Pressure-induced changes in transport properties of layered La1.2Ca1.8Mn2O7

K V  Kamenev; M R  Lees; G  Balakrishnan; D M  Paul

Pressure-induced changes in transport properties of layered La_1.2Ca_1.8Mn₂O₇

K V Kamenev, M R Lees, G Balakrishnan, D M Paul

School of Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

The transport properties of a single crystal of La1.2Ca1.8Mn2O7 with the layered Sr3Ti2O7-type perovskite structure have been studied under hydrostatic pressures of up to similar to 9 kbar. It is found that La1.2Ca1.8Mn2O7 undergoes a first-order phase transition from a paramagnetic insulating to a low-temperature ferromagnetic metallic state which is accompanied by a large decrease in the electrical resistivity. At ambient pressure the magnetic phase transition takes place at T-c=242 K and as the external pressure is applied the critical temperature increases Linearly at a rate of 1.1 K/kbar. The present results reflect the competition between double and superexchange resulting from two-dimensional Mn-O-Mn networks and can be interpreted in terms of the exchange striction model.

Original language	English
Pages (from-to)	12688-12690
Number of pages	3
Journal	Physical review B
Volume	56
Issue number	20
Publication status	Published - 15 Nov 1997

Keywords / Materials (for Non-textual outputs)

LOW-TEMPERATURE MAGNETORESISTANCE
GIANT MAGNETORESISTANCE
MANGANESE OXIDES
MANGANATES

Cite this

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title = "Pressure-induced changes in transport properties of layered La1.2Ca1.8Mn2O7",

abstract = "The transport properties of a single crystal of La1.2Ca1.8Mn2O7 with the layered Sr3Ti2O7-type perovskite structure have been studied under hydrostatic pressures of up to similar to 9 kbar. It is found that La1.2Ca1.8Mn2O7 undergoes a first-order phase transition from a paramagnetic insulating to a low-temperature ferromagnetic metallic state which is accompanied by a large decrease in the electrical resistivity. At ambient pressure the magnetic phase transition takes place at T-c=242 K and as the external pressure is applied the critical temperature increases Linearly at a rate of 1.1 K/kbar. The present results reflect the competition between double and superexchange resulting from two-dimensional Mn-O-Mn networks and can be interpreted in terms of the exchange striction model.",

keywords = "LOW-TEMPERATURE MAGNETORESISTANCE, GIANT MAGNETORESISTANCE, MANGANESE OXIDES, MANGANATES",

author = "Kamenev, {K V} and Lees, {M R} and G Balakrishnan and Paul, {D M}",

year = "1997",

month = nov,

day = "15",

language = "English",

volume = "56",

pages = "12688--12690",

journal = "Physical review B",

issn = "1098-0121",

publisher = "American Physical Society",

number = "20",

}

TY - JOUR

T1 - Pressure-induced changes in transport properties of layered La1.2Ca1.8Mn2O7

AU - Kamenev, K V

AU - Lees, M R

AU - Balakrishnan, G

AU - Paul, D M

PY - 1997/11/15

Y1 - 1997/11/15

N2 - The transport properties of a single crystal of La1.2Ca1.8Mn2O7 with the layered Sr3Ti2O7-type perovskite structure have been studied under hydrostatic pressures of up to similar to 9 kbar. It is found that La1.2Ca1.8Mn2O7 undergoes a first-order phase transition from a paramagnetic insulating to a low-temperature ferromagnetic metallic state which is accompanied by a large decrease in the electrical resistivity. At ambient pressure the magnetic phase transition takes place at T-c=242 K and as the external pressure is applied the critical temperature increases Linearly at a rate of 1.1 K/kbar. The present results reflect the competition between double and superexchange resulting from two-dimensional Mn-O-Mn networks and can be interpreted in terms of the exchange striction model.

AB - The transport properties of a single crystal of La1.2Ca1.8Mn2O7 with the layered Sr3Ti2O7-type perovskite structure have been studied under hydrostatic pressures of up to similar to 9 kbar. It is found that La1.2Ca1.8Mn2O7 undergoes a first-order phase transition from a paramagnetic insulating to a low-temperature ferromagnetic metallic state which is accompanied by a large decrease in the electrical resistivity. At ambient pressure the magnetic phase transition takes place at T-c=242 K and as the external pressure is applied the critical temperature increases Linearly at a rate of 1.1 K/kbar. The present results reflect the competition between double and superexchange resulting from two-dimensional Mn-O-Mn networks and can be interpreted in terms of the exchange striction model.

KW - LOW-TEMPERATURE MAGNETORESISTANCE

KW - GIANT MAGNETORESISTANCE

KW - MANGANESE OXIDES

KW - MANGANATES

M3 - Article

SN - 1098-0121

VL - 56

SP - 12688

EP - 12690

JO - Physical review B

JF - Physical review B

IS - 20

ER -

Pressure-induced changes in transport properties of layered La1.2Ca1.8Mn2O7

Abstract

Keywords / Materials (for Non-textual outputs)

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Pressure-induced changes in transport properties of layered La_1.2Ca_1.8Mn₂O₇