Unravelling the nature of ferromagnetic- paramagnetic phase transition and its bearing on colossal magnetoresistance in nanocrystalline La1-xCaxMnO3 (0.3 ≤ x ≤ 0.4)

被引：7

作者：

Bitla, Yugandhar ^{[1
]}

Kaul, S. N. ^{[1
]}

机构：

[1] Univ Hyderabad, Sch Phys, Hyderabad 500046, Andhra Pradesh, India

来源：

EPL | 2013年 / 103卷 / 05期

关键词：

FIELD-THEORY; MANGANITES; DISORDER;

D O I：

10.1209/0295-5075/103/57010

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The nature of the ferromagnetic (FM)-paramagnetic (PM) phase transition at T = T-C changes from first order to second order when the average crystallite size, d, falls below 100nm in optimally hole-doped nanocrystalline La1-xCaxMnO3. In zero field, the systems with d < 100 nm behave as a three-dimensional (3D) uniaxial dipolar ferromagnet in the asymptotic critical region but in finite fields, the asymptotic critical behavior changes over to that of a 3D Ising ferromagnet. How effectively polaron correlations couple magnetic degrees of freedom to the lattice decides the order of the FM-PM transition and the magnitude of colossal magnetoresistance (CMR). d alters the electron-lattice coupling and thereby enables the tuning of CMR over an unusually wide temperature range. Copyright (C) EPLA, 2013

引用

页数：6

共 22 条

[1] First-order nature of the ferromagnetic phase transition in (La-Ca)MnO3 near optimal doping -: art. no. 134414 [J].

Adams, CP ;

Lynn, JW ;

Smolyaninova, VN ;

Biswas, A ;

Greene, RL ;

Ratcliff, W ;

Cheong, SW ;

Mukovskii, YM ;

Shulyatev, DA .

PHYSICAL REVIEW B, 2004, 70 (13) :134414-1

[2] Normal-state diamagnetism of charged bosons in cuprate superconductors [J].

Alexandrov, AS .

PHYSICAL REVIEW LETTERS, 2006, 96 (14)

[3] Observation of isotropic-dipolar to isotropic-Heisenberg crossover in Co- and Ni-substituted manganites [J].

Bitla, Yugandhar ;

Kaul, S. N. ;

Barquin, L. Fernandez ;

Gutierrez, J. ;

Barandiaran, J. M. ;

Pena, A. .

NEW JOURNAL OF PHYSICS, 2010, 12

[4] Relevance of cooperative lattice effects and stress fields in phase-separation theories for CMR manganites [J].

Burgy, J ;

Moreo, A ;

Dagotto, E .

PHYSICAL REVIEW LETTERS, 2004, 92 (09) :097202-1

[5] Polaron formation in the optimally doped ferromagnetic manganites La0.7Sr0.3MnO3 and La0.7Ba0.3MnO3 [J].

Chen, Y. ;

Ueland, B. G. ;

Lynn, J. W. ;

Bychkov, G. L. ;

Barilo, S. N. ;

Mukovskii, Y. M. .

PHYSICAL REVIEW B, 2008, 78 (21)

[6] Effect of cation site-disorder on the structure and magneto-transport properties of Ln5/8M3/8MnO3 manganites [J].

Collado, JA ;

Frontera, C ;

García-Muñoz, JL ;

Aranda, MAG .

JOURNAL OF SOLID STATE CHEMISTRY, 2005, 178 (06) :1949-1958

[7] Room temperature structural and microstructural study for the magneto-conducting La5/8-xPrxCa3/8MnO3 (0≤x≤5/8) series [J].

Collado, JA ;

Frontera, C ;

García-Muñoz, JL ;

Ritter, C ;

Brunelli, M ;

Aranda, MAG .

CHEMISTRY OF MATERIALS, 2003, 15 (01) :167-174

[8] Multicritical end point of the first-order ferromagnetic transition in colossal magnetoresistive manganites [J].

Demko, L. ;

Kezsmarki, I. ;

Mihaly, G. ;

Takeshita, N. ;

Tomioka, Y. ;

Tokura, Y. .

PHYSICAL REVIEW LETTERS, 2008, 101 (03)

[9] RENORMALIZED FIELD-THEORY FOR THE STATIC CROSSOVER IN UNIAXIAL DIPOLAR FERROMAGNETS [J].

FREY, E ;

SCHWABL, F .

PHYSICAL REVIEW B, 1990, 42 (13) :8261-8273

[10] DIPOLE-DIPOLE INTERACTIONS AND THE CRITICAL RESISTIVITY OF GADOLINIUM [J].

GELDART, DJW ;

DEBELL, K ;

COOK, J ;

LAUBITZ, MJ .

PHYSICAL REVIEW B, 1987, 35 (16) :8876-8879

← 1 2 3 →