1996
DOI: 10.1103/physrevb.53.r1689
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Magnetic-field-induced metal-insulator phenomena inPr1xCaxMn

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Cited by 896 publications
(570 citation statements)
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“…5) decreases linearly with magnetic fields and extrapolates to zero at H ≈ 5 T, which is close to the field required for inducing the first order transition to a metallic state at low temperatures. 29 The activation energy deduced from the dielectric relaxation under ZFC process (ε ZFC in Fig. 5) is approximately independent of field below H @ 0.5 T, and then decreases with increasing field, attaining a slope similar to that of the FC data for H > 1 T.…”
Section: Introductionmentioning
confidence: 77%
“…5) decreases linearly with magnetic fields and extrapolates to zero at H ≈ 5 T, which is close to the field required for inducing the first order transition to a metallic state at low temperatures. 29 The activation energy deduced from the dielectric relaxation under ZFC process (ε ZFC in Fig. 5) is approximately independent of field below H @ 0.5 T, and then decreases with increasing field, attaining a slope similar to that of the FC data for H > 1 T.…”
Section: Introductionmentioning
confidence: 77%
“…The charge-ordering of the Mn-ions occurs over a wide range from 0.3 < x < 0.75 with an ordering temperature near 250 K. 25,26 Pr 0.65 Ca 0.35 MnO 3 shows insulating behavior in both the paramagnetic and ferromagnetic states because of the charge-ordered state of Mn 3+ and Mn 4+ . 27 Magnetic and transport properties of manganites have been studied with great interest and enthusiasm by scientists and will be continued to be studied in the future because of the vast range of properties these systems possess which make them desirable from an application point of view. However, studies have not been done concerning their optical properties because these systems show either insulator (large band gap; typically >4 eV) behavior or metallic (no band gap) behavior, which makes them less interesting for optical studies.…”
Section: Introductionmentioning
confidence: 99%
“…Solid symbols show the dispersion of selected LO-phonon modes collected along the reciprocal-lattice directions as specified in the legend. [21,33] of these two compounds in figure 9), thus the magnon behaviour in the field-induced FM metallic state can also be studied. Though application of magnetic field adds a field-induced Zeeman gap [34], it is remarkable that all three samples exhibit very similar low-q behaviour disregarding the difference in achieving the FM metallic states either by temperature or by magnetic field.…”
Section: Doping Dependence Of Magnon Excitationsmentioning
confidence: 99%