Anomalous superconducting properties in the weak-ferromagnetic superconductors RuSr2GdCu2O8 and RuCa 2PrCu2O8

B. C. Chang, C. Y. Yang, Yung-Yuan Hsu, B. N. Lin, H. C. Ku

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Anomalous superconducting properties are reported through transport, magnetic, and x-ray absorption near-edge spectroscopy (XANES) studies on the weak-ferromagnetic superconductors RuSr2GdCu2O8 and RuCa2PrCu2O8. For RuSr 2GdCu2O8 [Tm = 131 K, resistivity Tc(onset) = 56 K, Tc(zero) = Tc(dia) = 39 K], a spontaneous vortex state above T0 = 30 K and a weak Meissner state below T0 with a lower critical field Bc1(0) = 12 G is observed due to the weak dipole field (∼ 4 G) of the weak-ferromagnetic order. In RuCa2PrCu2O8 (Tm = 47 K, possible Tc = 37 K), an anomalously large field-cooled diamagnetic shielding signal is observed below Tc. Both samples show mixed-valence Ru4/5+ character from XANES data.

Original languageEnglish
Title of host publicationLOW TEMPERATURE PHYSICS
Subtitle of host publication24th International Conference on Low Temperature Physics - LT24
Pages677-678
Number of pages2
Volume850
DOIs
Publication statusPublished - 2006 Dec 1
EventLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 - Orlando, FL, United States
Duration: 2006 Aug 102006 Oct 17

Other

OtherLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24
Country/TerritoryUnited States
CityOrlando, FL
Period2006/08/102006/10/17

Keywords

  • High-Tc cuprates
  • Magnetic superconductor
  • Spontaneous vortex state

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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