Phys. Rev. B 64, 012407 (2001) [4 pages]First-order field-induced transition, magnetoresistance, and giant magnetostriction in single crystals of (La0.4Pr0.6)1.2Sr1.8Mn2O7Received 19 January 2001; published 11 June 2001 The well-established paraferromagnetic transition (Tc) accompanied by a semiconductor-metal transition in the bilayer manganite La1.2Sr1.8Mn2O7 was found to be suppressed in single crystals of (La0.4Pr0.6)1.2Sr1.8Mn2O7. However, a first-order field-induced transition was observed accompanied by a huge decrease of the c-axis resistance by a factor of one million. The magnetoresistance data correlate well with an equally large negative magnetostriction. In addition, strong anisotropic properties are observed. The data reflect the presence of unusual interplay among spin, charge, and orbital degrees of freedom in this layered structure. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.64.012407
DOI:
10.1103/PhysRevB.64.012407
PACS:
75.30.Vn, 75.80.+g, 72.15.Gd, 71.30.+h
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