Tricritical point in hole-doped manganite La0.5Ca0.4Li0.1MnO3

Renwen Li; Changjin Zhang; Li Pi; Yuheng Zhang

doi:10.1209/0295-5075/107/47006

All issues

Volume 107 / No 4 (August 2014)

EPL, 107 4 (2014) 47006

Abstract

Issue		EPL Volume 107, Number 4, August 2014


Article Number		47006
Number of page(s)		6
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/107/47006
Published online		14 August 2014

EPL, 107 (2014) 47006

Tricritical point in hole-doped manganite La_0.5Ca_0.4Li_0.1MnO₃

Renwen Li¹^,2^(a), Changjin Zhang², Li Pi² and Yuheng Zhang²

¹ Department of Physics and Electronic Engineering, Hefei Normal University - Hefei 230061, China
² High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China Hefei 230031, China

^(a) lirw@hftc.edu.cn

Received: 5 June 2014
Accepted: 27 July 2014

Abstract

The critical behavior of hole-doped perovskite manganite La_0.5Ca_0.4Li_0.1MnO₃ has been investigated based on the static magnetization measurement around the second-order paramagnetic-ferromagnetic (PM-FM) transition at 250.5 K. The critical exponents $\beta =0.255\pm 0.001$ and $\gamma =0.987\pm 0.006$ have been obtained based on both the modified Arrott plot and the Kouvel-Fisher method. The critical isotherm analysis gives $\delta =4.90\pm 0.07$ . The critical exponents fulfill the Widom scaling relation $\delta =1+\gamma /\beta$ and obey the single scaling equation $M(H,\,\varepsilon)=\varepsilon^{\beta} f_{\pm}(H/\varepsilon^{\beta+\gamma})$ , implying the reliability of the obtained exponents. Its relative cooling power (RCP) is found to be scaled with the magnetic field $(H)$ by the law of $\text{RCP}\ {}\sim H^{1+1/\delta}$ . The critical-exponent values deduced here approach the theoretical prediction of the tricritical mean-field model, which suggests that the present composition should be close to a tricritical point in the phase diagram of hole-doped manganite La_0.5Ca_0.5−xLi_xMnO₃.

PACS: 75.40.-s – Critical-point effects, specific heats, short-range order / 75.30.-m – Intrinsic properties of magnetically ordered materials / 75.47.Lx – Magnetic oxides

© EPLA, 2014

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