Magnetic phase diagram of Nd0.5Ca0.5−ySryMnO3

Abstract

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A-site disorder driven sharp field-induced transition and collapse of charge ordering in Sm1/2Ca1/2-xSrxMnO3

“…The rest data points indicated by the unfilled symbols are added from reported values of the end members viz., La 1=2 (Ca,Sr) 1=2 MnO 3 (triangles), 10,11 Pr 1=2 (Ca,Sr) 1=2 MnO 3 (squares), [12][13][14]37 and Nd 1=2 (Ca,Sr) 1=2 MnO 3 (diamonds). [15][16][17][18] It is evident from the figure that T CO is sensitive to hr A i. As a result of decrease in hr A i a considerable strain is developed which typically manifests through the decrease in Mn-O-Mn bond angles, a ¼ 1808 À x.…”

“…6(b), the CO state transforms to FM state at 4 K when magnetic field applied is above $75 kOe 10,11 Pr 1=2 (Ca,Sr) 1=2 MnO 3 (squares), [12][13][14]37 and Nd 1=2 (Ca,Sr) 1=2 MnO 3 (diamonds). [15][16][17][18] The data obtained from the current investigation are given by the filled symbols.…”

“…The variation in A-site ionic radii reveals systematic change in Curie temperature (T C ), N eel temperature (T N ), and CO temperature (T CO ) in systems like La 1=2 (Ca,Sr) 1=2 MnO 3 , 10,11 Pr 1=2 (Ca,Sr) 1=2 MnO 3 , [12][13][14] and Nd 1=2 (Ca,Sr) 1=2 MnO 3 . [15][16][17][18] In case of Sm 1=2 Ca 1=2Àx Sr x MnO 3 , the end composition at x ¼ 1/2 is already recognized as an interesting system where FM, CO/OO, and A-type AFM states compete with each other. [19][20][21][22][23][24][25] The other end member at x ¼ 0 is rather less studied where a robust CO has been reported with high T CO ($275 K).…”