Possible quantum critical point in La(2/3)Ca(1/3)Mn(1-x)Ga x O3 |
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| Authors: | De Teresa J M Algarabel P A Ritter C Blasco J Ibarra M R Morellon L Espeso J I Gómez-Sal J C |
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| Affiliation: | Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, Zaragoza, Spain. deteresa@unizar.es |
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| Abstract: | We study the magnetic ground state in La(2/3)Ca(1/3)Mn(1-x)Ga x O3 manganites, where a quantum critical point (QCP) has been theoretically predicted. The metallic ferromagnetic ground state for low Ga doping breaks down for x > or = 0.11, an insulating state being established at low temperatures. Long-range ferromagnetism coexists with short-range magnetic correlations in the concentration range 0.11 < or = x < or = 0.145 while only the short-range correlations survive for x > or = 0.16. We discuss the implications of such a QCP to the physics of manganites and compare to other QCP systems. |
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