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Li2ZnV3O8: a vanadium-based geometrically frustrated spinel system

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Title Li2ZnV3O8: a vanadium-based geometrically frustrated spinel system
 
Creator CHAKRABARTY, T
MAHAJAN, AV
KOTESWARARAO, B
 
Subject geometric frustration
B-site doped spinel
LiV2O4
TRANSITION-METAL OXIDE
HEAVY-FERMION
GLASS BEHAVIOR
LIV2O4
LI-7
 
Description We report the synthesis and characterization of Li2ZnV3O8, which is a new Zn-doped LiV2O4 system containing only tetravalent vanadium. A Curie-Weiss susceptibility with a Curie-Weiss temperature of theta(CW) approximate to -214 K suggests the presence of strong antiferromagnetic correlations in this system. We have observed a splitting between the zero-field cooled (ZFC) and field cooled (FC) susceptibility curves below 6 K. A peak is present in the ZFC curve around 3.5 K, suggestive of spin-freezing. Similarly, a broad hump is also seen in the inferred magnetic heat capacity around 9 K. The consequent entropy change is only about 8% of the value expected for an ordered S = 1/2 system. This reduction indicates the continued presence of large disorder in the system in spite of the large theta(CW), which might result from strong geometric frustration in the system. We did not find any temperature T dependence in our Li-7 nuclear magnetic resonance shift down to 6 K (an abrupt change in the shift does take place below 6 K), though considerable T-dependence has been found in the literature for LiV2O4-undoped or with other Zn/Ti contents. Consistent with the above observation, the 7Li nuclear spin-lattice relaxation rate 1/T-1 is relatively small and nearly T-independent, except for a small increase close to the freezing temperature which, once again, is small compared to undoped or 10% Zn or 20% Ti-doped LiV2O4.
 
Publisher IOP PUBLISHING LTD
 
Date 2014-12-28T11:31:27Z
2014-12-28T11:31:27Z
2014
 
Type Article
 
Identifier JOURNAL OF PHYSICS-CONDENSED MATTER, 26(26)
0953-8984
1361-648X
http://dx.doi.org/10.1088/0953-8984/26/26/265601
http://dspace.library.iitb.ac.in/jspui/handle/100/16365
 
Language English