Abstract
Previous measurements on TmSe, which appears to be an intermediate valence compound, have indicated an ordered state occurs below 3 K characterized by magnetostriction and magnetization anomalies (1,2) at “critical” magnetic fields of ~2 and ~5 kOe. Even above 3 K weak anomalies in magnetostriction (2) and magnetization (3) are observed at higher magnetic fields. The magnetic anomalies have recently been shown to be very pressure sensitive, the upper critical field increasing rapidly versus pressure. (3) We had performed microwave and radiofrequency surface resistance experiments which indicated a large decrease in electrical resistance at the upper critical field. Subsequent D.C. resistance measurements in this laboratory and elsewhere have confirmed that the resistivity decreases strongly (×10–1-10–2) at the upper critical field. (4)
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