Magnetoresistance anomaly at the transition to coherent state in SmB6

✍ Scribed by V.V. Glushkov; S.V. Demishev; M.I. Ignatov; A.V. Kuznetsov; Yu.B. Paderno; N.Yu. Shitsevalova; D.N. Sluchanko; N.E. Sluchanko

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 133 KB
• Volume: 378-380
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2006.01.166

✦ Synopsis

To shed more light on the nature of puzzling ''metallic'' state observed in intermediate-valence compound SmB 6 below T Ã $5 K, precise measurements of transport and magnetic properties have been carried out on single crystals of SmB 6 in a wide range of temperatures (1.8-30 K) in magnetic fields up to 7 T. A strong enhancement of negative magnetoresistance to the maximum value of Dr/ rB 2 $À2.2 Â 10 À3 T À2 at T$T * has been detected when temperature decreases below 14 K. This effect is attributed to the features of anomalous scattering of short-range (o10 A ˚) exciton-polaronic complexes resulting from fast charge fluctuations on Sm-sites. The anomalies of transport and magnetic characteristics are discussed in terms of electron phase transition to the coherent state of interacting many-body complexes below T Ã $5 K.