Mesoscopic fluctuations in colossal magnetoresistance

Citation
Rd. Merithew et al., Mesoscopic fluctuations in colossal magnetoresistance, J PHYS JPN, 69, 2000, pp. 257-261
Citations number
11
Categorie Soggetti
Physics
Journal title
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
ISSN journal
00319015 → ACNP
Volume
69
Year of publication
2000
Supplement
A
Pages
257 - 261
Database
ISI
SICI code
0031-9015(200005)69:<257:MFICM>2.0.ZU;2-R
Abstract
In the colossal magnetoresistive regime epitaxial single-crystal manganite samples exhibit discrete resistance fluctuations. Their overall dependence on magnetic field indicates fluctuations between states with different abso lute magnetization, not just different orientations. The dependences of Bol tzmann factors on field and temperature give the differences in magnetic mo ment and entropy between the states, and hence give the volumes of the fluc tuating domains. The large discrete resistance fluctuations imply strong in homogeneity of the current. Evidence for thermodynamic effects favoring a m ixed phase is given.