Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 30, Issue 29, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/aacb19
Keywords
Gd5Sb3; magnetic phase transitions; antiferromagnetism
Categories
Funding
- University Grants Commission (UGC)-India
- Indian Institute of Technology Bombay
- Russian Foundation for Basic Research [16-52-48012]
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We report on the combined results of the structural, magnetic, transport and calorimetric properties of Mn5Si3-type hexagonal Gd5Sb3, together with ab initio calculations. It exhibits a ferromagnetic (FM)-like transition at 265 K, antiferromagnetic (AFM) Noel transition at 95.5 K followed by a spin-orientation transition at 62 K. The system is found to be in AFM state down to 2 K in a field of 70 kOe. The FM-AFM phase coexistence is not noticeable despite large positive Curie-Weiss temperature (theta(CW) = 223.5 +/- 0.2 K). Instead, low-temperature AFM and high-temperature FM-like phases are separated in large temperatures. Temperature-magnetic field (H-T) phase diagram reveals field-driven complex magnetic phases. Within the AFM phase, the system is observed to undergo field-driven spin-orientation transitions. Field-induced tricritical and quantum critical points appear to be absent due to the strong AFM nature and by the intervention of FM-like state between paramagnetic and AFM states, respectively. The metallic behavior of the compound is inferred from resistivity along with large Sommerfeld parameter. However, no sign of strong electron-correlations is reasoned from the Kadowaki-Wood's ratio A/gamma(2) similar to 1.9 x 10(-6) mu Omega . cm . (mol . K)(2) (mJ)(-2), despite heavy gamma. Essentially, ab initio calculations accounting for electronic correlations confirm AFM nature of low-temperature magnetic state in Gd5Sb3 and attainable FM ordering in agreement with experimental data.
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