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Pressure driven magnetic order in Sr$$_{1-x}$$Ca$$_x$$Co$$_2$$P$$_2
The magnetic phase diagram of Sr $$_{1-x}$$ 1 - x Ca $$_x$$ x Co $$_2$$ 2 P $$_2$$ 2 as a function of hydrostatic pressure and temperature is investigated by means of high pressure muon spin rotation, relaxation and resonance ( $$\mu ^+$$ μ + SR). The weak pressure dependence for the $$x\ne 1$$ x ≠...
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Published in: | Scientific reports 2022-10, Vol.12 (1), Article 17526 |
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Main Authors: | , , , , , , , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The magnetic phase diagram of Sr
$$_{1-x}$$
1
-
x
Ca
$$_x$$
x
Co
$$_2$$
2
P
$$_2$$
2
as a function of hydrostatic pressure and temperature is investigated by means of high pressure muon spin rotation, relaxation and resonance (
$$\mu ^+$$
μ
+
SR). The weak pressure dependence for the
$$x\ne 1$$
x
≠
1
compounds suggests that the rich phase diagram of Sr
$$_{1-x}$$
1
-
x
Ca
$$_x$$
x
Co
$$_2$$
2
P
$$_2$$
2
as a function of
x
at ambient pressure may not solely be attributed to chemical pressure effects. The
$$x=1$$
x
=
1
compound on the other hand reveals a high pressure dependence, where the long range magnetic order is fully suppressed at
$$p_{\rm{c2}}\approx 9.8$$
p
c
2
≈
9.8
kbar, which seem to be a first order transition. In addition, an intermediate phase consisting of magnetic domains is formed above
$$p_{\rm{c1}}\approx 8$$
p
c
1
≈
8
kbar where they co-exist with a magnetically disordered state. These domains are likely to be ferromagnetic islands (FMI) and consist of an high- (FMI-
$$\textcircled {1}$$
1
) and low-temperature (FMI-
$$\textcircled {2}$$
2
) region, respectively, separated by a phase boundary at
$$T_{\rm{i}}\approx 20$$
T
i
≈
20
K. This kind of co-existence is unusual and is originating from a coupling between lattice and magnetic degrees of freedoms. |
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ISSN: | 2045-2322 2045-2322 |
DOI: | 10.1038/s41598-022-21699-y |