurements, it has been found that no trace superconductivity is observed in all samples, which is probably due to the remaining excess oxygen suppressing the appearance of superconductivity in the sample.
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U2 - 10.1088/1742-6596/1080/1/012005
DO - 10.1088/1742-6596/1080/1/012005
M3 - Conference article
AN - SCOPUS:85054401553
VL - 1080
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - 1
M1 - 012005
T2 - 3rd Padjadjaran International Physics Symposium, PIPS 2017
Y2 - 14 November 2017 through 15 November 2017
ER -