Magnetic phase transition and electronic transport in single-crystalline La0.7Ca0.3MnO3 / Bebenin N. G.,Zainullina R. I.,Bannikova N. S.,Ustinov V. V.,Mukovskii Ya. M. // PHYSICAL REVIEW B. - 2008. - V. 78, l. 6.

ISSN/EISSN:

2469-9950 / 2469-9969

Type:

Article

Abstract:

The results of measurements of temperature and magnetic-field dependences of magnetization, resistivity, thermopower, and Hall effect in La0.7Ca0.3MnO3 single crystal are reported. It is shown that below 220 K, the holes of low mobility dominate conductivity, so that the crystal behaves as a ``bad{''} metal, which is at the threshold of localization at T = 220 K. Above 250 K, La0.7Ca0.3MnO3 is in the paramagnetic semiconductor state with the nearest-neighbor hopping conductivity. The ferromagnetic-to-paramagnetic phase transition is first order; the transition heat is about 0.04 kJ/mol. Application of a magnetic field results in the shift of T-C toward higher temperatures with the rate dT(C)/dH approximate to 0.8 K/kOe. The shift in T-C is the driving force for the colossal magnetoresistance (CMR) effect observed in La0.7Ca0.3MnO3.

Author keywords:

MANGANITES; ORDER; LA1-XSRXMNO3

DOI:

10.1103/PhysRevB.78.064415

Web of Science ID:

ISI:000259264900064

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	AUG
Publisher	AMER PHYSICAL SOC
Address	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Language	English
Article-Number	064415
EISSN	2469-9969
Keywords-Plus	MANGANITES; ORDER; LA1-XSRXMNO3
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
Author-Email	bebenin@imp.uran.ru
ResearcherID-Numbers	Bannikova, Nataly/J-5273-2013 Zainullina, Rimma/J-4287-2013 Svetlana, Ahmetzhanova/H-3797-2012 Ustinov, Vladimir/G-7501-2011 Bebenin, Nikolay/K-6955-2013
ORCID-Numbers	Bannikova, Nataly/0000-0002-8716-5128 Zainullina, Rimma/0000-0002-0353-4775 Ustinov, Vladimir/0000-0002-5155-7947 Bebenin, Nikolay/0000-0003-2035-6103
Funding-Acknowledgement	RFBR {[}06-02-16085, NSh-3257.2008.2]
Funding-Text	This work was supported by RFBR Grants No. 06-02-16085 and No. NSh-3257.2008.2.
Number-of-Cited-References	25
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	12
Journal-ISO	Phys. Rev. B
Doc-Delivery-Number	349EU