Answer:

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Explanation:

The nuclear and magnetic structures and properties of

La

1

−

x

Sr

x

MnO

3

with

0.45

<~

x

<~

1

and

Pr

1

−

y

Sr

y

MnO

3

(

0.58

<~

y

<~

1

)

were investigated using neutron powder diffraction, resistivity and magnetic measurements. In this paper, we present the full magnetic and structural phase diagram for

La

1

−

x

Sr

x

MnO

3

and a partial phase diagram for

Pr

1

−

y

Sr

y

MnO

3

.

At low temperatures, we observe a series of structural phase transitions evolving as a function of increasing x as follows: orthorhombic

Pbn

→

m

rhombohedral

R

3

¯

→

c

orthorhombic

Fmm

→

m

tetragonal

I

4

if/

m

c

→

m

cubic

Pm

3

¯

m

.

At higher temperatures, the orthorhombic Fmmm structural region disappears. We also identify four magnetic states (FM, A, C, and G type) evolving as a function of increasing x. The magnetic and nuclear structural transitions coincide for samples with

0.8

<~

x

<~

0.95.

In the

0.5

<~

x

<~

0.9

region, resistivity and magnetic measurements show a substantial hysteresis near

T

N

.

This hysteresis of a few K is indicative of a first order antiferromagnetic transition in good agreement with the neutron diffraction results. Our data also suggest the existence of a strong competition between the ferromagnetic and A-type states for

x

∼

0

.

5

,

and between the C- and G-type states for

x

∼

0.95.

A similar behavior is observed for

Pr

1

−

y

Sr

y

MnO

3

.

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Explanation:

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