Sains 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

Diserahkan: 15 Mei 2023/Diterima: 3 Julai 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

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*Pengarang untuk surat-menyurat; email: ras@ukm.edu.my