Temperature and field dependence of resistivities and anisotropy of layered manganites la2-2xSr1+2xMn2O7

C. C. Almasan; C. L. Zhang; G. A. Levin; J. S. Gardner

doi:10.1016/S0921-4534(00)00695-X

Temperature and field dependence of resistivities and anisotropy of layered manganites la_2-2xSr_1+2xMn₂O₇

C. C. Almasan, C. L. Zhang, G. A. Levin, J. S. Gardner

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Abstract

In-plane ρ_aband out-of-plane ρ_c resistivities of La_1.2Sr_1.8Mn₂O₇ and LaSr₂Mn₂O₇ have been measured by a multiterminal technique. We focus on the effects that magnetic and charge ordering transitions have on the anisotropy σ_ab/σ_c which reflects the ratio of the phase coherence lengths in the respective directions. Both resistivities of La_1.2Sr_1.8Mn₂O₇ decrease dramatically below the Curie temperature TC ≈ 135 K. Anisotropy changes with temperature nonmonotonically and displays a peak close to T_C. In LaSr₂Mn₂O₇, ρ_c and ρ_ab display a broad peak close to the paramagnetic-antiferromagnetic transition temperature T_N ≈165 K. The anisotropy exhibits an even more complex behavior than in La_1.2Sr_1.8Mn₂O₇, displaying a maximum at the charge ordering temperature and a minimum at T_N.

Original language	English
Pages (from-to)	791-792
Number of pages	2
Journal	Physica C: Superconductivity and its Applications
Volume	341-348
Issue number	PART 3
DOIs	https://doi.org/10.1016/S0921-4534(00)00695-X
State	Published - 2000
Externally published	Yes

Funding

There is currently a great deal of interest in understanding the relationship between conduction and spin ordering transitions in layered manganites. Here we concentrate on the effects of the phase transitions on the resistive anisotropy of the 40 and 50% doped La2-2xSrl+2xMn207. The importance of studying the anisotropy in layered crystals, such as superconducting cuprates, have been recently discussed \[1\]. The anisotropy (Tab~t7c is of fundamental importance because it reflects the ratio of the phase coherence lengths l~,ab and £v,e in the aband c-direction, respectively; namely O'ab/ae = e~2, ~b/ev, 2 c. The resistive anisotropy and each component of the resistivity tensor of Lal.2Srl.sMn207 and LaSr2Mn207 single crystals were measured as a function of temperature T and magnetic field H by a multiterminal method \[2\]. The 40% doped Lal.2Srz.sMn207 undergoes a Curie transition at Tc ~ 135 K. Below Tc, both Pab and Pe drop by two orders of magnitude within a T range of 10 - 20 K. Here we present the data showing the effect of this phase transition on the anisotropy Pc/Pab. Figure 1 shows the T dependence of Pe/Pab for several values of HIIc. The anisotropy is strongly T dependent *The work at KSU was supported by the National Science Foundation under Grant No. DMR-9801990

Funders	Funder number
National Science Foundation	DMR-9801990

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title = "Temperature and field dependence of resistivities and anisotropy of layered manganites la2-2xSr1+2xMn2O7",

abstract = "In-plane ρaband out-of-plane ρc resistivities of La1.2Sr1.8Mn2O7 and LaSr2Mn2O7 have been measured by a multiterminal technique. We focus on the effects that magnetic and charge ordering transitions have on the anisotropy σab/σc which reflects the ratio of the phase coherence lengths in the respective directions. Both resistivities of La1.2Sr1.8Mn2O7 decrease dramatically below the Curie temperature TC ≈ 135 K. Anisotropy changes with temperature nonmonotonically and displays a peak close to TC. In LaSr2Mn2O7, ρc and ρab display a broad peak close to the paramagnetic-antiferromagnetic transition temperature TN ≈165 K. The anisotropy exhibits an even more complex behavior than in La1.2Sr1.8Mn2O7, displaying a maximum at the charge ordering temperature and a minimum at TN.",

author = "Almasan, {C. C.} and Zhang, {C. L.} and Levin, {G. A.} and Gardner, {J. S.}",

year = "2000",

doi = "10.1016/S0921-4534(00)00695-X",

language = "English",

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journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

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TY - JOUR

T1 - Temperature and field dependence of resistivities and anisotropy of layered manganites la2-2xSr1+2xMn2O7

AU - Almasan, C. C.

AU - Zhang, C. L.

AU - Levin, G. A.

AU - Gardner, J. S.

PY - 2000

Y1 - 2000

N2 - In-plane ρaband out-of-plane ρc resistivities of La1.2Sr1.8Mn2O7 and LaSr2Mn2O7 have been measured by a multiterminal technique. We focus on the effects that magnetic and charge ordering transitions have on the anisotropy σab/σc which reflects the ratio of the phase coherence lengths in the respective directions. Both resistivities of La1.2Sr1.8Mn2O7 decrease dramatically below the Curie temperature TC ≈ 135 K. Anisotropy changes with temperature nonmonotonically and displays a peak close to TC. In LaSr2Mn2O7, ρc and ρab display a broad peak close to the paramagnetic-antiferromagnetic transition temperature TN ≈165 K. The anisotropy exhibits an even more complex behavior than in La1.2Sr1.8Mn2O7, displaying a maximum at the charge ordering temperature and a minimum at TN.

AB - In-plane ρaband out-of-plane ρc resistivities of La1.2Sr1.8Mn2O7 and LaSr2Mn2O7 have been measured by a multiterminal technique. We focus on the effects that magnetic and charge ordering transitions have on the anisotropy σab/σc which reflects the ratio of the phase coherence lengths in the respective directions. Both resistivities of La1.2Sr1.8Mn2O7 decrease dramatically below the Curie temperature TC ≈ 135 K. Anisotropy changes with temperature nonmonotonically and displays a peak close to TC. In LaSr2Mn2O7, ρc and ρab display a broad peak close to the paramagnetic-antiferromagnetic transition temperature TN ≈165 K. The anisotropy exhibits an even more complex behavior than in La1.2Sr1.8Mn2O7, displaying a maximum at the charge ordering temperature and a minimum at TN.

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U2 - 10.1016/S0921-4534(00)00695-X

DO - 10.1016/S0921-4534(00)00695-X

M3 - Article

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SN - 0921-4534

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IS - PART 3

ER -

Temperature and field dependence of resistivities and anisotropy of layered manganites la_2-2xSr_1+2xMn₂O₇

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