Magnetic, specific heat and powder neutron diffraction studies of HoIn

✍ Scribed by D.T.K. Anh; G. Nakamoto; T. Tsuji; M. Kurisu; Y. Andoh; T. Tsutaoka; N. Achiwa; S. Kawano

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 759 KB
• Volume: 381
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2005.12.263

✦ Synopsis

The successive magnetic transitions and magnetic structure of hexagonal Ho 2 In compound have been investigated by the magnetic, specific heat and powder X-ray and neutron diffraction measurements. Two magnetic phase transitions have been observed at the paramagnetic to ferromagnetic transition temperature T c ¼ 85:0ð2Þ K and the magnetic order-order transition temperature T t ¼ 32:5ð2Þ K. No antiferromagnetic reflections have been observed in the neutron diffraction patterns. The Rietveld analysis has indicated that the Ho atoms possess different moment values at two inequivalent sites: 8.8(2) m B and 9.0(2) m B at 2 K and 7.0(2) m B and 7.4(2) m B at 45 K, respectively. The moment direction from the hexagonal c-axis is 41ð10Þ at 2 K. At 45 K, the reliability factor takes so shallow minimum at around 26ð20Þ that one cannot exclude the alignment of moments along the c-axis in the higher temperature phase. A model is suggested for the magnetic structure change at T t .