Magnetic and Thermal Behavior of Ru0.9Sr2YCu2.1O7.9 Magneto-Superconductor Synthesized by High-Pressure High-Temperature Technique

Kumar, Anuj and Gahtori, Bhaskar and Rao, Ashok and Kuo, Y K and Shahnawaz, . and Awana, V P S and Tandon, R P (2011) Magnetic and Thermal Behavior of Ru0.9Sr2YCu2.1O7.9 Magneto-Superconductor Synthesized by High-Pressure High-Temperature Technique. Journal of Superconductivity and Novel Magnetism, 24. pp. 1643-1648.

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Abstract

The structural, physical, and thermal property details of Ru0.9Sr2YCu2.1O7.9 (Y/Ru-1212) superconducting material synthesized through high pressure (6 GPa) and a high temperature (1400 °C) (HPHT) route are reported here. (Y/Ru-1212) crystallizes in P4/mmm tetragonal structure and is found free of any detectable impurities through Xray diffractometry. Ru-spins are ordered magnetically above 145 K, with a sizeable ferromagnetic component at 5 K. Further clear diamagnetic transitions are seen in both zero-fieldcooled (ZFC) and field-cooled (FC) magnetic susceptibility measurements and exhibiting super conductivity below 50 K. Both the thermoelectric power (S) and thermal conductivity (κ) measurements show superconductivity onset below 50 K with S = 0 at 30 K and a broad hump in heat capacity Cp(T ) below 30 K. Heat capacity (Cp) measurements also exhibit the magnetic ordering temperature as a hump below 145 K. The appearance of a hump in Cp(T ), instead of a clear transition, is indicative of short range magnetic correlations like spin glass (SG). Neither the high (145 K) nor the low (30 K) temperature humps of Cp(T ) could be analyzed quantitatively because of short magnetic correlations in former and mixing of both superconductivity and FM components in a later case. The observed data is compared with various reported Ru-1212 systems synthesized under normal pressure conditions. It is concluded that HPHT synthesized Y/Ru- 1212 is a bulk superconductor below 30 K with a substantial FM component.

Item Type: Article
Uncontrolled Keywords: Superconductors · Magnetic materials · X-ray diffraction · Thermal conductivity · Specific heat
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 03 Apr 2014 11:32
Last Modified: 04 Apr 2014 04:45
URI: http://eprints.manipal.edu/id/eprint/139297

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