What is the resistivity of copper at 3 kelvin?Do the copper connectors we used in measuring the resistance of...
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What is the resistivity of copper at 3 kelvin?
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I couldn't find the value of resistivity of copper at 2.73K on google
electrical-resistance
asked 9 hours ago
AJKAJK
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I couldn't find the value of resistivity of copper at 2.73K on google
electrical-resistance
asked 9 hours ago
AJKAJK
162 bronze badges
New contributor
AJK is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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add a comment |
$begingroup$
I couldn't find the value of resistivity of copper at 2.73K on google
electrical-resistance
asked 9 hours ago
AJKAJK
162 bronze badges
New contributor
AJK is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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I couldn't find the value of resistivity of copper at 2.73K on google
electrical-resistance
electrical-resistance
asked 9 hours ago
AJKAJK
162 bronze badges
New contributor
AJK is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 9 hours ago
AJKAJK
162 bronze badges
New contributor
AJK is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 9 hours ago
AJKAJK
162 bronze badges
New contributor
AJK is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 9 hours ago
AJKAJK
162 bronze badges
asked 9 hours ago
AJKAJK
162 bronze badges
162 bronze badges
New contributor
AJK is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
AJK is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
There is a problem with answering your question in that at such a low temperature the resistivity of copper is very much determined by the impurities and crystallographic defects eg dislocations, voids etc, which may be present.
At low temperatures it is the scattering of free electrons by impurities and crystallographic defects high determine the resistivity rather than the thermal excitation of the copper ions.
The parameter which is often measured is the residual resistance ratio $dfrac{R_{text{273 K}}}{R_{4.2,rm K}}$ which for fairly pure copper wire as used for telephone lines might be of the order of $100$.
Large single crystals of very pure copper can be produced with residual resistance ratios in the thousands.
.
Update as answers to some of @AJK’s questions.
Annotated graph to illustrate the non-linear logarithmic scale and the resistivity of copper at $3, rm K$.
answered 7 hours ago
FarcherFarcher
55k3 gold badges44 silver badges118 bronze badges
$endgroup$
1
$begingroup$
@AJK That is not what I wrote. From the graph you can get an estimate of the resistivity of “ordinary” copper at around $3,rm K$. At this temperature the copper is a much better conductor of electricity than at room temperature.
$endgroup$
– Farcher
7 hours ago
1
$begingroup$
How do we get the estimate
$endgroup$
– AJK
7 hours ago
1
$begingroup$
@AJK From the graph noting that it is a log-log graph.
$endgroup$
– Farcher
7 hours ago
1
$begingroup$
I have no clue what that means
$endgroup$
– AJK
7 hours ago
1
$begingroup$
@AJK Yes, it is a much better conductor at low temperatures.
$endgroup$
– Farcher
7 hours ago
|
show 3 more comments
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
There is a problem with answering your question in that at such a low temperature the resistivity of copper is very much determined by the impurities and crystallographic defects eg dislocations, voids etc, which may be present.
At low temperatures it is the scattering of free electrons by impurities and crystallographic defects high determine the resistivity rather than the thermal excitation of the copper ions.
The parameter which is often measured is the residual resistance ratio $dfrac{R_{text{273 K}}}{R_{4.2,rm K}}$ which for fairly pure copper wire as used for telephone lines might be of the order of $100$.
Large single crystals of very pure copper can be produced with residual resistance ratios in the thousands.
.
Update as answers to some of @AJK’s questions.
Annotated graph to illustrate the non-linear logarithmic scale and the resistivity of copper at $3, rm K$.
answered 7 hours ago
FarcherFarcher
55k3 gold badges44 silver badges118 bronze badges
$endgroup$
1
$begingroup$
@AJK That is not what I wrote. From the graph you can get an estimate of the resistivity of “ordinary” copper at around $3,rm K$. At this temperature the copper is a much better conductor of electricity than at room temperature.
$endgroup$
– Farcher
7 hours ago
1
$begingroup$
How do we get the estimate
$endgroup$
– AJK
7 hours ago
1
$begingroup$
@AJK From the graph noting that it is a log-log graph.
$endgroup$
– Farcher
7 hours ago
1
$begingroup$
I have no clue what that means
$endgroup$
– AJK
7 hours ago
1
$begingroup$
@AJK Yes, it is a much better conductor at low temperatures.
$endgroup$
– Farcher
7 hours ago
|
show 3 more comments
$begingroup$
There is a problem with answering your question in that at such a low temperature the resistivity of copper is very much determined by the impurities and crystallographic defects eg dislocations, voids etc, which may be present.
At low temperatures it is the scattering of free electrons by impurities and crystallographic defects high determine the resistivity rather than the thermal excitation of the copper ions.
The parameter which is often measured is the residual resistance ratio $dfrac{R_{text{273 K}}}{R_{4.2,rm K}}$ which for fairly pure copper wire as used for telephone lines might be of the order of $100$.
Large single crystals of very pure copper can be produced with residual resistance ratios in the thousands.
.
Update as answers to some of @AJK’s questions.
Annotated graph to illustrate the non-linear logarithmic scale and the resistivity of copper at $3, rm K$.
answered 7 hours ago
FarcherFarcher
55k3 gold badges44 silver badges118 bronze badges
$endgroup$
1
$begingroup$
@AJK That is not what I wrote. From the graph you can get an estimate of the resistivity of “ordinary” copper at around $3,rm K$. At this temperature the copper is a much better conductor of electricity than at room temperature.
$endgroup$
– Farcher
7 hours ago
1
$begingroup$
How do we get the estimate
$endgroup$
– AJK
7 hours ago
1
$begingroup$
@AJK From the graph noting that it is a log-log graph.
$endgroup$
– Farcher
7 hours ago
1
$begingroup$
I have no clue what that means
$endgroup$
– AJK
7 hours ago
1
$begingroup$
@AJK Yes, it is a much better conductor at low temperatures.
$endgroup$
– Farcher
7 hours ago
|
show 3 more comments
$begingroup$
There is a problem with answering your question in that at such a low temperature the resistivity of copper is very much determined by the impurities and crystallographic defects eg dislocations, voids etc, which may be present.
At low temperatures it is the scattering of free electrons by impurities and crystallographic defects high determine the resistivity rather than the thermal excitation of the copper ions.
The parameter which is often measured is the residual resistance ratio $dfrac{R_{text{273 K}}}{R_{4.2,rm K}}$ which for fairly pure copper wire as used for telephone lines might be of the order of $100$.
Large single crystals of very pure copper can be produced with residual resistance ratios in the thousands.
.
Update as answers to some of @AJK’s questions.
Annotated graph to illustrate the non-linear logarithmic scale and the resistivity of copper at $3, rm K$.
answered 7 hours ago
FarcherFarcher
55k3 gold badges44 silver badges118 bronze badges
$endgroup$
There is a problem with answering your question in that at such a low temperature the resistivity of copper is very much determined by the impurities and crystallographic defects eg dislocations, voids etc, which may be present.
At low temperatures it is the scattering of free electrons by impurities and crystallographic defects high determine the resistivity rather than the thermal excitation of the copper ions.
The parameter which is often measured is the residual resistance ratio $dfrac{R_{text{273 K}}}{R_{4.2,rm K}}$ which for fairly pure copper wire as used for telephone lines might be of the order of $100$.
Large single crystals of very pure copper can be produced with residual resistance ratios in the thousands.
.
Update as answers to some of @AJK’s questions.
Annotated graph to illustrate the non-linear logarithmic scale and the resistivity of copper at $3, rm K$.
answered 7 hours ago
FarcherFarcher
55k3 gold badges44 silver badges118 bronze badges
edited 7 hours ago
answered 7 hours ago
FarcherFarcher
55k3 gold badges44 silver badges118 bronze badges
answered 7 hours ago
FarcherFarcher
55k3 gold badges44 silver badges118 bronze badges
answered 7 hours ago
FarcherFarcher
55k3 gold badges44 silver badges118 bronze badges
55k3 gold badges44 silver badges118 bronze badges
1
$begingroup$
@AJK That is not what I wrote. From the graph you can get an estimate of the resistivity of “ordinary” copper at around $3,rm K$. At this temperature the copper is a much better conductor of electricity than at room temperature.
$endgroup$
– Farcher
7 hours ago
1
$begingroup$
How do we get the estimate
$endgroup$
– AJK
7 hours ago
1
$begingroup$
@AJK From the graph noting that it is a log-log graph.
$endgroup$
– Farcher
7 hours ago
1
$begingroup$
I have no clue what that means
$endgroup$
– AJK
7 hours ago
1
$begingroup$
@AJK Yes, it is a much better conductor at low temperatures.
$endgroup$
– Farcher
7 hours ago
|
show 3 more comments
1
$begingroup$
@AJK That is not what I wrote. From the graph you can get an estimate of the resistivity of “ordinary” copper at around $3,rm K$. At this temperature the copper is a much better conductor of electricity than at room temperature.
$endgroup$
– Farcher
7 hours ago
1
$begingroup$
How do we get the estimate
$endgroup$
– AJK
7 hours ago
1
$begingroup$
@AJK From the graph noting that it is a log-log graph.
$endgroup$
– Farcher
7 hours ago
1
$begingroup$
I have no clue what that means
$endgroup$
– AJK
7 hours ago
1
$begingroup$
@AJK Yes, it is a much better conductor at low temperatures.
$endgroup$
– Farcher
7 hours ago
1
1
$begingroup$
@AJK That is not what I wrote. From the graph you can get an estimate of the resistivity of “ordinary” copper at around $3,rm K$. At this temperature the copper is a much better conductor of electricity than at room temperature.
$endgroup$
– Farcher
7 hours ago
$begingroup$
@AJK That is not what I wrote. From the graph you can get an estimate of the resistivity of “ordinary” copper at around $3,rm K$. At this temperature the copper is a much better conductor of electricity than at room temperature.
$endgroup$
– Farcher
7 hours ago
1
1
$begingroup$
How do we get the estimate
$endgroup$
– AJK
7 hours ago
$begingroup$
How do we get the estimate
$endgroup$
– AJK
7 hours ago
1
1
$begingroup$
@AJK From the graph noting that it is a log-log graph.
$endgroup$
– Farcher
7 hours ago
$begingroup$
@AJK From the graph noting that it is a log-log graph.
$endgroup$
– Farcher
7 hours ago
1
1
$begingroup$
I have no clue what that means
$endgroup$
– AJK
7 hours ago
$begingroup$
I have no clue what that means
$endgroup$
– AJK
7 hours ago
1
1
$begingroup$
@AJK Yes, it is a much better conductor at low temperatures.
$endgroup$
– Farcher
7 hours ago
$begingroup$
@AJK Yes, it is a much better conductor at low temperatures.
$endgroup$
– Farcher
7 hours ago
|
show 3 more comments
AJK is a new contributor. Be nice, and check out our Code of Conduct.
AJK is a new contributor. Be nice, and check out our Code of Conduct.
AJK is a new contributor. Be nice, and check out our Code of Conduct.
AJK is a new contributor. Be nice, and check out our Code of Conduct.
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