Electrical-transport, magnetoresistance and magnetic properties of La{sub 0.7}Ca{sub 0.3}MnO{sub 3} and La{sub 0.7}Ca{sub 0.24}Sr{sub 0.06}MnO{sub 3} single crystals

Journal Article · Wed Jun 24 00:00:00 EDT 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4918055· OSTI ID:22490491

Sanyal, S. P. ^[1]; Bodhaye, Ashish ^[2]; Mukovskii, Ya. M. ^[3]

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1. Solid State Physics Laboratory, Department of Physics, Barkatullah University, Bhopal-462026 (India)
2. Department of Physics, St. Vincent Pallotti College of Eng. & Tech., Nagpur – 400002 (India)
3. Moscow State Steel and Alloys Institute, Moscow – 117936 (Russian Federation)

We report the electrical-transport, magnetoresistance and magnetic properties of the hole doped La{sub 0.7}Ca{sub 0.3}MnO{sub 3} (LCMO) and La{sub 0.7}Ca{sub 0.24}Sr{sub 0.06}MnO{sub 3} (LCSMO) single crystals. It was prepared using floating zone technique. The resistivity data shows the metal to insulator transition (T{sub MI}) occurs at 211 K along c-axis and T{sub MI} = 185 K the ab-plane for LCMO and T{sub MI} = 290 K along the c-axis and T{sub MI} = 280 K along the ab-plane for LCSMO single crystals. It is observed that the T{sub MI} is higher along the c-axis as compared to that in the ab-plane, consequently signifying more favorable hoping of electrons is along the c-axis. The ac-susceptibility measurement shows that this material exhibits ferromagnetic to paramagnetic transition temperature (TC) at 206 K for LCMO and T{sub C} = 277 K for LCSMO single crystals. For magnetic memory device application point of view, the sample shows the maximum MR of 98% for LCMO and 80% for LCSMO single crystals at 8T applied magnetic field. Doping small amount of Sr (0.06%) reveals that the electronic and magnetic phase transition in CMR single crystal increases substantially and useful for device application. This is first time such type of comparative study in these manganite single crystals.

• OSTI ID: 22490491
• Journal Information: AIP Conference Proceedings, Vol. 1665, Issue 1; Conference: 59. DAE solid state physics symposium 2014, Tamilnadu (India), 16-20 Dec 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CALCIUM COMPOUNDS
COMPARATIVE EVALUATIONS
DOPED MATERIALS
FERROMAGNETISM
HOLES
LANTHANUM COMPOUNDS
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETORESISTANCE
MANGANATES
MEMORY DEVICES
PARAMAGNETISM
STRONTIUM COMPOUNDS
TRANSITION TEMPERATURE
ZONE MELTING