ains Malaysiana 52(7)(2023): 2095-2102

http://doi.org/10.17576/jsm-2023-5207-15

Anomali Halaju Bunyi Ricih dan Atenuasi Ultrasonik dalam TmBa₂Cu₃O_7-d (d = 0.06 dan 0.6)

(Shear Sound Velocity and Ultrasonic Attenuation Anomalies in TmBa₂Cu₃O_7-d (d = 0.06 and 0.6))

R. ABD-SHUKOR^1,*, B.B. LEE¹, K. MUHAMMAD-NAJIB¹, NOR AZAH NIK-JAAFAR² & MOHD NARIZEE MOHD NASIR¹

¹Department of Applied Physics, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

²Pusat PERMATA@Pintar Negara, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

Received: 15 May 2023/Accepted: 3 July 2023

Abstrak

Halaju bunyi, dan atenuasi ultrasonik, a gelombang ricih dalam TmBa₂Cu₃O_6.94 yang mensuperkonduksi dan TmBa₂Cu₃O_6.40 yang tidak mensuperkonduksi telah diukur daripada 80 dan 200 K pada julat frekuensi MHz. Sampel superkonduktor TmBa₂Cu₃O_6.94 menunjukkan histeresis terma dan peningkatan halaju ricih,   sebanyak 2.5% apabila suhu diturunkan daripada 200 K hingga 80 K. Sampel TmBa₂Cu₃O_6.40 yang bukan superkonduktor pula menunjukkan peningkatan = 1.5% apabila suhu diturunkan dalam julat suhu yang sama.  Tiada histerisis yang ketara dicerap dalam sampel TmBa₂Cu₃O_6.40 yang bukan superkonduktor. Superkonduktor TmBa₂Cu₃O_6.94 menunjukkan halaju bunyi ricih meningkat dengan ketara berhampiran suhu genting mula (T_c-mula = 93 K) semasa penyejukan tetapi tidak semasa pemanasan. Sampel superkonduktor TmBa₂Cu₃O_6.94 juga menunjukkan puncak atenuasi berhampiran suhu genting.  Di samping itu wujud puncak atenuasi yang lebar pada 140 K semasa suhu menaik dan 160 K semasa suhu menurun bagi sampel TmBa₂Cu₃O_6.94 yang mensuperkonduksi. Anomali ultrasonik dalam superkonduktor TmBa₂Cu₃O_6.94 diterangkan menggunakan kandungan oksigen dan tertiban oksigen dalam satah dan rantai kuprum oksida.

Kata kunci: Halaju bunyi; modulus ricih; pembelauan sinar-X; tertiban oksigen

Abstract

Sound velocity, and ultrasonic attenuation, a of shear waves in superconducting TmBa₂Cu₃O_6.94 and non-superconducting TmBa₂Cu₃O_6.40 were measured from 80 to 200 K in the MHz frequency range. The superconducting TmBa₂Cu₃O_6.94 showed a thermal hysteresis and increased shear velocity, by 2.5% when the temperature was lowered from 200 K to 80 K. The non-superconducting sample TmBa₂Cu₃O_6.40 showed an increase in the shear velocity,  by 1.5% when the temperature was lowered in the same range.  No significant hysteresis was observed in the non-superconducting TmBa₂Cu₃O_6.40. The superconducting TmBa₂Cu₃O_6.94 showed a significant increase in the shear velocity near the onset critical temperature (T_c-onset = 93 K) during cooling but not warming. The superconducting sample TmBa₂Cu₃O_6.94 also showed an attenuation peak near the critical temperature. In addition, a broad attenuation peak was observed at 140 K during warming and 160 K during cooling for the superconducting TmBa₂Cu₃O_6.94 sample. The ultrasonic anomalies observed in the superconducting TmBa₂Cu₃O_6.94 was explained in terms of oxygen content and oxygen orderings in the copper oxide chains and layers.

Keywords: Oxygen orderings; shear modulus; sound velocity; X-ray diffraction

REFERENCES

Abd-Shukor, R. 2018. Ultrasonic and elastic properties of Tl-and Hg-based cuprate superconductors: A review.  Phase Transition 91: 48-57.

Abd-Shukor, R. 2002. Acoustic Debye temperature and role of phonons in cuprate and related superconductors.  Superconductor Science and Technology 15: 435-438.

Abd-Shukor, R., Tan, L.K., Nor Azah Nik-Jaafar & Mohd Nasir, M.N. 2022. Ultrasonic attenuation and shear modulus at the critical temperature of moderately doped (Tl_0.8Bi_0.2)Sr₂(Ca_0.9Cr_0.1)Cu₂O₇ superconductor. Sains Malaysiana 51(9): 3097-3101.

Bukowski, Z., Plackowski, T., Sułkowski, C., Włosewicz, D. & Zaleski, A.J. 1996. SmBa₂Cu₃O_7-d ceramics processed under oxygen pressure of 250: Enhancement of intragrain superconducting properties. Physical Review B 53: 2781.

Calemczuk, R., Banjour, E., Henry, Y.J., Forro, L., Ayache, C., Jurgens, M.J.M., Rossat-Minghod, J., Barbara, B., Burlet, P., Couach, M., Khoder, A.F. & Sake, B. 1988. Evidence of a first order phase transition in YBa₂Cu₃O_6.9 at T = 230 K.  Physica C 153-155: 960-961.

Ceder, G., Asta, M. & de Fontaine, D. 1991. Computation of the OI-OII-OIII phase diagram and local oxygen configurations for YBa₂Cu₃O_z with z between 6.5 and 7. Physica C 177: 106-114.

Cheng, X.H., Sun, L.H., Wang, Y.N., Shen, H.M. & Yu, Z. 1988. The relationship between the phase-transition-like anomalies above T_c and superconductivity in YBa₂Cu₃O_x.  Journal of Physics C 21: 4603-4609.

Knizhnik, A., Shter, G.E., Grader, G.S., Reisner, G.M. & Eckstein, Y. 2003.  Interrelation of preparation conditions, morphology, chemical reactivity and homogeneity of ceramic YBCO. Physica C 400(1-2): 25-35.

Levy, M., Xu, M., Sarma, B.K. & Sun, K.J. 1992. Ultrasonic progagation in sintered high-T_c superconductor. In Ultrasonics of High T_c and Other Unconventional Superconductors, edited by Levy, M. New York: Academic Press. XX: 295.

Mamsurova, L.G., Pigalskiy, K.S., Sakun, V.P., Shushin, A.I. & Scherbakova, L.G. 1990. First- and second-order phase transitions and oxygen rearrangement over the Cu1-O4 chains in orthorhombic YBa₂Cu₃O_6+x at low temperatures. Physica C 167: 11-19.

Marlianto, E., Yahya, M., Salleh, M.M. & Abd-Shukor, R. 1998. Oxygen related ultrasonic attenuation and elastic anomalies in EuBa₂Cu₃O_7-d (d ~ 0.02 and 0.45). Journal of Alloys and Compounds 274: 55-58.

Mineo, K., Shigemitsu, N., Kiyotaka, N., Hiroyuki, S., Shinnosuke, M., Nobuo, F. & Akira, Y. 1989. The phase change due to oxygen content in the LnBa₂Cu₃O_y compound systems (Ln = Tm, Gd and SM). Japanese Journal of Applied Physics 28: L609-L611.

Neeleshwar, S., Muralidhar, M., Murakami, M. & Venugopal Reddy, P. 2006. Elastic behavior of oxygen-controlled melt growth processed neg-123 HTSC materials.  International Journal of  Modern Physics B 20: 667-675.

Sahoo, B., Singh, A.K. & Behera, D.  2020. Graphene oxide modified superconducting and elastic parameters of YBCO superconductor. Materials Chemistry and Physics 240: 122252.

Uimin, G.V., Gantmakher, V.F., Neminsky, A.M., Novomlinsky, L.A., Shovkun, D.V. & Brüll, P. 1992. Dependence of T_c on the oxygen distribution in the CuO chains in the high temperature superconductors YBa₂Cu₃O_6+x. Physica C 192: 481-490.

Vui, C.T. & Abd-Shukor, R. 2016. Ultrasonic attenuation anomalies of n-type superconductor Pr_2-xCe_xCuO₄. Modern Physics Letters B 23: 1650314.

Zhang, L., Ying, X.N. & Yuan, Y.H. 2011. Internal friction study on bilayer cuprates Pr(Ba_1−xSr_x)₂Cu₃O_7−δ. Physica C 471: 62-65.

*Corresponding author; email: ras@ukm.edu.my