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PbCu3TeO7: an S=1/2 staircase kagome lattice with significant intra-plane and inter-plane couplings

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Title PbCu3TeO7: an S=1/2 staircase kagome lattice with significant intra-plane and inter-plane couplings
 
Creator KOTESWARARAO, B
KUMAR, R
CHAKRABORTY, J
JEON, BG
MAHAJAN, AV
DASGUPTA, I
KIM, KH
CHOU, FC
 
Subject MUFFIN-TIN ORBITALS
ANTIFERROMAGNET
NI3V2O8
ORDER
HEAT
 
Description We have synthesized polycrystalline and single-crystal samples of PbCu3TeO7 and studied its properties via magnetic susceptibility, chi(T), and heat-capacity, C-p(T), measurements and also electronic structure calculations. Whereas the crystal structure is suggestive of the presence of a quasi-2D network of Cu2+(S = 1/2) buckled staircase kagome layers, the chi(T) data show magnetic anisotropy and three magnetic anomalies at temperatures T-N1 similar to 36 K, T-N2 similar to 25 K, and T-N3 similar to 17 K. The chi(T) data follow the Curie-Weiss law above 200 K and a Curie-Weiss temperature theta(CW) similar to -150 K is obtained. The data deviate from the simple Curie-Weiss law below 200 K, which is well above T-N1, suggesting the presence of competing magnetic interactions. The magnetic anomaly at T-N3 appears to be of first order from magnetization measurements, although our C-p(T) results do not display any anomaly at T-N3. The hopping integrals obtained from our electronic structure calculations suggest the presence of significant intra-kagome (next-nearest neighbor and diagonal) and inter-kagome couplings. These couplings take the PbCu3TeO7 system away from a disordered ground state and lead to long-range order, in contrast to what might be expected for an ideal (isotropic) 2D kagome system.
 
Publisher IOP PUBLISHING LTD
 
Date 2014-10-16T06:22:37Z
2014-10-16T06:22:37Z
2013
 
Type Article
 
Identifier JOURNAL OF PHYSICS-CONDENSED MATTER, 25(33)
http://dx.doi.org/10.1088/0953-8984/25/33/336003
http://dspace.library.iitb.ac.in/jspui/handle/100/15422
 
Language en