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A-site disorder driven sharp field-induced transition and collapse of charge ordering in Sm1/2Ca1/2-x Sr x MnO3
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10.1063/1.4755802
/content/aip/journal/jap/112/7/10.1063/1.4755802
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/7/10.1063/1.4755802

Figures

Image of FIG. 1.
FIG. 1.

X-ray diffraction patterns of (black symbols) at x = 0 (a), 1/6 (b), 1/3 (c), and 1/2 (d) at 300 K with the fit from Rietveld refinement (red curve). Blue plot is the residual. Green bars show the peak positions.

Image of FIG. 2.
FIG. 2.

Plot of with along with the reported results.29 Data representing open circles are obtained from the current investigation.

Image of FIG. 3.
FIG. 3.

Temperature variations of ZFC-FC magnetization measured at 100 Oe for x = 0 (a), 1/6 (b), 1/3 (c), and 1/2 (d) in are plotted in semi-log scale. Solid and open symbols represent the ZFC and FC data, respectively. Signature of is indicated by the arrows.

Image of FIG. 4.
FIG. 4.

Temperature variation of at f = 3, 11, and 112 Hz for x = 1/3. Upper and lower insets show the enlarged low-temperature and high-temperature peaks, respectively, at different f.

Image of FIG. 5.
FIG. 5.

Variations of (unfilled symbols) with obtained from the results of the end members in (Ca,Sr) (triangles),10,11 (Ca,Sr) (squares),12–14,37 and (Ca,Sr) (diamonds).15–18 The data obtained from the current investigation are given by the filled symbols.

Image of FIG. 6.
FIG. 6.

Magnetization curves at 45 K for x = 1/6, 1/3, and 1/2 measured at a field sweep rate, 2 kOe/min (a) and at 4 K for x = 0, 1/6, 1/3, and 1/2 measured at a field sweep rate, 5 kOe/min (b) of .

Image of FIG. 7.
FIG. 7.

The H–T phase diagram of at x = 1/6 and 1/3. The values of critical field () during increasing (solid) and decreasing (open) field cycles taken from the measurements at sweep rate of 2 kOe/min. Squares and triangles represent the data for x = 1/3 and 1/6, respectively.

Image of FIG. 8.
FIG. 8.

Temperature variation of resistivity in zero-field at different x in .

Image of FIG. 9.
FIG. 9.

MR-H curves at 40 K measured in sweep mode at a rate of 5 kOe/min at 40 K (a) and 50 K (b) for x = 1/6 and 1/3, respectively.

Image of FIG. 10.
FIG. 10.

MR-H curves at 5 K measured in sweep mode at a rate of 5 kOe/min at x = 1/6 (a) and 1/3 (b) for .

Tables

Generic image for table
Table I.

Crystallographic parameters with Pnma space group and orthorhombic structure obtained from the Rietveld refinement of x-ray diffraction patterns of at 300 K. The atomic positions of Mn are at (0, 0, 0.5), Sm/Ca/Sr at (X, 0.25, Z), and O1 and O2 at (X, 0.25, Z) and (X, Y, Z), respectively.

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/content/aip/journal/jap/112/7/10.1063/1.4755802
2012-10-01
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A-site disorder driven sharp field-induced transition and collapse of charge ordering in Sm1/2Ca1/2-xSrxMnO3
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/7/10.1063/1.4755802
10.1063/1.4755802
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